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【函数功能】

该函数用两个自定义函数比较两个（或更多个）数组的键名键值 ，并返回差集。

【函数语法】

array_udiff_uassoc (array $array1, array $array2, array $_ = null, $value_compare_func, $key_compare_func)

【参数说明】

【演示程序】

<?php
/**
 * array_udiff_uassoc (array $array1, array $array2, array $_ = null, $value_compare_func, $key_compare_func)
 * **/
 function function_key($a,$b){
    if ($a===$b)
    {
        return 0;
    }
    return ($a>$b)?-1:1;
}
function function_value($a,$b){
    if ($a===$b)
    {
        return 0;
    }
    return ($a>$b)?-1:1;
}
$a1=array("a"=>"red","b"=>"green","c"=>"blue");
$a2=array("a"=>"red","e"=>"black","f"=>"blue");
$result=array_udiff_uassoc($a1,$a2,"function_value","function_key");
print_r($result);
?>

【输出结果】

Array ( [b] => green [c] => blue )

【特别注意】

1.可用一个或任意多个数组与第一个数组进行比较。
2.该函数将键值用于比较，只有当键名键值都相同时才会被剔除。
3.PHP 版本：5.0+。

【原版定义】

/**
 * Computes the difference of arrays with additional index check, compares data and indexes by a callback function
 * @link http://www.php.net/manual/en/function.array-udiff-uassoc.php
 * @param array1 array <p>
 * The first array.
 * </p>
 * @param array2 array <p>
 * The second array.
 * </p>
 * @param _ array[optional] 
 * @param value_compare_func callable <p>
 * The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second.
 * </p>
 * &callback.cmp;
 * @param key_compare_func callable <p>
 * The comparison of keys (indices) is done also by the callback function
 * key_compare_func. This behaviour is unlike what
 * array_udiff_assoc does, since the latter compares
 * the indices by using an internal function.
 * </p>
 * @return array an array containing all the values from
 * array1 that are not present in any of the other
 * arguments.
 */

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