- var_dump: documentation ( source)
- uasort: documentation ( source)
<?php
$array = array(
3 => 2,
2 => 1,
1 => NULL,
4 => NULL,
);
uasort($array, function ($a, $b) {
if ($a === $b) {
return 0;
}
elseif ($a === NULL) {
return 1;
}
elseif ($b === NULL) {
return -1;
}
return ($a < $b) ? -1 : 1;
});
var_dump($array);