wp_update_themes( array $extra_stats = array() )

Description

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$extra_statsarrayoptional

Extra statistics to report to the WordPress.org API.Default: array()

Performance profile

How much work a call to wp_update_themes() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class

Expensive

Reaches an outbound HTTP request via wp_remote_post().

Scaling

Scales with input

The body loops, so the work grows with what you pass in.

Instructions

48–215

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 389.

Plugin surface

2 hooks

Third-party callbacks on 'themes_update_check_locales', 'update_themes_{$hostname}' run inside this call, and their cost is not bounded by anything here.

Called by

4

4 places in core call this, so the cost is paid more often than your own code shows.

What it touches

• transienttransientget_site_transient()called directly
• optionoption read or writeget_option()called directly
• hookthird-party callbacksapply_filters()called directly
• httpoutbound HTTP requestwp_remote_post()called directly
• serializeserialisationjson_decode()called directly
• cacheobject cachewp_cache_get()one call below wp_update_themes()

Further down the call graph this can also reach query. That is the worst case, several calls deep and usually down an error path, not what a normal call pays.

What one call costs · 37 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost wp_update_themes() can have, taken from its control-flow graph on PHP 8.5.

This body has more branch combinations than are worth enumerating, so the table covers the outcomes found first rather than every one that exists.

Hooks and filters fired · 2

2 hooks fire while wp_update_themes() runs, in this order:

1. 1
   apply_filters( themes_update_check_locales )filterline 726 (+100 into the body)

   Filters the locales requested for theme translations.

2. 2
   apply_filters( update_themes_{$hostname} )filterline 833 (+207 into the body)

   Filters the update response for a given theme hostname.

Uses · 24

• wp_installing()Checks or sets whether WordPress is in "installation" mode.
• wp_get_themes()Returns an array of WP_Theme objects based on the arguments.
• wp_get_installed_translations()Gets installed translations.
• get_site_transient()Retrieves the value of a site transient.
• get_option()Retrieves an option value based on an option name.
• wp_doing_cron()Determines whether the current request is a WordPress cron request.
• current_filter()Retrieves the name of the current filter hook.
• set_site_transient()Sets/updates the value of a site transient.
• get_available_languages()Gets all available languages based on the presence of *.mo and *.l10n.php files in a given directory.
• apply_filters()Calls the callback functions that have been added to a filter hook.
• wp_json_encode()Encodes a variable into JSON, with some confidence checks.
• wp_get_wp_version()Returns the current WordPress version.

Used by · 4

• WP_Automatic_Updater::run()Kicks off the background update process, looping through all pending updates.
• WP_Debug_Data::check_for_updates()Calls all core functions to check for updates.
• _maybe_update_themes()Checks themes versions only after a duration of time.
• wp_ajax_update_theme()Handles updating a theme via AJAX.

Source code

View on Trac ↗View on GitHub ↗

626function wp_update_themes( $extra_stats = array() ) {627	if ( wp_installing() ) {628		return;629	}630 631	$installed_themes = wp_get_themes();632	$translations     = wp_get_installed_translations( 'themes' );633 634	$last_update = get_site_transient( 'update_themes' );635 636	if ( ! is_object( $last_update ) ) {637		$last_update = new stdClass();638	}639 640	$themes  = array();641	$checked = array();642	$request = array();643 644	// Put slug of active theme into request.645	$request['active'] = get_option( 'stylesheet' );646 647	foreach ( $installed_themes as $theme ) {648		$checked[ $theme->get_stylesheet() ] = $theme->get( 'Version' );649 650		$themes[ $theme->get_stylesheet() ] = array(651			'Name'       => $theme->get( 'Name' ),652			'Title'      => $theme->get( 'Name' ),653			'Version'    => $theme->get( 'Version' ),654			'Author'     => $theme->get( 'Author' ),655			'Author URI' => $theme->get( 'AuthorURI' ),656			'UpdateURI'  => $theme->get( 'UpdateURI' ),657			'Template'   => $theme->get_template(),658			'Stylesheet' => $theme->get_stylesheet(),659		);660	}661 662	$doing_cron = wp_doing_cron();663 664	// Check for update on a different schedule, depending on the page.665	switch ( current_filter() ) {666		case 'upgrader_process_complete':667			$timeout = 0;668			break;669		case 'load-update-core.php':670			$timeout = MINUTE_IN_SECONDS;671			break;672		case 'load-themes.php':673		case 'load-update.php':674			$timeout = HOUR_IN_SECONDS;675			break;676		default:677			if ( $doing_cron ) {678				$timeout = 2 * HOUR_IN_SECONDS;679			} else {680				$timeout = 12 * HOUR_IN_SECONDS;681			}682	}683 684	$time_not_changed = isset( $last_update->last_checked ) && $timeout > ( time() - $last_update->last_checked );685 686	if ( $time_not_changed && ! $extra_stats ) {687		$theme_changed = false;688 689		foreach ( $checked as $slug => $v ) {690			if ( ! isset( $last_update->checked[ $slug ] ) || (string) $last_update->checked[ $slug ] !== (string) $v ) {691				$theme_changed = true;692			}693		}694 695		if ( isset( $last_update->response ) && is_array( $last_update->response ) ) {696			foreach ( $last_update->response as $slug => $update_details ) {697				if ( ! isset( $checked[ $slug ] ) ) {698					$theme_changed = true;699					break;700				}701			}702		}703 704		// Bail if we've checked recently and if nothing has changed.705		if ( ! $theme_changed ) {

Changelog

Introduced in 2.7.0. Unchanged from 6.7.7 through 7.1.0.

1. 6.7.7
2. 6.8.8
3. 6.9.7
4. 7.0.4
5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 7.0.4 tag, from src/wp-includes/update.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

Something wrong on this page? Report it and it gets fixed in the next regeneration.