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Enjoy a randomly generated fortune:

$ fortune | cowsay

 _______________________________________
/ Peter's Law of Substitution:          \
|                                       |
| Look after the molehills, and the     |
|                                       |
| mountains will look after themselves. |
|                                       |
| Peter's Principle of Success:         |
|                                       |
| Get up one time more than you're      |
\ knocked down.                         /
 ---------------------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

Here is the PHP code:

$output = shell_exec("/usr/games/fortune | /usr/games/cowsay");
echo $output;