php in background exec() function

Question

I made this script to test the execution of PHP as a background process

foreach($tests as $test) { 
   exec("php test.php ".$test["id"]); 
}

as suggested in php process background and How to add large number of event notification reminder via Google Calendar API using PHP? and php execute a background process

But the script does not run faster than when it was all in one script without the addition of test.php.

What am I doing wrong?

Thanks in advance!

Similar to a question I answered a few days ago: stackoverflow.com/questions/4626860/… — Michael Irigoyen
– Michael Irigoyen, Commented Jan 10, 2011 at 16:58

Marc B · Accepted Answer · 2011-01-10 16:48:38Z

8

exec() will block until the process you're exec'ing has completed - in otherwords, you're basically running your 'test.php' as a subroutine. At bare minimum you need to add a & to the command line arguments, which would put that exec()'d process into the background:

exec("php test.php {$test['id']} &");

edited Jan 10, 2011 at 16:48

answered Jan 10, 2011 at 12:36

Marc B

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3 Comments

albertopriore Over a year ago

does not work the content of $test['id'] is only a number. so the command looks like exec('php test.php &150'); is it correct?

Marc B Over a year ago

Woops, sorry, should be php test.php 150 &. The ampersand has to be the last character. I'll fix up the answer.

jpschroeder Over a year ago

According to the manual, it also requires output redirection in order to run in the background. php test.php 150 > /dev/null &

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