I want to trigger a shell command in eider exec() or system() from PHP script but it is a task that take a while to complete, is there a way to trigger it and continue running the PHP page load without delay?
Edit: I am on CentOS 6, PHP 5.3
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5 Answers
Depends on the OS you are using.
For linux:
pclose(popen("php somefile.php &","r"));
notice the amperstand at the end (very important).
For windows:
pclose(popen("start php.exe somefile.php","r"));
here the start keyword is important.
Hope this helps.
5 Comments
adrianTNT
I tried
exec("php video_processor.php &"); and delay is the same, then also if I set a sleep(10) inside video_processor.php then my parent script also waits for 10 seconds.
Eduard Luca
Try with
pclose(popen("php video_processor.php &","r")); or pclose(popen("/usr/bin/php video_processor.php &","r")); (I assume your PHP is installed in the default location)adrianTNT
It worked with this one:
pclose(popen("php video_processor.php &","r")); so then I edited mine and it worked: pclose(popen("ffmpeg -i 'videos/sample.mp4' -qmax 1 -vframes 1 -ss 80 videos/images/1.jpg &","r")); Thank you. :party: :)
Matt Korostoff
Wow, I can't believe how easy and simple this is to do! Brilliant solution! I have researched this at some length before and every other solution recommended complex strategies for forking or threading a PHP process.
MSC
Windows specific comment: I used to use: pclose(popen("start /B php.exe somefile.php","r")); as of Windows 10 Creators Update (1703) - the "/B" background switch for "start" command doesnt work. Glad to see that it isnt needed.
This doesn't answer your question directly, but you should consider doing your video conversion work in a background process with either a cron job or using a queue such as Beanstalkd.
This way you can stack up your ffmpeg work in the background without blocking your webserver.
I've had a lot of success with both methods (cron / queue) in the past.
Some other posts about background processes:
php execute a background process
Run a ffmpeg process in the background
Using ffmpeg, PHP and beanstalk
Some tools you might find useful:
http://kevin.vanzonneveld.net/techblog/article/create_daemons_in_php/
Comments
What I do:
public function post_create()
{
ob_end_clean();
header("Connection: close");
ignore_user_abort(); // optional
ob_start();
echo "Tell ajax to gtfo!";
$size = ob_get_length();
header("Content-Length: $size");
ob_end_flush(); // Strange behaviour, will not work
flush(); // Unless both are called !
// Do processing here
}
1 Comment
Zombo
Seems to work with just
header('Content-Length:0');flush(); for meThis should work:
shell_exec("nohup yourcommand > /dev/null 2> /dev/null &");
Edit: sorry, dunno why I excluded the & to put it to bg 2> redirects STDOUT and STDERR to /dev/null.
4 Comments
adrianTNT
Command runs but the delay is there, this is the full command:
shell_exec("ffmpeg -i 'videos/sample.mp4' -qmax 1 -vframes 1 -ss 80 videos/images/1.jpg 2> /dev/null");
Uku Loskit
try: shell_exec("nohup ffmpeg -i 'videos/sample.mp4' -qmax 1 -vframes 1 -ss 80 videos/images/1.jpg > /dev/null 2> /dev/null")
adrianTNT
Same delay, command executed fine. Maybe ffmpeg just acts differently?
Uku Loskit
Just tested this myself with PHP and ffmpeg and now it works.
Well use an ajax request to activate the exec part ...then continue with the other tasks
3 Comments
adrianTNT
It would probably work but there should be an easier and more reliable way, like a parameter at the end of exec() or system();
hummingBird
I don't get the -1 level. Guy gave a short answer. Maybe disliked, but still a fair one.
user1447420
After trying any other solution finally managed to make it work using your suggestion. Thank you very much!
