wp_ajax_delete_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_delete_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

Moderate

Reads stored settings via get_option(), cached per request but not free on a cold cache.

Scaling

Constant

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

Instructions

69–133

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 141.

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

• hookthird-party callbacksdo_action()one call below wp_ajax_delete_theme()
• optionoption read or writeget_option()one call below wp_ajax_delete_theme()

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

What one call costs · 216 distinct outcomes

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

Uses · 14

• 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.
• wp_nonce_url()Retrieves URL with nonce added to URL query.
• request_filesystem_credentials()Displays a form to the user to request for their FTP/SSH details in order to connect to the filesystem.
• WP_Filesystem()Initializes and connects the WordPress Filesystem Abstraction classes.
• is_wp_error()Checks whether the given variable is a WordPress Error.
• esc_html()Escaping for HTML blocks.
• delete_theme()Removes a theme.

Source code

View on Trac ↗View on GitHub ↗

4378function wp_ajax_delete_theme() {4379	check_ajax_referer( 'updates' );4380 4381	if ( empty( $_POST['slug'] ) ) {4382		wp_send_json_error(4383			array(4384				'slug'         => '',4385				'errorCode'    => 'no_theme_specified',4386				'errorMessage' => __( 'No theme specified.' ),4387			)4388		);4389	}4390 4391	$stylesheet = preg_replace( '/[^A-z0-9_\-]/', '', wp_unslash( $_POST['slug'] ) );4392	$status     = array(4393		'delete' => 'theme',4394		'slug'   => $stylesheet,4395	);4396 4397	if ( ! current_user_can( 'delete_themes' ) ) {4398		$status['errorMessage'] = __( 'Sorry, you are not allowed to delete themes on this site.' );4399		wp_send_json_error( $status );4400	}4401 4402	if ( ! wp_get_theme( $stylesheet )->exists() ) {4403		$status['errorMessage'] = __( 'The requested theme does not exist.' );4404		wp_send_json_error( $status );4405	}4406 4407	// Check filesystem credentials. `delete_theme()` will bail otherwise.4408	$url = wp_nonce_url( 'themes.php?action=delete&stylesheet=' . urlencode( $stylesheet ), 'delete-theme_' . $stylesheet );4409 4410	ob_start();4411	$credentials = request_filesystem_credentials( $url );4412	ob_end_clean();4413 4414	if ( false === $credentials || ! WP_Filesystem( $credentials ) ) {4415		global $wp_filesystem;4416 4417		$status['errorCode']    = 'unable_to_connect_to_filesystem';4418		$status['errorMessage'] = __( 'Unable to connect to the filesystem. Please confirm your credentials.' );4419 4420		// Pass through the error from WP_Filesystem if one was raised.4421		if ( $wp_filesystem instanceof WP_Filesystem_Base && is_wp_error( $wp_filesystem->errors ) && $wp_filesystem->errors->has_errors() ) {4422			$status['errorMessage'] = esc_html( $wp_filesystem->errors->get_error_message() );4423		}4424 4425		wp_send_json_error( $status );4426	}4427 4428	require_once ABSPATH . 'wp-admin/includes/theme.php';4429 4430	$result = delete_theme( $stylesheet );4431 4432	if ( is_wp_error( $result ) ) {4433		$status['errorMessage'] = $result->get_error_message();4434		wp_send_json_error( $status );4435	} elseif ( false === $result ) {4436		$status['errorMessage'] = __( 'Theme could not be deleted.' );4437		wp_send_json_error( $status );4438	}4439 4440	wp_send_json_success( $status );4441}

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 6.9.7 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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