Warning: Cannot modify header information – headers already sent by

20. 9. 2013 02:42:34

Upravovala jsem jednu WP šablonu a pokud si dobře vzpomínám, tak jsem chtěla odinstalovat plugin HelloDolly a od té doby se mi už nedaří přihlásit do WP...

na loginovací stránce to hlásí tohle (stránka xyz.cz je fiktivní)

Vyplnit uživatelské jméno a heslo se mi podaří, ale administrace WP už nenaběne, místo toho je tam toto:

Warning: Cannot modify header information - headers already sent by (output started at /www/doc/www.xyz.cz/www/wp-content/themes/trantina/functions.php:1) in /www/doc/www.xyz.cz/www/wp-login.php on line 384

Neměl byste někdo nápad, co s tím? koukám na to už asi hodinu a řešení nevidím, mezera někde před

20. 9. 2013 02:42:34

https://webtrh.cz/diskuse/warning-cannot-modify-header-information-headers-already-sent-by/#reply946749

Jan Horák (Gransy)

(22 hodnocení)

20. 9. 2013 02:45:39

/www/doc/www.xyz.cz/www/wp-content/themes/trantina/functions.php v tomhle souboru na radku 1 ti mozna zustal nejaky "bily" znak, nebo ses tam upsala, a nebo umazla neco z

20. 9. 2013 02:45:39

https://webtrh.cz/diskuse/warning-cannot-modify-header-information-headers-already-sent-by/#reply946748

Majox

(17 hodnocení)

20. 9. 2013 02:48:12

Možno pomôže nejaká rada z týchto:

http://wordpress.org/support/topic/updated-to-36-and-now-have-a-header-error

tiež tam rieši obdobný problém užívateľ DinaG

20. 9. 2013 02:48:12

https://webtrh.cz/diskuse/warning-cannot-modify-header-information-headers-already-sent-by/#reply946747

kybernaut.cz

(12 hodnocení)

20. 9. 2013 04:40:52

Díky Vám oběma, evidentně tam byl někde bílý znak (a to jsem si myslela, že jsem to s pspadem řešila dost podrobně), ale pomohlo až překopírování obsahu do nového souboru, protože jsem nebyla schopna fyzicky žádný bílý znak najít.

20. 9. 2013 04:40:52

https://webtrh.cz/diskuse/warning-cannot-modify-header-information-headers-already-sent-by/#reply946746

tomve

(22 hodnocení)

20. 9. 2013 04:48:03

na pspad se vykašly, mrkni na netbeans

20. 9. 2013 04:48:03

https://webtrh.cz/diskuse/warning-cannot-modify-header-information-headers-already-sent-by/#reply946745

Lukenzi

20. 9. 2013 09:48:39

Napsal Tomve;1000651
na pspad se vykašly, mrkni na netbeans

K čemu ji to bude?

20. 9. 2013 09:48:39

https://webtrh.cz/diskuse/warning-cannot-modify-header-information-headers-already-sent-by/#reply946744

Jan Horák (Gransy)

(22 hodnocení)

20. 9. 2013 09:50:53

Napsal Lukenzi;1000695
K čemu ji to bude?

Nejde mi zavolat z telefonu .... Na telefon se vykasly, porid si telefonni ustrednu!

20. 9. 2013 09:50:53

https://webtrh.cz/diskuse/warning-cannot-modify-header-information-headers-already-sent-by/#reply946743

Adam Žurek

(5 hodnocení)

20. 9. 2013 12:39:37

Napsal Karolína Vyskočilová;1000650
Díky Vám oběma, evidentně tam byl někde bílý znak (a to jsem si myslela, že jsem to s pspadem řešila dost podrobně), ale pomohlo až překopírování obsahu do nového souboru, protože jsem nebyla schopna fyzicky žádný bílý znak najít.

neumí třeba pspad zobrazit netisknutelné znaky?

20. 9. 2013 12:39:37

https://webtrh.cz/diskuse/warning-cannot-modify-header-information-headers-already-sent-by/#reply946742

Lukáš Hovorka

(10 hodnocení)

28. 12. 2014 23:01:02

Zdravím,

mám asi stejný problém, ale nejsem zběhlý ve skriptech. Můžete mi jako lajkovi poradit, co s tím?

Soubor v reálu vypadá takto:

<?php
 
/**
 * Option API
 *
 * @package WordPress
 * @subpackage Option
 */
 
/**
 * Retrieve option value based on name of option.
 *
 * If the option does not exist or does not have a value, then the return value
 * will be false. This is useful to check whether you need to install an option
 * and is commonly used during installation of plugin options and to test
 * whether upgrading is required.
 *
 * If the option was serialized then it will be unserialized when it is returned.
 *
 * @since 1.5.0
 *
 * @param string $option Name of option to retrieve. Expected to not be SQL-escaped.
 * @param mixed $default Optional. Default value to return if the option does not exist.
 * @return mixed Value set for the option.
 */
function get_option( $option, $default = false ) {
	global $wpdb;
 
	$option = trim( $option );
	if ( empty( $option ) )
		return false;
 
	/**
	 * Filter the value of an existing option before it is retrieved.
	 *
	 * The dynamic portion of the hook name, $option, refers to the option name.
	 *
	 * Passing a truthy value to the filter will short-circuit retrieving
	 * the option value, returning the passed value instead.
	 *
	 * @since 1.5.0
	 *
	 * @param bool|mixed $pre_option Value to return instead of the option value.
	 *                               Default false to skip it.
	 */
	$pre = apply_filters( 'pre_option_' . $option, false );
	if ( false !== $pre )
		return $pre;
 
	if ( defined( 'WP_SETUP_CONFIG' ) )
		return false;
 
	if ( ! defined( 'WP_INSTALLING' ) ) {
		// prevent non-existent options from triggering multiple queries
		$notoptions = wp_cache_get( 'notoptions', 'options' );
		if ( isset( $notoptions ) )
 
			/**
			 * Filter the default value for an option.
			 *
			 * The dynamic portion of the hook name, $option, refers
			 * to the option name.
			 *
			 * @since 3.4.0
			 *
			 * @param mixed $default The default value to return if the option
			 *                       does not exist in the database.
			 */
			return apply_filters( 'default_option_' . $option, $default );
 
