protected function executeCallbacks()
	{
		if ($this->callbacks_executed) {
			return;
		}
		
		$this->callbacks_executed = true;
		
		foreach ($this->callbacks as $callback) {
			if ($q = call_user_func($callback, $this->query)) {
				$this->query = $q;
			}
		}
	}
protected function executeCallbacks()
	{
		if ($this->callbacks_executed) {
			return;
		}
		
		$this->callbacks_executed = true;
		
		foreach ($this->callbacks as $callback) {
			if ($q = call_user_func($callback, $this->query)) {
				$this->query = $q;
			}
		}
	}
protected function executeCallbacks ( ) { if ( $ this -> callbacks_executed ) { return ; } $ this -> callbacks_executed = true ; foreach ( $ this -> callbacks as $ callback ) { if ( $ q = call_user_func ( $ callback , $ this -> query ) ) { $ this -> query = $ q ; } } }
Execute any callback functions. Only execute once.

@return void
Execute any callback functions . Only execute once .