如何按条件过滤数组 [英] How to filter an array by a condition

问题描述

我有一个这样的数组:

array("a" => 2, "b" => 4, "c" => 2, "d" => 5, "e" => 6, "f" => 2)

现在我想通过某种条件过滤该数组，只保留值等于 2 的元素并删除值不是 2 的所有元素.

Now I want to filter that array by some condition and only keep the elements where the value is equal to 2 and delete all elements where the value is NOT 2.

所以我的预期结果数组是:

So my expected result array would be:

array("a" => 2, "c" => 2, "f" => 2)

_{注意:我想保留原始数组中的键.}

我怎样才能用 PHP 做到这一点?有什么内置函数吗?

How can I do that with PHP? Any built-in functions?

推荐答案

$fullArray = array('a'=>2,'b'=>4,'c'=>2,'d'=>5,'e'=>6,'f'=>2);


function filterArray($value){
    return ($value == 2);
}

$filteredArray = array_filter($fullArray, 'filterArray');

foreach($filteredArray as $k => $v){
    echo "$k = $v";
}

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