using shell_exec to call a perl script from php

I am having an issue with executing a perl script from php using the shell_exec() function.

This is what I have tried (and it has worked before).

$perl = shell_exec("/usr/bin/perl cbh_script_clean.pl");
echo ($perl);

This will not 开发者_运维百科work as $perl does not contain anything after this is executed.

Thoughts?

All help is appreciated!

Thanks.

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I'll make that an answer then.

You can often append 2>&1 to redirect the stderr output to the normal stdout stream. This way you receive any error messages in the PHP variable. (Otherwise they will get lost with system/exec/shell_exec, which is why people sometimes use proc_open with explicit pipes instead).

$perl = shell_exec("/usr/bin/perl cbh_script_clean.pl 2>&1");
echo ($perl);

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Try this:

$perl = shell_exec("/usr/bin/perl cbh_script_clean.pl 2>/dev/null >/dev/null &"); echo ($perl);