Path is present, Permissions are okay, but still getting error

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http://serverfault.com – I recently installed pdftk using instruction provided at stack overflow I installed it, and run the commanded whereis pdftk the result was /usr/local/bin/pdftk /usr/bin/pdftk I have the powerpannel access and I saw it through it that pdftk actually exists at the location i run the command pdftk --version, it was okay but when in php i use <?php $command = "pdftk --help"; system("PATH=/usr/local/bin/ && $command",$response); if ($response===FALSE){ echo 'sorry error occured'; } else{ echo $response; } ?> the output is 127 the version i am using is 1.41 (HowTos)