No your all wrong
If you want to pipe an email to a php script using a cpanel based server create a plain text file and call it aliases (no extention). Put the pertinant info into that file. I'll show a working example:
support: |/home/user/public_html/helpdesk/email_support.pl
********
Upload the file to etc in the root of your account (/home/user/etc)
Any email sent to support@yourdomain will get piped to email_support.pl for processing.