Mine

<?php 
$y="bottle";
$x=$y."s";
$z="of beer";
$q="on the wall";
for($b=99;$b>1;$b--){
echo"$b $x $z $q, $b $x $z.\nTake one down and pass it around, ".($b-1)." ".($b>2?$x:$y)." $z $q.\n\n";
}
echo"1 $y $z $q, 1 $y $z.\nGo to the store and buy some more, 99 $x $z $q.";