PHP implementation Multithreading (is actually a multi-process, Kua platform)

CodeThe implementation of a simple process management mechanism is much more convenient than sending multiple requests to a Web server to achieve multiple processes. Can only be used in CLI mode. Can be used in special occasions, such as mail delivery tasks.
Shared access to resources uses file locks, which are not very reliable, primarily to be able to be used under WINDWOS, and if it is really necessary to consider using the appropriate semaphore mechanism (this extension can only be used for Xunix).

Instance
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PHP Code:

define ( ' dir_php_exec ' ,   ' php ' );
define ( ' dir_main_exec ' ,   __file__ );
define ( ' dir_tmp ' ,   '/tmp ' );
require_once ( ' my_process.php ' );

class  pp  extends  my_process_base  {
    public function  Run ( $param   =  <