- printf: documentation ( source)
<?php
function helloworldcode() {
$l1=('He'./*HE HE*/'llo w'./*or HI (bad style to write 'low')*/'or'./*or AND*/'ld'/*<- bug no meaning*/);
for($lI=$ll=0;$ll>=$lI;$ll++&&$lI++//$II+*
){z($l1[$ll%=4]);/*$II+=$lI<<$ll*///$II++
if($lI!=($ll%true)+2);else break;}z('!');z("\x21\x0a");
}function z($l1='$?\"'){printf("%s",$l1);};
?>