- substr: documentation ( source)
- var_dump: documentation ( source)
- strpos: documentation ( source)
- strrchr: documentation ( source)
<?php
var_dump(substr($number, strrchr($number, '.') + 1));
die;
$number = 12.4444;
$decimal = strlen(substr($number, strpos($number, '.') + 1));
var_dump($decimal);