PHP 等待 exec 完成并输出结果

Question

I have a php file that takes in a couple parameters from the URL and then runs an exec command, in which i want to wait and have the results of the exec displayed. This exec command takes about 20-30 seconds to finish. It never completes because the webpage just gets an nginx 502 bad gateway error (times out).. Instead of extending nginx timeout error, as that's bad practice to have a connection hang for that long, how can i run the php's exec in the back and then have it returned on the page after it's complete? Or is there a better way to accomplish this without using php?

Answer 1

Have the PHP trigger an exec to a script that is forked so it runs in the background (ends with & ). The page should then return some js that periodically polls the server via ajax requests to check the original script's status. The script should output its STDOUT and STDERR to unique file(s) so that the polling script can check the status.

Edit: If you need to know the script's exit code wrap it in another script:

#/bin/bash
uniqId=$1
yourscript $uniqId &
myPid=$!
echo $myPid > $uniqId'.pid'
wait $myPid
echo $? > $uniqId'.returned'

Call like ./wrapper.sh someIdUniqueToClient & . Untested, but you get the gist.