<?php

function isPalindrome($text) {

    $text = (string)$text;

    // This is the long and stupid way of doing this
    $backwards = '';
    for ($i = strlen($text) - 1; $i >= 0 ; $i--) {
        $backwards .= $text{$i};
    }

    return $text == $backwards;

}

$max = 0;
for ($i = 100; $i < 1000; $i++) {
    for ($j = 100; $j < 1000; $j++) {
        $num = $i * $j;
        $max = isPalindrome($num) && $num > $max ? $num : $max;
    }
}
echo $max;