PHP使用preg_match或regex作为array_search的值或array_keys_exist的键 [英] PHP using preg_match or regex as value for array_search or the key for array_keys_exist

问题描述

我想知道是否可以在 array_seach()或 array_keys_exist 中使用正则表达式或 preg_match()吗?

I was wondering if it was possible to use regex or preg_match() in array_seach() or array_keys_exist?

即. array_keys_exist($ array，"^ \ d + $")匹配所有纯数字字符的键

ie. array_keys_exist($array,"^\d+$") to match all keys that are solely numeric characters

推荐答案

我不知道它是否完全适合您的需求，但是您应该看看 array_keys 的返回值使用 preg_grep 对键进行相同的操作代码> .

I don't know whether it suits your needs exactly, but you should have a look at the preg_grep function, which will check an array of strings against a regex and return all matching array elements. You could do same with the keys, by using preg_grep on the return value of array_keys.

这与 array_search / array_key_exists 不同，它们在找到匹配项后停止，因为可能只有一个匹配项.另一方面，使用正则表达式时，可能有许多满足条件的元素，因此 preg_grep 将返回所有元素.

This is different from array_search / array_key_exists in the respect, that these stop after they have found a match, because there may only be one match. With regex on the other hand there may be many elements satisfying the condition, so preg_grep will return all of them.

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