PHP的搜索数组键，并获得价值

问题描述

我想知道在数组中搜索键并返回其值的最佳方法是什么.类似于array_search，但用于密钥.循环是最好的方法吗?

I was wondering what is the best way to search keys in an array and return it's value. Something like array_search but for keys. Would a loop be the best way?

数组:

Array([20120425] => 409 [20120426] => 610 [20120427] => 277
      [20120428] => 114 [20120429] => 32 [20120430] => 304
      [20120501] => 828 [20120502] => 803 [20120503] => 276 [20120504] => 162)

我要搜索的值:20120504

Value I am searching for : 20120504

推荐答案

密钥已经是...嗯... 密钥

The key is already the ... ehm ... key

echo $array[20120504];

如果不确定密钥是否存在，请对其进行测试

If you are unsure, if the key exists, test for it

$key = 20120504;
$result = isset($array[$key]) ? $array[$key] : null;

次要添加:

$result = @$array[$key] ?: null;

有人可能会说@是不好的，但要严肃对待:这更易读和直接，不是吗?

One may argue, that @ is bad, but keep it serious: This is more readable and straight forward, isn't?

更新:使用PHP7，我的上一个示例可以在没有消音器的情况下实现

Update: With PHP7 my previous example is possible without the error-silencer

$result = $array[$key] ?? null;

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