		$alloptions = wp_load_alloptions();
 
		if ( isset( $alloptions ) ) {
			$value = $alloptions;
		} else {
			$value = wp_cache_get( $option, 'options' );
 
			if ( false === $value ) {
				$row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $option ) );
 
				// Has to be get_row instead of get_var because of funkiness with 0, false, null values
				if ( is_object( $row ) ) {
					$value = $row->option_value;
					wp_cache_add( $option, $value, 'options' );
				} else { // option does not exist, so we must cache its non-existence
					$notoptions = true;
					wp_cache_set( 'notoptions', $notoptions, 'options' );
 
					/** This filter is documented in wp-includes/option.php */
					return apply_filters( 'default_option_' . $option, $default );
				}
			}
		}
	} else {
		$suppress = $wpdb->suppress_errors();
		$row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $option ) );
		$wpdb->suppress_errors( $suppress );
		if ( is_object( $row ) ) {
			$value = $row->option_value;
		} else {
			/** This filter is documented in wp-includes/option.php */
			return apply_filters( 'default_option_' . $option, $default );
		}
	}
 
	// If home is not set use siteurl.
	if ( 'home' == $option && '' == $value )
		return get_option( 'siteurl' );
 
	if ( in_array( $option, array('siteurl', 'home', 'category_base', 'tag_base') ) )
		$value = untrailingslashit( $value );
 
	/**
	 * Filter the value of an existing option.
	 *
	 * The dynamic portion of the hook name, $option, refers to the option name.
	 *
	 * @since 1.5.0 As 'option_' . $setting
	 * @since 3.0.0
	 *
	 * @param mixed $value Value of the option. If stored serialized, it will be
	 *                     unserialized prior to being returned.
	 */
	return apply_filters( 'option_' . $option, maybe_unserialize( $value ) );
}
 
/**
 * Protect WordPress special option from being modified.
 *
 * Will die if $option is in protected list. Protected options are 'alloptions'
 * and 'notoptions' options.
 *
 * @since 2.2.0
 *
 * @param string $option Option name.
 */
function wp_protect_special_option( $option ) {
	if ( 'alloptions' === $option || 'notoptions' === $option )
		wp_die( sprintf( __( '%s is a protected WP option and may not be modified' ), esc_html( $option ) ) );
}
 
/**
 * Print option value after sanitizing for forms.
 *
 * @uses attr Sanitizes value.
 * @since 1.5.0
 *
 * @param string $option Option name.
 */
function form_option( $option ) {
	echo esc_attr( get_option( $option ) );
}
 
/**
 * Loads and caches all autoloaded options, if available or all options.
 *
 * @since 2.2.0
 *
 * @return array List of all options.
 */
function wp_load_alloptions() {
	global $wpdb;
 
	if ( !defined( 'WP_INSTALLING' ) || !is_multisite() )
		$alloptions = wp_cache_get( 'alloptions', 'options' );
	else
		$alloptions = false;
 
	if ( !$alloptions ) {
		$suppress = $wpdb->suppress_errors();
		if ( !$alloptions_db = $wpdb->get_results( "SELECT option_name, option_value FROM $wpdb->options WHERE autoload = 'yes'" ) )
			$alloptions_db = $wpdb->get_results( "SELECT option_name, option_value FROM $wpdb->options" );
		$wpdb->suppress_errors($suppress);
		$alloptions = array();
		foreach ( (array) $alloptions_db as $o ) {
			$alloptions = $o->option_value;
		}
		if ( !defined( 'WP_INSTALLING' ) || !is_multisite() )
			wp_cache_add( 'alloptions', $alloptions, 'options' );
	}
 
	return $alloptions;
}
 
/**
 * Loads and caches certain often requested site options if is_multisite() and a persistent cache is not being used.
 *
 * @since 3.0.0
 *
 * @param int $site_id Optional site ID for which to query the options. Defaults to the current site.
 */
function wp_load_core_site_options( $site_id = null ) {
	global $wpdb;
 
	if ( !is_multisite() || wp_using_ext_object_cache() || defined( 'WP_INSTALLING' ) )
		return;
 
	if ( empty($site_id) )
		$site_id = $wpdb->siteid;
 
	$core_options = array('site_name', 'siteurl', 'active_sitewide_plugins', '_site_transient_timeout_theme_roots', '_site_transient_theme_roots', 'site_admins', 'can_compress_scripts', 'global_terms_enabled', 'ms_files_rewriting' );
 
	$core_options_in = "'" . implode("', '", $core_options) . "'";
	$options = $wpdb->get_results( $wpdb->prepare("SELECT meta_key, meta_value FROM $wpdb->sitemeta WHERE meta_key IN ($core_options_in) AND site_id = %d", $site_id) );
 
	foreach ( $options as $option ) {
		$key = $option->meta_key;
		$cache_key = "{$site_id}:$key";
		$option->meta_value = maybe_unserialize( $option->meta_value );
 
		wp_cache_set( $cache_key, $option->meta_value, 'site-options' );
	}
}
 
/**
 * Update the value of an option that was already added.
 *
 * You do not need to serialize values. If the value needs to be serialized, then
 * it will be serialized before it is inserted into the database. Remember,
 * resources can not be serialized or added as an option.
 *
 * If the option does not exist, then the option will be added with the option
 * value, but you will not be able to set whether it is autoloaded. If you want
 * to set whether an option is autoloaded, then you need to use the add_option().
 *
 * @since 1.0.0
 *
 * @param string $option Option name. Expected to not be SQL-escaped.
 * @param mixed $value Option value. Must be serializable if non-scalar. Expected to not be SQL-escaped.
 * @return bool False if value was not updated and true if value was updated.
 */
function update_option( $option, $value ) {
	global $wpdb;
 
	$option = trim($option);
	if ( empty($option) )
		return false;
 
	wp_protect_special_option( $option );
 
	if ( is_object( $value ) )
		$value = clone $value;
 
	$value = sanitize_option( $option, $value );
	$old_value = get_option( $option );
 
