An example of code to implement multi-process and multi-tasking in PHP

/**
*Based on PHP5
*With the help of proc_open
* you can start multiple processes, you can use your imagination to do what you want
*If you are running php on Linux and enable the pcntl module, use the pcntl function. Better
*Last modified: by bbs.it-home.org 2013/6/20
**/
    error_reporting(E_ALL);
    set_time_limit(0);
    class Thread {
    protected $_pref; // process reference
    protected static $_instance = null;
    protected $_pipes;
    private function __construct() {
    $this->_pref = 0;
    }
    public static function getInstance($file) {
    if (null == self::$_instance) {
    self::$_instance = new self;
    }
    $descriptor = array(
    0 => array("pipe", "r"),
    1 => array("pipe", "w"),
    2 => array("file", "./error-output.txt", "a"),
    );
    self::$_instance->_pref = proc_open("php -q $file", $descriptor, self::$_instance->_pipes);
    return true;
    }
    public function __destruct() {
    proc_close($this->_pref);
    $this->_pref = null;
}
?>