Using return codes
Published: Monday, Oct 18, 2010 Last modified: Tuesday, Nov 26, 2024
Follow Arve’s guide how to hide shell output. I use this in scripts and I focus on the return code.
However beware of &>
, consider the following code:
system("echo foo | grep bar", $returncode);
echo $returncode . "\n";
system("echo foo | grep bar > /dev/null 2>&1", $returncode);
echo $returncode . "\n";
system("echo foo | grep bar &>/dev/null", $returncode);
echo $returncode . "\n"
I am not sure how PHP executes shell, but as you can see it returns the wrong error code when using &>/dev/null
in the third case:
$ php test.php
1
1
0