	/**
	 * Filter a specific option before its value is (maybe) serialized and updated.
	 *
	 * The dynamic portion of the hook name, $option, refers to the option name.
	 *
	 * @since 2.6.0
	 *
	 * @param mixed $value     The new, unserialized option value.
	 * @param mixed $old_value The old option value.
	 */
	$value = apply_filters( 'pre_update_option_' . $option, $value, $old_value );
 
	/**
	 * Filter an option before its value is (maybe) serialized and updated.
	 *
	 * @since 3.9.0
	 *
	 * @param mixed  $value     The new, unserialized option value.
	 * @param string $option    Name of the option.
	 * @param mixed  $old_value The old option value.
	 */
	$value = apply_filters( 'pre_update_option', $value, $option, $old_value );
 
	// If the new and old values are the same, no need to update.
	if ( $value === $old_value )
		return false;
 
	if ( false === $old_value )
		return add_option( $option, $value );
 
	$serialized_value = maybe_serialize( $value );
 
	/**
	 * Fires immediately before an option value is updated.
	 *
	 * @since 2.9.0
	 *
	 * @param string $option    Name of the option to update.
	 * @param mixed  $old_value The old option value.
	 * @param mixed  $value     The new option value.
	 */
	do_action( 'update_option', $option, $old_value, $value );
 
	$result = $wpdb->update( $wpdb->options, array( 'option_value' => $serialized_value ), array( 'option_name' => $option ) );
	if ( ! $result )
		return false;
 
	$notoptions = wp_cache_get( 'notoptions', 'options' );
	if ( is_array( $notoptions ) && isset( $notoptions ) ) {
		unset( $notoptions );
		wp_cache_set( 'notoptions', $notoptions, 'options' );
	}
 
	if ( ! defined( 'WP_INSTALLING' ) ) {
		$alloptions = wp_load_alloptions();
		if ( isset( $alloptions ) ) {
			$alloptions = $serialized_value;
			wp_cache_set( 'alloptions', $alloptions, 'options' );
		} else {
			wp_cache_set( $option, $serialized_value, 'options' );
		}
	}
 
	/**
	 * Fires after the value of a specific option has been successfully updated.
	 *
	 * The dynamic portion of the hook name, $option, refers to the option name.
	 *
	 * @since 2.0.1
	 *
	 * @param mixed $old_value The old option value.
	 * @param mixed $value     The new option value.
	 */
	do_action( "update_option_{$option}", $old_value, $value );
 
	/**
	 * Fires after the value of an option has been successfully updated.
	 *
	 * @since 2.9.0
	 *
	 * @param string $option    Name of the updated option.
	 * @param mixed  $old_value The old option value.
	 * @param mixed  $value     The new option value.
	 */
	do_action( 'updated_option', $option, $old_value, $value );
	return true;
}
 
/**
 * Add a new option.
 *
 * You do not need to serialize values. If the value needs to be serialized, then
 * it will be serialized before it is inserted into the database. Remember,
 * resources can not be serialized or added as an option.
 *
 * You can create options without values and then update the values later.
 * Existing options will not be updated and checks are performed to ensure that you
 * aren't adding a protected WordPress option. Care should be taken to not name
 * options the same as the ones which are protected.
 *
 * @since 1.0.0
 *
 * @param string $option Name of option to add. Expected to not be SQL-escaped.
 * @param mixed $value Optional. Option value. Must be serializable if non-scalar. Expected to not be SQL-escaped.
 * @param mixed $deprecated Optional. Description. Not used anymore.
 * @param bool $autoload Optional. Default is enabled. Whether to load the option when WordPress starts up.
 * @return bool False if option was not added and true if option was added.
 */
function add_option( $option, $value = '', $deprecated = '', $autoload = 'yes' ) {
	global $wpdb;
 
	if ( !empty( $deprecated ) )
		_deprecated_argument( __FUNCTION__, '2.3' );
 
	$option = trim($option);
	if ( empty($option) )
		return false;
 
	wp_protect_special_option( $option );
 
	if ( is_object($value) )
		$value = clone $value;
 
	$value = sanitize_option( $option, $value );
 
	// Make sure the option doesn't already exist. We can check the 'notoptions' cache before we ask for a db query
	$notoptions = wp_cache_get( 'notoptions', 'options' );
	if ( !is_array( $notoptions ) || !isset( $notoptions ) )
		if ( false !== get_option( $option ) )
			return false;
 
	$serialized_value = maybe_serialize( $value );
	$autoload = ( 'no' === $autoload ) ? 'no' : 'yes';
 
	/**
	 * Fires before an option is added.
	 *
	 * @since 2.9.0
	 *
	 * @param string $option Name of the option to add.
	 * @param mixed  $value  Value of the option.
	 */
	do_action( 'add_option', $option, $value );
 
	$result = $wpdb->query( $wpdb->prepare( "INSERT INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, %s) ON DUPLICATE KEY UPDATE `option_name` = VALUES(`option_name`), `option_value` = VALUES(`option_value`), `autoload` = VALUES(`autoload`)", $option, $serialized_value, $autoload ) );
	if ( ! $result )
		return false;
 
	if ( ! defined( 'WP_INSTALLING' ) ) {
		if ( 'yes' == $autoload ) {
			$alloptions = wp_load_alloptions();
			$alloptions = $serialized_value;
			wp_cache_set( 'alloptions', $alloptions, 'options' );
		} else {
			wp_cache_set( $option, $serialized_value, 'options' );
		}
	}
 
	// This option exists now
	$notoptions = wp_cache_get( 'notoptions', 'options' ); // yes, again... we need it to be fresh
	if ( is_array( $notoptions ) && isset( $notoptions ) ) {
		unset( $notoptions );
		wp_cache_set( 'notoptions', $notoptions, 'options' );
	}
 
	/**
	 * Fires after a specific option has been added.
	 *
	 * The dynamic portion of the hook name, $option, refers to the option name.
	 *
	 * @since 2.5.0 As "add_option_{$name}"
	 * @since 3.0.0
	 *
	 * @param string $option Name of the option to add.
	 * @param mixed  $value  Value of the option.
	 */
	do_action( "add_option_{$option}", $option, $value );
 
