Ticket #13659: poc.php

<?php

/**
 * Recursive directory creation based on full path.
 *
 * Will attempt to set permissions on folders.
 *
 * @since 2.0.1
 *
 * @param string $target Full path to attempt to create.
 * @return bool Whether the path was created. True if path already exists.
 */
function wp_mkdir_p( $target ) {
        // from php.net/mkdir user contributed notes
        $target = str_replace( '//', '/', $target );

        // safe mode fails with a trailing slash under certain PHP versions.
        $target = rtrim($target, '/'); // Use rtrim() instead of untrailingslashit to avoid formatting.php dependency.
        if ( empty($target) )
                $target = '/';

        if ( file_exists( $target ) )
                return @is_dir( $target );

        // Attempting to create the directory may clutter up our display.
        if ( @mkdir( $target ) ) {
                $stat = @stat( dirname( $target ) );
                $dir_perms = $stat['mode'] & 0007777;  // Get the permission bits.
                @chmod( $target, $dir_perms );
                return true;
        } elseif ( is_dir( dirname( $target ) ) ) {
                        return false;
        }

        // If the above failed, attempt to create the parent node, then try again.
        if ( ( $target != '/' ) && ( wp_mkdir_p( dirname( $target ) ) ) )
                return wp_mkdir_p( $target );

        return false;
}

wp_mkdir_p( dirname(__FILE__) . '/1/2/3/4/' );
?>