PHP regularly deletes files in a folder (clears cache files)

php regularly deletes files in a folder
<?php <br> ignore_user_abort(); //When the client is disconnected, the script can continue to execute in the background <br> set_time_limit(0); //Ignore the script running time limit set by php.ini <br> $interval = 5*60; //Set the execution period in seconds, 5 minutes is 5*60=300 <br> do{<br> $dir = "temp/"; //Your temporary directory location <br> $handle=opendir("{$dir}/"); <br> while (false !== ($file=readdir($handle))) { <br> if ($file!="." && $file!=".." && !is_dir("{$dir}/{$file}")) { <br> @unlink ("{$dir}/{$file}"); <br> } <br> } <br> closedir($handle); //Close the directory opened by the opendir() function <br> sleep($interval); //After executing a cycle, sleep for $interval time, and the script will continue to execute after the sleep ends <br> }while(true); //Periodically execute the script