本文翻译自：PHP array delete by value (not key)
I have a PHP array as follows: 我有一个PHP数组，如下所示：
$messages = [312, 401, 1599, 3, ...];
I want to delete the element containing the value $del_val (for example, $del_val=401 ), but I don't know its key. 我想删除包含值$del_val的元素（例如$del_val=401 ），但是我不知道它的键。 This might help: each value can only be there once . 这可能会有所帮助： 每个值只能存在一次 。
I'm looking for the simplest function to perform this task, please. 我正在寻找执行此任务的最简单功能。
#1楼
参考：https://stackoom.com/question/UJZO/PHP数组按值删除-不是键
#2楼
Well, deleting an element from array is basically just set difference with one element. 好吧，从数组中删除一个元素基本上只是与一个元素设置不同 。
array_diff( [312, 401, 15, 401, 3], [401] ) // removing 401 returns [312, 15, 3]
It generalizes nicely, you can remove as many elements as you like at the same time, if you want. 概括性很好，如果需要，您可以同时删除任意多个元素。
Disclaimer: Note that my solution produces a new copy of the array while keeping the old one intact in contrast to the accepted answer which mutates. 免责声明：请注意，我的解决方案会生成一个数组的新副本，同时保持旧副本不变，这与接受的变异答案相反。 Pick the one you need. 选择您需要的那个。
#3楼
$fields = array_flip($fields);
unset($fields['myvalue']);
$fields = array_flip($fields);
#4楼
One interesting way is by using array_keys() : 一种有趣的方法是使用array_keys() ：
foreach (array_keys($messages, 401, true) as $key) {
unset($messages[$key]);
}
The array_keys() function takes two additional parameters to return only keys for a particular value and whether strict checking is required (ie using === for comparison). array_keys()函数使用两个附加参数，仅返回特定值的键以及是否需要严格检查（即，使用===进行比较）。
This can also remove multiple array items with the same value (eg [1, 2, 3, 3, 4] ). 这也可以删除具有相同值的多个数组项（例如[1, 2, 3, 3, 4] ）。
#5楼
Have a look at following code: 看下面的代码：
$arr = array('nice_item', 'remove_me', 'another_liked_item', 'remove_me_also');
You can do: 你可以做：
$arr = array_diff($arr, array('remove_me', 'remove_me_also'));
And that will get you this array: 这将为您提供以下数组：
array('nice_item', 'another_liked_item')
#6楼
To delete multiple values try this one: 要删除多个值，请尝试以下一项：
while (($key = array_search($del_val, $messages)) !== false)
{
unset($messages[$key]);
}
