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Enjoy a randomly generated fortune:

$ fortune | cowsay

 _________________________________________
/  In a forest a fox bumps into a little  \
| rabbit, and says, "Hi, Junior, what are |
| you up to?"                             |
|                                         |
| "I'm writing a dissertation on how      |
| rabbits eat foxes," said the rabbit.    |
|                                         |
| "Come now, friend rabbit, you know      |
| that's impossible! No one will publish  |
| such rubbish!"                          |
|                                         |
| "Well, follow me and I'll show you."    |
|                                         |
| They both go into the rabbit's dwelling |
| and after a while the rabbit emerges    |
| with a satisfied expression on his      |
| face. Comes along a wolf. "Hello,       |
| little buddy, what are we doing these   |
| days?"                                  |
|                                         |
| "I'm writing the 2'nd chapter of my     |
| thesis, on how rabbits devour wolves."  |
|                                         |
| "Are you crazy? Where's your academic   |
| honesty?"                               |
|                                         |
| "Come with me and I'll show you."       |
|                                         |
| As before, the rabbit comes out with a  |
| satisfied look on his face and a        |
| diploma in his paw. Finally, the camera |
| pans into the rabbit's cave and, as     |
| everybody should have guessed by now,   |
| we see a mean-looking, huge lion,       |
| sitting, picking his teeth and          |
| belching, next to some furry, bloody    |
| remnants of the wolf and the fox.       |
|                                         |
| The moral: It's not the contents of     |
| your thesis that are important -- it's  |
\ your PhD advisor that really counts.    /
 -----------------------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

Here is the PHP code:

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