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Enjoy a randomly generated fortune:

$ fortune | cowsay

 _________________________________________
/  * In anticipation of 2.10.02 release,  \
| updated to patchlevel                   |
|                                         |
| +ircu2.10.01+.config6-7.config7-8.lglin |
| e3.iwho.limit.glibc.motdcache2.trace.wh |
| ois1-2.config8-9.statsw.sprintf2-3.msgt |
| ree2.memleak1-2+.msgtree2-3.gline8-9.gl |
| ine9-10.invite2.rbr.stats.numclients.wh |
| isper.whisper1-2.stats1-2.nokick1-2.chr |
| oot.config9-11.snomask7-8.limi+t1-3.use |
| rip1-3.userip3-4.config11-12.config12-1 |
| 3.umode2-3.akillsbt.who4-5.kn.kn1-2.fre |
| ebsdcore2.msgtree3-5.y2k.glibc1-2.rmfun |
| c.msgf+lags2.who5-6.nickchange2.glibc2- |
| 3.modeless3                             |
|                                         |
| -- From the annoucement of ircd         |
\ 2.10.01-3 for Debian GNU/Linux          /
 -----------------------------------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

Here is the PHP code:

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