	/**
	 * Fires after an option has been added.
	 *
	 * @since 2.9.0
	 *
	 * @param string $option Name of the added option.
	 * @param mixed  $value  Value of the option.
	 */
	do_action( 'added_option', $option, $value );
	return true;
}
 
/**
 * Removes option by name. Prevents removal of protected WordPress options.
 *
 * @since 1.2.0
 *
 * @param string $option Name of option to remove. Expected to not be SQL-escaped.
 * @return bool True, if option is successfully deleted. False on failure.
 */
function delete_option( $option ) {
	global $wpdb;
 
	$option = trim( $option );
	if ( empty( $option ) )
		return false;
 
	wp_protect_special_option( $option );
 
	// Get the ID, if no ID then return
	$row = $wpdb->get_row( $wpdb->prepare( "SELECT autoload FROM $wpdb->options WHERE option_name = %s", $option ) );
	if ( is_null( $row ) )
		return false;
 
	/**
	 * Fires immediately before an option is deleted.
	 *
	 * @since 2.9.0
	 *
	 * @param string $option Name of the option to delete.
	 */
	do_action( 'delete_option', $option );
 
	$result = $wpdb->delete( $wpdb->options, array( 'option_name' => $option ) );
	if ( ! defined( 'WP_INSTALLING' ) ) {
		if ( 'yes' == $row->autoload ) {
			$alloptions = wp_load_alloptions();
			if ( is_array( $alloptions ) && isset( $alloptions ) ) {
				unset( $alloptions );
				wp_cache_set( 'alloptions', $alloptions, 'options' );
			}
		} else {
			wp_cache_delete( $option, 'options' );
		}
	}
	if ( $result ) {
 
		/**
		 * Fires after a specific option has been deleted.
		 *
		 * The dynamic portion of the hook name, $option, refers to the option name.
		 *
		 * @since 3.0.0
		 *
		 * @param string $option Name of the deleted option.
		 */
		do_action( "delete_option_$option", $option );
 
		/**
		 * Fires after an option has been deleted.
		 *
		 * @since 2.9.0
		 *
		 * @param string $option Name of the deleted option.
		 */
		do_action( 'deleted_option', $option );
		return true;
	}
	return false;
}
 
/**
 * Delete a transient.
 *
 * @since 2.8.0
 *
 * @param string $transient Transient name. Expected to not be SQL-escaped.
 * @return bool true if successful, false otherwise
 */
function delete_transient( $transient ) {
 
	/**
	 * Fires immediately before a specific transient is deleted.
	 *
	 * The dynamic portion of the hook name, $transient, refers to the transient name.
	 *
	 * @since 3.0.0
	 *
	 * @param string $transient Transient name.
	 */
	do_action( 'delete_transient_' . $transient, $transient );
 
	if ( wp_using_ext_object_cache() ) {
		$result = wp_cache_delete( $transient, 'transient' );
	} else {
		$option_timeout = '_transient_timeout_' . $transient;
		$option = '_transient_' . $transient;
		$result = delete_option( $option );
		if ( $result )
			delete_option( $option_timeout );
	}
 
	if ( $result ) {
 
		/**
		 * Fires after a transient is deleted.
		 *
		 * @since 3.0.0
		 *
		 * @param string $transient Deleted transient name.
		 */
		do_action( 'deleted_transient', $transient );
	}
 
	return $result;
}
 
/**
 * Get the value of a transient.
 *
 * If the transient does not exist or does not have a value, then the return value
 * will be false.
 *
 * @since 2.8.0
 *
 * @param string $transient Transient name. Expected to not be SQL-escaped
 * @return mixed Value of transient
 */
function get_transient( $transient ) {
 
 	/**
	 * Filter the value of an existing transient.
	 *
	 * The dynamic portion of the hook name, $transient, refers to the transient name.
	 *
	 * Passing a truthy value to the filter will effectively short-circuit retrieval
	 * of the transient, returning the passed value instead.
	 *
	 * @since 2.8.0
	 *
	 * @param mixed $pre_transient The default value to return if the transient does not exist.
	 *                             Any value other than false will short-circuit the retrieval
	 *                             of the transient, and return the returned value.
	 */
	$pre = apply_filters( 'pre_transient_' . $transient, false );
	if ( false !== $pre )
		return $pre;
 
	if ( wp_using_ext_object_cache() ) {
		$value = wp_cache_get( $transient, 'transient' );
	} else {
		$transient_option = '_transient_' . $transient;
		if ( ! defined( 'WP_INSTALLING' ) ) {
			// If option is not in alloptions, it is not autoloaded and thus has a timeout
			$alloptions = wp_load_alloptions();
			if ( !isset( $alloptions ) ) {
				$transient_timeout = '_transient_timeout_' . $transient;
				if ( get_option( $transient_timeout ) < time() ) {
					delete_option( $transient_option  );
					delete_option( $transient_timeout );
					$value = false;
				}
			}
		}
 
		if ( ! isset( $value ) )
			$value = get_option( $transient_option );
	}
 
	/**
	 * Filter an existing transient's value.
	 *
	 * The dynamic portion of the hook name, $transient, refers to the transient name.
	 *
	 * @since 2.8.0
	 *
	 * @param mixed $value Value of transient.
	 */
	return apply_filters( 'transient_' . $transient, $value );
}
 
/**
 * Set/update the value of a transient.
 *
 * You do not need to serialize values. If the value needs to be serialized, then
 * it will be serialized before it is set.
 *
 * @since 2.8.0
 *
 * @param string $transient Transient name. Expected to not be SQL-escaped.
 * @param mixed $value Transient value. Must be serializable if non-scalar. Expected to not be SQL-escaped.
 * @param int $expiration Time until expiration in seconds, default 0
 * @return bool False if value was not set and true if value was set.
 */
function set_transient( $transient, $value, $expiration = 0 ) {
 
