wp_ajax_update_theme()

Compatibility

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

Performance profile

How much work a call to wp_ajax_update_theme() 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

Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions

78–141

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 189.

Plugin surface

None

Nothing here hands control to plugin code.

Called by

0

Nothing in core calls this; the cost is only what you spend yourself.

What it touches

• transienttransientget_site_transient()called directly
• hookthird-party callbacksdo_action()one call below wp_ajax_update_theme()
• cacheobject cachewp_cache_get()one call below wp_ajax_update_theme()
• optionnetwork optionget_site_option()one call below wp_ajax_update_theme()
• httpoutbound HTTP requestwp_remote_post()one call below wp_ajax_update_theme()

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

What one call costs · 352 distinct outcomes

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

Uses · 13

• check_ajax_referer()Verifies the Ajax request to prevent processing requests external of the blog.
• wp_send_json_error()Sends a JSON response back to an Ajax request, indicating failure.
• __()Retrieves the translation of $text.
• wp_unslash()Removes slashes from a string or recursively removes slashes from strings within an array.
• current_user_can()Returns whether the current user has the specified capability.
• wp_get_theme()Gets a WP_Theme object for a theme.
• get_site_transient()Retrieves the value of a site transient.
• wp_update_themes()Checks for available updates to themes based on the latest versions hosted on WordPress.org.
• is_wp_error()Checks whether the given variable is a WordPress Error.
• wp_send_json_success()Sends a JSON response back to an Ajax request, indicating success.
• esc_html()Escaping for HTML blocks.
• WP_Ajax_Upgrader_Skin::__construct()Constructor.

Source code

View on Trac ↗View on GitHub ↗

4317function wp_ajax_update_theme() {4318	check_ajax_referer( 'updates' );4319 4320	if ( empty( $_POST['slug'] ) ) {4321		wp_send_json_error(4322			array(4323				'slug'         => '',4324				'errorCode'    => 'no_theme_specified',4325				'errorMessage' => __( 'No theme specified.' ),4326			)4327		);4328	}4329 4330	$stylesheet = preg_replace( '/[^A-z0-9_\-]/', '', wp_unslash( $_POST['slug'] ) );4331	$status     = array(4332		'update'     => 'theme',4333		'slug'       => $stylesheet,4334		'oldVersion' => '',4335		'newVersion' => '',4336	);4337 4338	if ( ! current_user_can( 'update_themes' ) ) {4339		$status['errorMessage'] = __( 'Sorry, you are not allowed to update themes for this site.' );4340		wp_send_json_error( $status );4341	}4342 4343	$theme = wp_get_theme( $stylesheet );4344	if ( $theme->exists() ) {4345		$status['oldVersion'] = $theme->get( 'Version' );4346	}4347 4348	require_once ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';4349 4350	$current = get_site_transient( 'update_themes' );4351	if ( empty( $current ) ) {4352		wp_update_themes();4353	}4354 4355	$skin     = new WP_Ajax_Upgrader_Skin();4356	$upgrader = new Theme_Upgrader( $skin );4357	$result   = $upgrader->bulk_upgrade( array( $stylesheet ) );4358 4359	if ( defined( 'WP_DEBUG' ) && WP_DEBUG ) {4360		$status['debug'] = $skin->get_upgrade_messages();4361	}4362 4363	if ( is_wp_error( $skin->result ) ) {4364		$status['errorCode']    = $skin->result->get_error_code();4365		$status['errorMessage'] = $skin->result->get_error_message();4366		wp_send_json_error( $status );4367	} elseif ( $skin->get_errors()->has_errors() ) {4368		$status['errorMessage'] = $skin->get_error_messages();4369		wp_send_json_error( $status );4370	} elseif ( is_array( $result ) && ! empty( $result[ $stylesheet ] ) ) {4371 4372		// Theme is already at the latest version.4373		if ( true === $result[ $stylesheet ] ) {4374			$status['errorMessage'] = $upgrader->strings['up_to_date'];4375			wp_send_json_error( $status );4376		}4377 4378		$theme = wp_get_theme( $stylesheet );4379		if ( $theme->exists() ) {4380			$status['newVersion'] = $theme->get( 'Version' );4381		}4382 4383		wp_send_json_success( $status );4384	} elseif ( false === $result ) {4385		global $wp_filesystem;4386 4387		$status['errorCode']    = 'unable_to_connect_to_filesystem';4388		$status['errorMessage'] = __( 'Unable to connect to the filesystem. Please confirm your credentials.' );4389 4390		// Pass through the error from WP_Filesystem if one was raised.4391		if ( $wp_filesystem instanceof WP_Filesystem_Base && is_wp_error( $wp_filesystem->errors ) && $wp_filesystem->errors->has_errors() ) {4392			$status['errorMessage'] = esc_html( $wp_filesystem->errors->get_error_message() );4393		}4394 4395		wp_send_json_error( $status );4396	}

Changelog

Introduced in 4.6.0. 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 7.1.0 tag, from src/wp-admin/includes/ajax-actions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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