4. Largest palindrome product PHP Solve

4.php

<?php
/*
 * projecteuler.net
 * 4. Largest palindrome product PHP Solve
 */

$max = 0;

$output = null;
for ($i = 100; $i < 1000; $i++ ) {
  for ($j = 100; $j < 1000; $j++) {
    $mul = $i*$j;
    if ($mul == strrev($mul) && $mul > $max) {
      $max = $mul;
    }
  }
}

echo "$max\n";