php as cron

I'm trying to test php running as a cron job and I have installed php as a CGI in /usr/local/bin and I have edited my crontab file to call a php file every two minutes. However, it's not working and I was wondering if you all would know what's going on. Anyway, here's how I have things set up. crontab file: */2 * * * * php /home/crontest.php > /dev/null crontest.php: #!/usr/local/bin/php -q <?php mail("email@email.com","cron test", "testing",NULL); ?> email I'm receiving with error: Subject: Cron <> php /home/crontest.php > /dev/null Body: /bin/sh: php: command not found thanks for any help.