Returns a unique identifier for the current thread zend_logo_guid zend_version PHP Options/Info Functions PHP Manual zend_thread_id (PHP 5)zend_thread_id — Returns a unique identifier for the current thread Description int zend_thread_id ( void ) This function returns an unique identifier for the current thread. Return Values Returns the thread id as an integer. Notes Note: This function is only available if PHP has been built with ZTS (Zend Thread Safety) support and debug mode (--enable-debug). zend_logo_guid zend_version PHP Options/Info Functions PHP Manual