Convert Numbers to Numbers and Letters in PHP

Question

I have the following number 353711000 and I need to convert it to 35371TH in PHP.

How would I go about this?

Answer 1

Without regular expressions:

$i = 353711000;
if ($i % 1000 == 0) {
    $s = strval($i / 1000) . 'TH';
} else {
    $s = strval($i);
}
print_r($s);