php如何比较两二维数组
php如何比较两二维数组 ?
PHP array_diff_assoc() 函数
定义和用法
array_diff_assoc() 函数用于比较两个(或更多个)数组的键名和键值 ,并返回差集。
该函数比较两个(或更多个)数组的键名和键值,并返回一个差集数组,该数组包括了所有在被比较的数组(array1)中,但是不在任何其他参数数组(array2 或 array3 等等)中的键名和键值。
语法
array_diff_assoc(array1,array2,array3...);
参数
array1 必需。与其他数组进行比较的第一个数组。
array2 必需。与第一个数组进行比较的数组。
array3,... 可选。与第一个数组进行比较的其他数组。
返回值: 返回数组,该数组包含所有在 array1 中,但是不在任何其他参数数组(array2 或 array3 等等)中的键名和键值。
PHP 版本: 4.3+
例子 1
比较两个数组的键和值,并返回差集:
<?php $a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow"); $a2=array("e"=>"red","f"=>"green","g"=>"blue"); $result=array_diff_assoc($a1,$a2); print_r($result); ?>
运行结果:
Array ( [a] => red [b] => green [c] => blue [d] => yellow )
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