Definition and Usage
定义和用法

The array_diff_key() function compares two or more arrays, and returns an array with the keys and values from the first array, only if the key is not present in any of the other arrays.
array_diff_assoc()函数首先对两个或多个数组进行比较；如果第一个数组中的键并未在其他数组中出现，那么就返回这个未出现的键。

Syntax
语法

array_diff_key(array1,array2,array3...)

Tips and Notes
提示和注意点

Tip: You can compare the first array with one array, or as many as you like.
提示：你可以使用一个或多个数组与第一个数组进行比较。

Note: Only the key is used in the comparison.
注意：仅对数组中的键进行比较。

Example
案例

<?php
$a1=array(0=>"Cat",1=>"Dog",2=>"Horse");
$a2=array(2=>"Bird",3=>"Rat",4=>"Fish");
$a3=array(5=>"Horse",6=>"Dog",7=>"Bird");
print_r(array_diff_key($a1,$a2,$a3));
?> 

The output of the code above will be:
上述代码将输出下面的结果：

Array ( [0] => Cat [1] => Dog )

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