Implementation of scheduled tasks in php

PHP script execution time limit, the default solution is 30 m: set_time_limit (); or modify PHP. ini to set max_execution_time (not recommended)

Several problems need to be solved to refresh the browser using php
If the browser of the client is closed, the program may be terminated. Solution: ignore_user_abort can still run normally even if the page is closed.
If the program runs continuously, it may consume a lot of resources. The solution is to use sleep to sleep the program for a while, and then run
PHP code regularly executed:

The Code is as follows:

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<? Php Ignore_user_abort (); // close the browser and run the PHP script. Set_time_limit (3000); // you can use set_time_limit (0) to run the program without restrictions. $ Interval = 5; // run every 5s // Method 1 -- endless loop Do { Echo 'test'. time (). '<br/> '; Sleep ($ interval); // wait for 5 s } While (true ); // Method 2 --- regular sleep execution Require_once './curlClass. php'; // introduce the file   $ Curl = new httpCurl (); // instantiate $ Stime = $ curl-> getmicrotime (); For ($ I = 0; $ I <= 10; $ I ++ ){ Echo 'test'. time (). '<br/> '; Sleep ($ interval); // wait for 5 s } Ob_flush (); Flush (); $ Etime = $ curl-> getmicrotime (); Echo 'Echo round ($ etime-stime), 4); // program execution time