php - 查找数组是否包含元素 [英] php - find if an array contains an element

问题描述

我有一个只有 id 列表的数组，如下所示:

I have an array with just a list of ids, like so:

$my_array = array(
 12, 17, 99, 23
);

现在我知道我可能会这样做:

Now I know I could probably do something like:

function in_array($haystack = array(), $needle = NULL)
{
 foreach($haystack as $id)
 {
  if ($id == $needle)
  {return TRUE;}
  else
  {return FALSE;}
 }
}

但似乎已经构建了一个函数.我可以用什么?

but it seems like there's probably already a function built. What could I use?

推荐答案

不需要创建一个，它已经存在，并且与您正在使用的名称相同:in_array 也是.

No need to create one, it is already there co-incidentally with the same name you are using: in_array too.

示例:

if (in_array('foo', $array)){
  // foo is in the array
}

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