	/**
	 * Filter a specific transient before its value is set.
	 *
	 * The dynamic portion of the hook name, $transient, refers to the transient name.
	 *
	 * @since 3.0.0
	 *
	 * @param mixed $value New value of transient.
	 */
	$value = apply_filters( 'pre_set_transient_' . $transient, $value );
 
	$expiration = (int) $expiration;
 
	if ( wp_using_ext_object_cache() ) {
		$result = wp_cache_set( $transient, $value, 'transient', $expiration );
	} else {
		$transient_timeout = '_transient_timeout_' . $transient;
		$transient = '_transient_' . $transient;
		if ( false === get_option( $transient ) ) {
			$autoload = 'yes';
			if ( $expiration ) {
				$autoload = 'no';
				add_option( $transient_timeout, time() + $expiration, '', 'no' );
			}
			$result = add_option( $transient, $value, '', $autoload );
		} else {
			// If expiration is requested, but the transient has no timeout option,
			// delete, then re-create transient rather than update.
			$update = true;
			if ( $expiration ) {
				if ( false === get_option( $transient_timeout ) ) {
					delete_option( $transient );
					add_option( $transient_timeout, time() + $expiration, '', 'no' );
					$result = add_option( $transient, $value, '', 'no' );
					$update = false;
				} else {
					update_option( $transient_timeout, time() + $expiration );
				}
			}
			if ( $update ) {
				$result = update_option( $transient, $value );
			}
		}
	}
 
	if ( $result ) {
 
		/**
		 * Fires after the value for a specific transient has been set.
		 *
		 * The dynamic portion of the hook name, $transient, refers to the transient name.
		 *
		 * @since 3.0.0
		 *
		 * @param mixed $value      Transient value.
		 * @param int   $expiration Time until expiration in seconds. Default 0.
		 */
		do_action( 'set_transient_' . $transient, $value, $expiration );
 
		/**
		 * Fires after the value for a transient has been set.
		 *
		 * @since 3.0.0
		 *
		 * @param string $transient  The name of the transient.
		 * @param mixed  $value      Transient value.
		 * @param int    $expiration Time until expiration in seconds. Default 0.
		 */
		do_action( 'setted_transient', $transient, $value, $expiration );
	}
	return $result;
}
 
/**
 * Saves and restores user interface settings stored in a cookie.
 *
 * Checks if the current user-settings cookie is updated and stores it. When no
 * cookie exists (different browser used), adds the last saved cookie restoring
 * the settings.
 *
 * @since 2.7.0
 */
function wp_user_settings() {
 
	if ( ! is_admin() )
		return;
 
	if ( defined('DOING_AJAX') )
		return;
 
	if ( ! $user_id = get_current_user_id() )
		return;
 
	if ( is_super_admin() && ! is_user_member_of_blog() )
		return;
 
	$settings = (string) get_user_option( 'user-settings', $user_id );
 
	if ( isset( $_COOKIE ) ) {
		$cookie = preg_replace( '//', '', $_COOKIE );
 
		// No change or both empty
		if ( $cookie == $settings )
			return;
 
		$last_saved = (int) get_user_option( 'user-settings-time', $user_id );
		$current = isset( $_COOKIE) ? preg_replace( '//', '', $_COOKIE ) : 0;
 
		// The cookie is newer than the saved value. Update the user_option and leave the cookie as-is
		if ( $current > $last_saved ) {
			update_user_option( $user_id, 'user-settings', $cookie, false );
			update_user_option( $user_id, 'user-settings-time', time() - 5, false );
			return;
		}
	}
 
	// The cookie is not set in the current browser or the saved value is newer.
	setcookie( 'wp-settings-' . $user_id, $settings, time() + YEAR_IN_SECONDS, SITECOOKIEPATH );
	setcookie( 'wp-settings-time-' . $user_id, time(), time() + YEAR_IN_SECONDS, SITECOOKIEPATH );
	$_COOKIE = $settings;
}
 
/**
 * Retrieve user interface setting value based on setting name.
 *
 * @since 2.7.0
 *
 * @param string $name The name of the setting.
 * @param string $default Optional default value to return when $name is not set.
 * @return mixed the last saved user setting or the default value/false if it doesn't exist.
 */
function get_user_setting( $name, $default = false ) {
	$all_user_settings = get_all_user_settings();
 
	return isset( $all_user_settings ) ? $all_user_settings : $default;
}
 
/**
 * Add or update user interface setting.
 *
 * Both $name and $value can contain only ASCII letters, numbers and underscores.
 * This function has to be used before any output has started as it calls setcookie().
 *
 * @since 2.8.0
 *
 * @param string $name The name of the setting.
 * @param string $value The value for the setting.
 * @return bool true if set successfully/false if not.
 */
function set_user_setting( $name, $value ) {
 
	if ( headers_sent() )
		return false;
 
	$all_user_settings = get_all_user_settings();
	$all_user_settings = $value;
 
	return wp_set_all_user_settings( $all_user_settings );
}
 
/**
 * Delete user interface settings.
 *
 * Deleting settings would reset them to the defaults.
 * This function has to be used before any output has started as it calls setcookie().
 *
 * @since 2.7.0
 *
 * @param mixed $names The name or array of names of the setting to be deleted.
 * @return bool true if deleted successfully/false if not.
 */
function delete_user_setting( $names ) {
 
	if ( headers_sent() )
		return false;
 
	$all_user_settings = get_all_user_settings();
	$names = (array) $names;
	$deleted = false;
 
	foreach ( $names as $name ) {
		if ( isset( $all_user_settings ) ) {
			unset( $all_user_settings );
			$deleted = true;
		}
	}
 
	if ( $deleted )
		return wp_set_all_user_settings( $all_user_settings );
 
	return false;
}
 
/**
 * Retrieve all user interface settings.
 *
 * @since 2.7.0
 *
 * @return array the last saved user settings or empty array.
 */
function get_all_user_settings() {
	global $_updated_user_settings;
 
	if ( ! $user_id = get_current_user_id() )
		return array();
 
	if ( isset( $_updated_user_settings ) && is_array( $_updated_user_settings ) )
		return $_updated_user_settings;
 
