PHP 中的 array_diff_uassoc()函数

<?php
   function key_compare_func($a, $b) {
      if ($a === $b) {
         return 0;
      }
      return ($a > $b)? 1:-1;
   }
	
   $input1=array("a" => "green", "b" => "brown", "c" => "blue", "red");
   $input2=array("a" => "green", "yellow", "red");
   
   $result=array_diff_uassoc($input1, $input2, "key_compare_func");
   
   print_r($result);

?>