Simple php code to only run if no file are locked

Despot.php

<?php

/**
 * Utility class to test if you can take a control over a locked file
 */
class Despot {
    /**
     * Try to take the control of a file
     */
    public static function putsch($key)
    {
        $f = fopen(sys_get_temp_dir() . '/' . $key, 'w');

        return $f && flock($f, LOCK_EX | LOCK_NB);
    }
}