如何在PHP中实现事件驱动的代码？

像javascript一样的东西.

例如,尝试打开套接字(open_socket)并执行其他命令(do_something_else),而不是等待套接字请求的成功响应.
获得成功响应后执行callback_execute.

//--------------------------------------------------------------------
public function open_socket(){
$this->socketResource = fsockopen($this->nodeIp,$this->portNumber);
}

public function callback_execute(){
fputs($this->socketResource,$command);
}

public function do_something_else{ xxxxx }
//--------------------------------------------------------------------

Non_blocking_function($obj->open_socket(),$obj->callback_execute());
$obj->do_something_else();