function maxint(){
$to_test = 2;
while(1){
$last = $to_test;
$to_test = 2 * $to_test;
if (($to_test < $last) || (!is_int($to_test))){
return($last + ($last - 1));
}
}
}
$maxint = maxint();
print("Maxint is $maxint
");
?>