src/class-wp-register.php
protected static function create_directory_from_file( $file ) {

		$path = dirname( $file );

		if ( ! is_dir( $path ) ) {
			return mkdir( $path, 0777, true );
		}

		return true;
	}
protected static function create_directory_from_file( $file ) {

		$path = dirname( $file );

		if ( ! is_dir( $path ) ) {
			return mkdir( $path, 0777, true );
		}

		return true;
	}
Create directory where external/unified/minimized files will be saved.

@since 1.0.4

@param string $file → filepath.

@return boolean