有些简单的PHP数组相交问题 [英] Somewhat simple PHP array intersection question

问题描述

也许我要疯了，但我可以发誓，有历时两个数组作为参数的PHP核心功能：

Maybe I'm going insane, but I could have sworn that there was an PHP core function which took two arrays as arguments:

$a = array('1', '3');
$b = array('1'=>'apples', '2'=>'oranges', '3'=>'kiwis');

和执行，其中从数组中的值 $ A 检查碰撞与数组键路口 $ B 。返回类似

And performs an intersection where the values from array $a are checked for collisions with the keys in array $b. Returning something like

array('1'=>'apples', '3'=>'kiwis');

有没有这样的功能存在（这是我错过了文档中），或者是有一个非常优化的方式来达到同样的事情？

Does such a function exist (which I missed in the documentation), or is there a very optimized way to achieve the same thing?

推荐答案

尝试使用array_flip {按键开关与他们的价值观}，然后使用array_intersect（）
在你的例子：

try using array_flip {switches keys with their values} and then use array_intersect() on your example :

$c = array_flip($b); // so you have your original b-array
$intersect = array_intersect($a,c);

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