	$user_settings = array();
	if ( isset( $_COOKIE ) ) {
		$cookie = preg_replace( '//', '', $_COOKIE );
 
		if ( $cookie && strpos( $cookie, '=' ) ) // '=' cannot be 1st char
			parse_str( $cookie, $user_settings );
 
	} else {
		$option = get_user_option( 'user-settings', $user_id );
		if ( $option && is_string($option) )
			parse_str( $option, $user_settings );
	}
 
	$_updated_user_settings = $user_settings;
	return $user_settings;
}
 
/**
 * Private. Set all user interface settings.
 *
 * @since 2.8.0
 *
 * @param array $user_settings
 * @return bool
 */
function wp_set_all_user_settings( $user_settings ) {
	global $_updated_user_settings;
 
	if ( ! $user_id = get_current_user_id() )
		return false;
 
	if ( is_super_admin() && ! is_user_member_of_blog() )
		return;
 
	$settings = '';
	foreach ( $user_settings as $name => $value ) {
		$_name = preg_replace( '/+/', '', $name );
		$_value = preg_replace( '/+/', '', $value );
 
		if ( ! empty( $_name ) )
			$settings .= $_name . '=' . $_value . '&';
	}
 
	$settings = rtrim($settings, '&');
	parse_str( $settings, $_updated_user_settings );
 
	update_user_option( $user_id, 'user-settings', $settings, false );
	update_user_option( $user_id, 'user-settings-time', time(), false );
 
	return true;
}
 
/**
 * Delete the user settings of the current user.
 *
 * @since 2.7.0
 */
function delete_all_user_settings() {
	if ( ! $user_id = get_current_user_id() )
		return;
 
	update_user_option( $user_id, 'user-settings', '', false );
	setcookie('wp-settings-' . $user_id, ' ', time() - YEAR_IN_SECONDS, SITECOOKIEPATH);
}
 
/**
 * Retrieve site option value based on name of option.
 *
 * @since 2.8.0
 *
 * @see get_option()
 *
 * @param string $option Name of option to retrieve. Expected to not be SQL-escaped.
 * @param mixed $default Optional value to return if option doesn't exist. Default false.
 * @param bool $use_cache Whether to use cache. Multisite only. Default true.
 * @return mixed Value set for the option.
 */
function get_site_option( $option, $default = false, $use_cache = true ) {
	global $wpdb;
 
	/**
	 * Filter an existing site option before it is retrieved.
	 *
	 * The dynamic portion of the hook name, $option, refers to the option name.
	 *
	 * Passing a truthy value to the filter will effectively short-circuit retrieval,
	 * returning the passed value instead.
	 *
	 * @since 2.9.0 As 'pre_site_option_' . $key
	 * @since 3.0.0
	 *
	 * @param mixed $pre_option The default value to return if the option does not exist.
	 */
 	$pre = apply_filters( 'pre_site_option_' . $option, false );
 
 	if ( false !== $pre )
 		return $pre;
 
	// prevent non-existent options from triggering multiple queries
	$notoptions_key = "{$wpdb->siteid}:notoptions";
	$notoptions = wp_cache_get( $notoptions_key, 'site-options' );
 
	if ( isset( $notoptions ) ) {
 
		/**
		 * Filter a specific default site option.
		 *
		 * The dynamic portion of the hook name, $option, refers to the option name.
		 *
		 * @since 3.4.0
		 *
		 * @param mixed $default The value to return if the site option does not exist
		 *                       in the database.
		 */
		return apply_filters( 'default_site_option_' . $option, $default );
	}
 
	if ( ! is_multisite() ) {
 
		/** This filter is documented in wp-includes/option.php */
		$default = apply_filters( 'default_site_option_' . $option, $default );
		$value = get_option($option, $default);
	} else {
		$cache_key = "{$wpdb->siteid}:$option";
		if ( $use_cache )
			$value = wp_cache_get($cache_key, 'site-options');
 
		if ( !isset($value) || (false === $value) ) {
			$row = $wpdb->get_row( $wpdb->prepare("SELECT meta_value FROM $wpdb->sitemeta WHERE meta_key = %s AND site_id = %d", $option, $wpdb->siteid ) );
 
			// Has to be get_row instead of get_var because of funkiness with 0, false, null values
			if ( is_object( $row ) ) {
				$value = $row->meta_value;
				$value = maybe_unserialize( $value );
				wp_cache_set( $cache_key, $value, 'site-options' );
			} else {
				$notoptions = true;
				wp_cache_set( $notoptions_key, $notoptions, 'site-options' );
 
				/** This filter is documented in wp-includes/option.php */
				$value = apply_filters( 'default_site_option_' . $option, $default );
			}
		}
	}
 
	/**
	 * Filter the value of an existing site option.
	 *
	 * The dynamic portion of the hook name, $option, refers to the option name.
	 *
	 * @since 2.9.0 As 'site_option_' . $key
	 * @since 3.0.0
	 *
	 * @param mixed $value Value of site option.
	 */
 	return apply_filters( 'site_option_' . $option, $value );
}
 
/**
 * Add a new site option.
 *
 * Existing options will not be updated. Note that prior to 3.3 this wasn't the case.
 *
 * @since 2.8.0
 *
 * @see add_option()
 *
 * @param string $option Name of option to add. Expected to not be SQL-escaped.
 * @param mixed $value Optional. Option value, can be anything. Expected to not be SQL-escaped.
 * @return bool False if option was not added and true if option was added.
 */
function add_site_option( $option, $value ) {
	global $wpdb;
 
	wp_protect_special_option( $option );
 
	/**
	 * Filter the value of a specific site option before it is added.
	 *
	 * The dynamic portion of the hook name, $option, refers to the option name.
	 *
	 * @since 2.9.0 As 'pre_add_site_option_' . $key
	 * @since 3.0.0
	 *
	 * @param mixed $value Value of site option.
	 */
	$value = apply_filters( 'pre_add_site_option_' . $option, $value );
 
	$notoptions_key = "{$wpdb->siteid}:notoptions";
 
	if ( !is_multisite() ) {
		$result = add_option( $option, $value );
	} else {
		$cache_key = "{$wpdb->siteid}:$option";
 
