selection sort using php

<?php
$arr = array(2,3,4,5,1,8,11,0);
// function selection_sort(&$arr) {
   $n = count($arr);
   for($i = 0; $i < count($arr); $i++) {
      $min = $i;
      for($j = $i + 1; $j < $n; $j++)
         if($arr[$j] < $arr[$min])
            $min = $j;
      $tmp = $arr[$min];
      $arr[$min] = $arr[$i];
      $arr[$i] = $tmp;
   }
// }
print_r($arr);
?>