zero
<?$a=array(one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thir,four,fif,six,seven,eigh,nine);foreach($a as$i=>$n)echo$n,$i>11?teen:'','
';$a[$i=11]=twen;for($a[13]='for';$i<19;){echo$t=$a[$i++].ty,'
';for($j=0;$j<9;)echo"$t ",$a[$j++],'
';}?>one hundred
Note that non-ascii characters in the above source code will be escaped (such as \x9f).