		// Make sure the option doesn't already exist. We can check the 'notoptions' cache before we ask for a db query
		$notoptions = wp_cache_get( $notoptions_key, 'site-options' );
		if ( ! is_array( $notoptions ) || ! isset( $notoptions ) )
			if ( false !== get_site_option( $option ) )
				return false;
 
		$value = sanitize_option( $option, $value );
 
		$serialized_value = maybe_serialize( $value );
		$result = $wpdb->insert( $wpdb->sitemeta, array('site_id' => $wpdb->siteid, 'meta_key' => $option, 'meta_value' => $serialized_value ) );
 
		if ( ! $result )
			return false;
 
		wp_cache_set( $cache_key, $value, 'site-options' );
 
		// This option exists now
		$notoptions = wp_cache_get( $notoptions_key, 'site-options' ); // yes, again... we need it to be fresh
		if ( is_array( $notoptions ) && isset( $notoptions ) ) {
			unset( $notoptions );
			wp_cache_set( $notoptions_key, $notoptions, 'site-options' );
		}
	}
 
	if ( $result ) {
 
		/**
		 * Fires after a specific site option has been successfully added.
		 *
		 * The dynamic portion of the hook name, $option, refers to the option name.
		 *
		 * @since 2.9.0 As "add_site_option_{$key}"
		 * @since 3.0.0
		 *
		 * @param string $option Name of site option.
		 * @param mixed  $value  Value of site option.
		 */
		do_action( "add_site_option_{$option}", $option, $value );
 
		/**
		 * Fires after a site option has been successfully added.
		 *
		 * @since 3.0.0
		 *
		 * @param string $option Name of site option.
		 * @param mixed  $value  Value of site option.
		 */
		do_action( "add_site_option", $option, $value );
 
		return true;
	}
	return false;
}
 
/**
 * Removes site option by name.
 *
 * @since 2.8.0
 *
 * @see delete_option()
 *
 * @param string $option Name of option to remove. Expected to not be SQL-escaped.
 * @return bool True, if succeed. False, if failure.
 */
function delete_site_option( $option ) {
	global $wpdb;
 
	// ms_protect_special_option( $option ); @todo
 
	/**
	 * Fires immediately before a specific site option is deleted.
	 *
	 * The dynamic portion of the hook name, $option, refers to the option name.
	 *
	 * @since 3.0.0
	 */
	do_action( 'pre_delete_site_option_' . $option );
 
	if ( !is_multisite() ) {
		$result = delete_option( $option );
	} else {
		$row = $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM {$wpdb->sitemeta} WHERE meta_key = %s AND site_id = %d", $option, $wpdb->siteid ) );
		if ( is_null( $row ) || !$row->meta_id )
			return false;
		$cache_key = "{$wpdb->siteid}:$option";
		wp_cache_delete( $cache_key, 'site-options' );
 
		$result = $wpdb->delete( $wpdb->sitemeta, array( 'meta_key' => $option, 'site_id' => $wpdb->siteid ) );
	}
 
	if ( $result ) {
 
		/**
		 * Fires after a specific site option has been deleted.
		 *
		 * The dynamic portion of the hook name, $option, refers to the option name.
		 *
		 * @since 2.9.0 As "delete_site_option_{$key}"
		 * @since 3.0.0
		 *
		 * @param string $option Name of the site option.
		 */
		do_action( "delete_site_option_{$option}", $option );
 
		/**
		 * Fires after a site option has been deleted.
		 *
		 * @since 3.0.0
		 *
		 * @param string $option Name of the site option.
		 */
		do_action( "delete_site_option", $option );
 
		return true;
	}
	return false;
}
 
/**
 * Update the value of a site option that was already added.
 *
 * @since 2.8.0
 *
 * @see update_option()
 *
 * @param string $option Name of option. Expected to not be SQL-escaped.
 * @param mixed $value Option value. Expected to not be SQL-escaped.
 * @return bool False if value was not updated and true if value was updated.
 */
function update_site_option( $option, $value ) {
	global $wpdb;
 
	wp_protect_special_option( $option );
 
	$old_value = get_site_option( $option );
 
	/**
	 * Filter a specific site option before its value is updated.
	 *
	 * The dynamic portion of the hook name, $option, refers to the option name.
	 *
	 * @since 2.9.0 As 'pre_update_site_option_' . $key
	 * @since 3.0.0
	 *
	 * @param mixed $value     New value of site option.
	 * @param mixed $old_value Old value of site option.
	 */
	$value = apply_filters( 'pre_update_site_option_' . $option, $value, $old_value );
 
	if ( $value === $old_value )
		return false;
 
	if ( false === $old_value )
		return add_site_option( $option, $value );
 
	$notoptions_key = "{$wpdb->siteid}:notoptions";
	$notoptions = wp_cache_get( $notoptions_key, 'site-options' );
	if ( is_array( $notoptions ) && isset( $notoptions ) ) {
		unset( $notoptions );
		wp_cache_set( $notoptions_key, $notoptions, 'site-options' );
	}
 
	if ( !is_multisite() ) {
		$result = update_option( $option, $value );
	} else {
		$value = sanitize_option( $option, $value );
 
		$serialized_value = maybe_serialize( $value );
		$result = $wpdb->update( $wpdb->sitemeta, array( 'meta_value' => $serialized_value ), array( 'site_id' => $wpdb->siteid, 'meta_key' => $option ) );
 
		if ( $result ) {
			$cache_key = "{$wpdb->siteid}:$option";
			wp_cache_set( $cache_key, $value, 'site-options' );
		}
	}
 
	if ( $result ) {
 
		/**
		 * Fires after the value of a specific site option has been successfully updated.
		 *
		 * The dynamic portion of the hook name, $option, refers to the option name.
		 *
		 * @since 2.9.0 As "update_site_option_{$key}"
		 * @since 3.0.0
		 *
		 * @param string $option    Name of site option.
		 * @param mixed  $value     Current value of site option.
		 * @param mixed  $old_value Old value of site option.
		 */
		do_action( "update_site_option_{$option}", $option, $value, $old_value );
 
