PHP ajax asynchronous execution without waiting for the execution result_PHP tutorial

How to handle PHP ajax asynchronous execution without waiting for the execution result

This article mainly introduces the processing method of PHP ajax asynchronous execution without waiting for the execution result. This article directly gives the implementation code , friends in need can refer to it

In the short address generation application, a web page snapshot needs to be generated based on the long address. This generation time is not instant and unpredictable.

Therefore, the solution adopted by the front desk is generally to display the generated short address first, and then periodically AJAX check whether the web page snapshot has been generated.

So, the PHP code is processed as follows:

The code is as follows:

// The server here uses phantomjs to generate web page snapshots

　$cd = '/home/emp/phpinstall/phantomjs-1.5.0/bin/phantomjs /home/emp/phpinstall/phantomjs/snap.js "'.$url.'" /home/emp/public_html_demo/ cms/'.$thumb.' & ';

try{

@pclose(popen($cd,"r"));

　}catch(Exception $e){}

Ajax script for front-end Js:

The code is as follows:

　_wt = window.setInterval("sys.ajax('?m=shorturl&c=index&a=check_snap','',callback.checkSnap);",200);

The callback function checkSnap waits for PHP's check_snap to detect whether the web page snapshot file is generated.

After receiving the generated information, clear the _wt timer.

The code is as follows:

clearTimeout(_wt);

In this way, the JFYF pair of PHP and front-end AJAX are cooperating happily~