- array_search: documentation ( source)
- print_r: documentation ( source)
- usort: documentation ( source)
<?php
$sizes = array("L", "XXXL", "M", "S", "O");
function compare($a, $b) {
$sizeincrement = array("XS", "S", "M", "L", "XL", "XXL", "XXXL");
return array_search($a, $sizeincrement) > array_search($b, $sizeincrement);
}
usort($sizes, "compare");
print_r($sizes);