		/**
		 * Fires after the value of a site option has been successfully updated.
		 *
		 * @since 3.0.0
		 *
		 * @param string $option    Name of site option.
		 * @param mixed  $value     Current value of site option.
		 * @param mixed  $old_value Old value of site option.
		 */
		do_action( "update_site_option", $option, $value, $old_value );
 
		return true;
	}
	return false;
}
 
/**
 * Delete a site transient.
 *
 * @since 2.9.0
 *
 * @param string $transient Transient name. Expected to not be SQL-escaped.
 * @return bool True if successful, false otherwise
 */
function delete_site_transient( $transient ) {
 
	/**
	 * Fires immediately before a specific site transient is deleted.
	 *
	 * The dynamic portion of the hook name, $transient, refers to the transient name.
	 *
	 * @since 3.0.0
	 *
	 * @param string $transient Transient name.
	 */
	do_action( 'delete_site_transient_' . $transient, $transient );
 
	if ( wp_using_ext_object_cache() ) {
		$result = wp_cache_delete( $transient, 'site-transient' );
	} else {
		$option_timeout = '_site_transient_timeout_' . $transient;
		$option = '_site_transient_' . $transient;
		$result = delete_site_option( $option );
		if ( $result )
			delete_site_option( $option_timeout );
	}
	if ( $result ) {
 
		/**
		 * Fires after a transient is deleted.
		 *
		 * @since 3.0.0
		 *
		 * @param string $transient Deleted transient name.
		 */
		do_action( 'deleted_site_transient', $transient );
	}
 
	return $result;
}
 
/**
 * Get the value of a site transient.
 *
 * If the transient does not exist or does not have a value, then the return value
 * will be false.
 *
 * @since 2.9.0
 *
 * @see get_transient()
 *
 * @param string $transient Transient name. Expected to not be SQL-escaped.
 * @return mixed Value of transient
 */
function get_site_transient( $transient ) {
 
	/**
	 * Filter the value of an existing site transient.
	 *
	 * The dynamic portion of the hook name, $transient, refers to the transient name.
	 *
	 * Passing a truthy value to the filter will effectively short-circuit retrieval,
	 * returning the passed value instead.
	 *
	 * @since 2.9.0
	 *
	 * @param mixed $pre_site_transient The default value to return if the site transient does not exist.
	 *                                  Any value other than false will short-circuit the retrieval
	 *                                  of the transient, and return the returned value.
	 */
	$pre = apply_filters( 'pre_site_transient_' . $transient, false );
 
	if ( false !== $pre )
		return $pre;
 
	if ( wp_using_ext_object_cache() ) {
		$value = wp_cache_get( $transient, 'site-transient' );
	} else {
		// Core transients that do not have a timeout. Listed here so querying timeouts can be avoided.
		$no_timeout = array('update_core', 'update_plugins', 'update_themes');
		$transient_option = '_site_transient_' . $transient;
		if ( ! in_array( $transient, $no_timeout ) ) {
			$transient_timeout = '_site_transient_timeout_' . $transient;
			$timeout = get_site_option( $transient_timeout );
			if ( false !== $timeout && $timeout < time() ) {
				delete_site_option( $transient_option  );
				delete_site_option( $transient_timeout );
				$value = false;
			}
		}
 
		if ( ! isset( $value ) )
			$value = get_site_option( $transient_option );
	}
 
	/**
	 * Filter the value of an existing site transient.
	 *
	 * The dynamic portion of the hook name, $transient, refers to the transient name.
	 *
	 * @since 2.9.0
	 *
	 * @param mixed $value Value of site transient.
	 */
	return apply_filters( 'site_transient_' . $transient, $value );
}
 
/**
 * Set/update the value of a site transient.
 *
 * You do not need to serialize values, if the value needs to be serialize, then
 * it will be serialized before it is set.
 *
 * @since 2.9.0
 *
 * @see set_transient()
 *
 * @param string $transient Transient name. Expected to not be SQL-escaped.
 * @param mixed $value Transient value. Expected to not be SQL-escaped.
 * @param int $expiration Time until expiration in seconds, default 0
 * @return bool False if value was not set and true if value was set.
 */
function set_site_transient( $transient, $value, $expiration = 0 ) {
 
	/**
	 * Filter the value of a specific site transient before it is set.
	 *
	 * The dynamic portion of the hook name, $transient, refers to the transient name.
	 *
	 * @since 3.0.0
	 *
	 * @param mixed $value Value of site transient.
	 */
	$value = apply_filters( 'pre_set_site_transient_' . $transient, $value );
 
	$expiration = (int) $expiration;
 
	if ( wp_using_ext_object_cache() ) {
		$result = wp_cache_set( $transient, $value, 'site-transient', $expiration );
	} else {
		$transient_timeout = '_site_transient_timeout_' . $transient;
		$option = '_site_transient_' . $transient;
		if ( false === get_site_option( $option ) ) {
			if ( $expiration )
				add_site_option( $transient_timeout, time() + $expiration );
			$result = add_site_option( $option, $value );
		} else {
			if ( $expiration )
				update_site_option( $transient_timeout, time() + $expiration );
			$result = update_site_option( $option, $value );
		}
	}
	if ( $result ) {
 
		/**
		 * Fires after the value for a specific site transient has been set.
		 *
		 * The dynamic portion of the hook name, $transient, refers to the transient name.
		 *
		 * @since 3.0.0
		 *
		 * @param mixed $value      Site transient value.
		 * @param int   $expiration Time until expiration in seconds. Default 0.
		 */
		do_action( 'set_site_transient_' . $transient, $value, $expiration );
 
		/**
		 * Fires after the value for a site transient has been set.
		 *
		 * @since 3.0.0
		 *
		 * @param string $transient  The name of the site transient.
		 * @param mixed  $value      Site transient value.
		 * @param int    $expiration Time until expiration in seconds. Default 0.
		 */
		do_action( 'setted_site_transient', $transient, $value, $expiration );
	}
	return $result;
}
 
?>

Díky za moc za radu.

28. 12. 2014 23:01:02

https://webtrh.cz/diskuse/warning-cannot-modify-header-information-headers-already-sent-by/#reply946741

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