PHP如何对比两个数组是否相同

第一种方法，降维成字符串：

这种方法真对多维数组，思路是把数组降维成字符串，比如用json_decode(),serialize()等函数转成字符串后再进行比较。

第二种，用PHP自带对比函数，但只能支持二维数组。

比较数组，返回数组的交集（只比较键值） ：array_intersect()

       $a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
       $a2=array("e"=>"red","f"=>"green","g"=>"blue");

       $result=array_intersect($a1,$a2);
       print_r($result);

结果：Array ( [a] => red [b] => green [c] => blue )

比较数组，返回数组的交集（比较键值和键名）：array_intersect_assoc()

        $a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
        $a2=array("e"=>"red","f"=>"green","g"=>"blue");

        $result=array_intersect_assoc($a1,$a2);
        print_r($result);

结果:Array ( )

比较数组，返回数组的交集（只比较键名）:array_intersect_key()

        $a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
        $a2=array("e"=>"red","c"=>"green","g"=>"blue");

        $result=array_intersect_key($a1,$a2);
        print_r($result);

结果：Array ( [c] => blue )

上面的是比较交集，比较差集的话，请使用array_diff_assoc()函数