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<!DOCTYPE html>
<html>
<body>
<?php
function my_sort($a, $b) {
  if ($a == $b) return 0;
  return ($a < $b) ? -1 : 1;
}
$arr = array("a"=>4, "b"=>2, "c"=>8, "d"=>6);
uasort($arr, "my_sort");
foreach($arr as $key => $value) {
  echo "[" . $key . "] => " . $value;
  echo "<br>";
}
?>
</body>
</html>
[b] => 2
[a] => 4
[d] => 6
[c] => 8