Reverse Number

<?php
$number= 123;
$rev = 0;
while($number> 1){
    $rem = $temp % 10;
    $rev = ($rev * 10) +$rem;
    $temp = $number/ 10;
}
echo $rev;

#########################################

$num = 1234;
$reverse = 0;
$split = str_split($num);
for($i = count($split)-1; $i >= 0; $i--){
  $reverse .= $split[$i];
}
echo $reverse;
?>