Humour de développeur par le code

But why ? It won't work

<?
if($GLOBALS["IS_ADMIN"] && true==false)
{
//
}
?>

It won't work

<?
function dateStringToSql($str)
{
    $retour=NULL;

    return($retour);
}
?>

It won't work

<?
if($_SESSION['Var'] == $id) {
	$var = $id;
} else {
	$var = 0;
}
$var = '';
?>

All the sources codes "It won't work"page 8