How to implement event driven code in PHP?

Question

Is it possible to implement an event driven program in PHP?

Something like javascript.

As an example, try opening socket(open_socket) and running a few other command(do_something_else) instead of waiting for a response to the socket request. After receiving a success response, execute 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(); 

Answer 1

In PHP, there is only one thread. Therefore, doing something useful while waiting for an event is not possible in PHP.

Some workarounds are available, but probably not very reliable - especially if you plan on writing portable code. I assume that workarounds are risky as the language does not have the concept of concurrency. Therefore, it is best to write multi-threaded code in another language (Java, Scala, ...) and use PHP only to display prepared results (if at all use PHP for such problems).