- 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);