?php
function FindNumsAppearOnce($array)
{
  // write code here
  // return list, 比如[a,b]，其中ab是出现一次的两个数字
  $count = array_count_values($array);
  foreach($count as $k=>$v) {
    if($v == 1) {
      $new_arr[] = $k;
    }
  }
  return $new_arr;
}
$arr=array('22','44','66','11','11','44','33');
print_r(FindNumsAppearOnce($arr));

Array
(
  [0] => 22
  [1] => 66
  [2] => 33
)