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 ↗

4375function wp_ajax_delete_theme() {4376	check_ajax_referer( 'updates' );4377 4378	if ( empty( $_POST['slug'] ) ) {4379		wp_send_json_error(4380			array(4381				'slug'         => '',4382				'errorCode'    => 'no_theme_specified',4383				'errorMessage' => __( 'No theme specified.' ),4384			)4385		);4386	}4387 4388	$stylesheet = preg_replace( '/[^A-z0-9_\-]/', '', wp_unslash( $_POST['slug'] ) );4389	$status     = array(4390		'delete' => 'theme',4391		'slug'   => $stylesheet,4392	);4393 4394	if ( ! current_user_can( 'delete_themes' ) ) {4395		$status['errorMessage'] = __( 'Sorry, you are not allowed to delete themes on this site.' );4396		wp_send_json_error( $status );4397	}4398 4399	if ( ! wp_get_theme( $stylesheet )->exists() ) {4400		$status['errorMessage'] = __( 'The requested theme does not exist.' );4401		wp_send_json_error( $status );4402	}4403 4404	// Check filesystem credentials. `delete_theme()` will bail otherwise.4405	$url = wp_nonce_url( 'themes.php?action=delete&stylesheet=' . urlencode( $stylesheet ), 'delete-theme_' . $stylesheet );4406 4407	ob_start();4408	$credentials = request_filesystem_credentials( $url );4409	ob_end_clean();4410 4411	if ( false === $credentials || ! WP_Filesystem( $credentials ) ) {4412		global $wp_filesystem;4413 4414		$status['errorCode']    = 'unable_to_connect_to_filesystem';4415		$status['errorMessage'] = __( 'Unable to connect to the filesystem. Please confirm your credentials.' );4416 4417		// Pass through the error from WP_Filesystem if one was raised.4418		if ( $wp_filesystem instanceof WP_Filesystem_Base && is_wp_error( $wp_filesystem->errors ) && $wp_filesystem->errors->has_errors() ) {4419			$status['errorMessage'] = esc_html( $wp_filesystem->errors->get_error_message() );4420		}4421 4422		wp_send_json_error( $status );4423	}4424 4425	require_once ABSPATH . 'wp-admin/includes/theme.php';4426 4427	$result = delete_theme( $stylesheet );4428 4429	if ( is_wp_error( $result ) ) {4430		$status['errorMessage'] = $result->get_error_message();4431		wp_send_json_error( $status );4432	} elseif ( false === $result ) {4433		$status['errorMessage'] = __( 'Theme could not be deleted.' );4434		wp_send_json_error( $status );4435	}4436 4437	wp_send_json_success( $status );4438}

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 6.8.8 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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