Is there a way to use shell_exec without waiting for the command to complete?
I have a process intensive task that I would like to run in the background.
The user clicks on a page, the PHP script runs, and finally, based on some conditions, if required, then it has to run a shell script, E.G.:
shell_exec('php measurePerformance.php 47 844 [email protected]');
Currently I use shell_exec, but this requires the script to wait for an output. Is there any way to execute the command I want without waiting for it to complete?
Verified Answer (148 Votes) ✓
How about adding.
"> /dev/null 2>/dev/null &" shell_exec('php measurePerformance.php 47 844 [email protected] > /dev/null 2>/dev/null &');
Note this also gets rid of the stdio and stderr.
Answer #2 (28 Votes)
This will execute a command and disconnect from the running process. Of course, it can be any command you want. But for a test, you can create a php file with a sleep(20) command it.
exec("nohup /usr/bin/php -f sleep.php > /dev/null 2>&1 &");
Answer #3 (11 Votes)
You can also give your output back to the client instantly and continue processing your PHP code afterwards.
This is the method I am using for long-waiting Ajax calls which would not have any effect on client side:
ob_end_clean(); ignore_user_abort(); ob_start(); header("Connection: close"); echo json_encode($out); header("Content-Length: " . ob_get_length()); ob_end_flush(); flush(); // execute your command here. client will not wait for response, it already has one above.
You can find the detailed explanation here: http://oytun.co/response-now-process-later