wp_opcache_invalidate( string $filepath, bool $force = false ): bool

Source

/**
 * Attempts to clear the opcode cache for an individual PHP file.
 *
 * This function can be called safely without having to check the file extension
 * or availability of the OPcache extension.
 *
 * Whether or not invalidation is possible is cached to improve performance.
 *
 * @since 5.5.0
 *
 * @link https://www.php.net/manual/en/function.opcache-invalidate.php
 *
 * @param string $filepath Path to the file, including extension, for which the opcode cache is to be cleared.
 * @param bool   $force    Invalidate even if the modification time is not newer than the file in cache.
 *                         Default false.
 * @return bool True if opcache was invalidated for `$filepath`, or there was nothing to invalidate.
 *              False if opcache invalidation is not available, or is disabled via filter.
 */
function wp_opcache_invalidate( $filepath, $force = false ) {
	static $can_invalidate = null;

	/*
	 * Check to see if WordPress is able to run `opcache_invalidate()` or not, and cache the value.
	 *
	 * First, check to see if the function is available to call, then if the host has restricted
	 * the ability to run the function to avoid a PHP warning.
	 *
	 * `opcache.restrict_api` can specify the path for files allowed to call `opcache_invalidate()`.
	 *
	 * If the host has this set, check whether the path in `opcache.restrict_api` matches
	 * the beginning of the path of the origin file.
	 *
	 * `$_SERVER['SCRIPT_FILENAME']` approximates the origin file's path, but `realpath()`
	 * is necessary because `SCRIPT_FILENAME` can be a relative path when run from CLI.
	 *
	 * For more details, see:
	 * - https://www.php.net/manual/en/opcache.configuration.php
	 * - https://www.php.net/manual/en/reserved.variables.server.php
	 * - https://core.trac.wordpress.org/ticket/36455
	 */
	if ( null === $can_invalidate
		&& function_exists( 'opcache_invalidate' )
		&& ( ! ini_get( 'opcache.restrict_api' )
			|| stripos( realpath( $_SERVER['SCRIPT_FILENAME'] ), ini_get( 'opcache.restrict_api' ) ) === 0 )
	) {
		$can_invalidate = true;
	}

	// If invalidation is not available, return early.
	if ( ! $can_invalidate ) {
		return false;
	}

	// Verify that file to be invalidated has a PHP extension.

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