- print_r: documentation ( source)
- sort: documentation ( source)
<?php
$a = array('123', '456A', '78'); sort($a); print_r($a);
$b = array('456A', '78', '123'); sort($b); print_r($b);
$c = array('78', '123', '456A'); sort($c); print_r($c);
$d = array('78', '456A', '123'); sort($d); print_r($d);