php exec in background not working [duplicate]

This question already has answers here: Closed 11 years ago.

Possible Duplicate:

Call another PHP script and return control to user before the other script completes

Hello,

I'm executing this开发者_开发百科 command in php:

exec('php /path/to/script.php one_argument_passed &");

But it's not executing it in the background. Is there a setting or something in php I need to do to make this work?

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Maybe you have a permissions problem.