exec - I can't create a PHP background process -

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so after user submits form want create php background process checks stuff data submitted, if leave still want checking problem can't work, i've looked @ questions related on site , not find solution. did find code here 

exec(sprintf("%s > %s 2>&1 & echo $! >> %s", $cmd, "output.txt", "pid.txt"));

but problem outputs last thing , adds junk in there to.

output:

sh: line 1: *****: command not found


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