[英]Why does in_array() not work on $_POST?
I'm trying to check that user's submitted data, from $_POST
, has at least the same elements that my passed array has. 我正在尝试检查用户提交的数据,来自
$_POST
,至少具有与我传递的数组相同的元素。 I'm doing it because I will use those elements later by calling $_POST['element']
and I don't like errors about that element doesn't exist (isn't set). 我这样做是因为我稍后会通过调用
$_POST['element']
来使用这些元素,我不喜欢有关该元素的错误不存在(未设置)。 :) :)
I don't want to use something like isset($_POST['x'], $_POST['y'], $_POST['z'])
because each time I need to rewrite $_POST
and it seems unreadable as well. 我不想使用像
isset($_POST['x'], $_POST['y'], $_POST['z'])
这样的东西isset($_POST['x'], $_POST['y'], $_POST['z'])
因为每次我需要重写$_POST
而且它似乎也不可读。
I tried to use in_array(array('x', 'y', 'z'), $_POST)
, but it doesn't work (it returns false
when it should return true
). 我试图用
in_array(array('x', 'y', 'z'), $_POST)
但它不工作(返回false
时,它应该返回true
)。 Any ideas how to make that work? 任何想法如何使这项工作? :) I'm sure that I have empty strings as
$_POST['x']
, $_POST['y']
and $_POST['z']
. :)我确定我的空字符串为
$_POST['x']
, $_POST['y']
和$_POST['z']
。 I even tried to change values of hose three $_POST
elements to something other than empty string - still... doesn'y work as expected. 我甚至试图将软管三个
$_POST
元素的值更改为空字符串以外的其他值 - 仍然...没有按预期工作。 :( :(
Thanks in an advice! 谢谢你的建议! :)
:)
Edit: 编辑:
Just found out that in_array()
checks values, not keys. 刚刚发现
in_array()
检查值,而不是键。 Then, I tried to do like this... 然后,我试着这样做......
in_array(array('title', 'slug', 'content'), array_keys($_POST))
Still, it returns false
. 仍然,它返回
false
。 How does it comes so? 怎么会这样? ;/
; /
Edit #2: 编辑#2:
Okay, here are results of debugging... 好的,这是调试结果......
Incoming $_POST
: 传入
$_POST
:
array(3) {
["title"]=>
string(0) ""
["slug"]=>
string(0) ""
["content"]=>
string(0) ""
}
Result of array_keys($_POST)
: array_keys($_POST)
:
array(3) {
[0]=>
string(5) "title"
[1]=>
string(4) "slug"
[2]=>
string(7) "content"
}
Result of in_array(array('title', 'slug', 'content'), array_keys($_POST))
: in_array(array('title', 'slug', 'content'), array_keys($_POST))
:
bool(false)
The question... why is it false
? 问题......为什么这是
false
? I did all correct, as much as I know. 据我所知,我做的都是正确的。
Edit #3: 编辑#3:
At the end, I created my own method called Arr::keys_exists($keys, $array)
. 最后,我创建了自己的方法,名为
Arr::keys_exists($keys, $array)
。
in_array()
checks to see if a value exists in an array, not a key . in_array()
检查数组中是否存在值 ,而不是键 。 If you want to check to see if a key exists, then you'd want something like... 如果你想检查是否存在密钥,那么你需要像...那样的东西
in_array('x', array_keys($_POST));
or the simpler... 或者更简单......
array_key_exists('x', $_POST);
If you want to check for many keys at once: 如果要一次检查多个键:
$required_keys = array('x'=>1, 'y'=>1, 'z'=>1);
$missing_keys = array_diff_key($required_keys, $_POST);
$missing_keys_count = count($missing_keys);
Because in_array
checks if the needle is in the array exactly. 因为
in_array
检查针是否在阵列中。 See example #3 of the manual-page. 请参见手册页的示例#3。
array_key_exists
cannot work with a key as first argument because array's aren't valid with arrays as keys. array_key_exists
不能使用键作为第一个参数,因为数组对于数组作为键无效。
You want something like all_in_array(array $needles, array $haystack);
你想要像
all_in_array(array $needles, array $haystack);
or array_all_keys_exists(array $keys, array $search);
或
array_all_keys_exists(array $keys, array $search);
which returns whether all elements are in the array. 返回是否所有元素都在数组中。 You can probably implement something like this yourself, or ask for more help here.
你可以自己实现这样的东西,或者在这里寻求更多的帮助。
in_array(array('x', 'y', 'z'), $_POST), but it doesn't work (it returns false when it should return true)
in_array(array('x','y','z'),$ _ POST),但它不起作用(当它返回true时返回false)
No, it shouldn't. 不,它不应该。 Read the manual of in_array .
阅读in_array的手册。
Checks if a value exists in an array
检查数组中是否存在值
Instead you'd like to check array keys. 相反,你想检查数组键。 Get all the keys with array_keys and then use in_array.
使用array_keys获取所有键,然后使用in_array。
With in_array you can test only one value at a time, though, not a whole array of values like you're trying to do. 使用in_array,您一次只能测试一个值,而不是像您尝试的那样完整的值数组。
In other words, if you do: 换句话说,如果你这样做:
in_array(array('title', 'slug', 'content'), array_keys($_POST))
It will to find one element of the keys array containing an array with title, slug and comment, which is not what you want. 它将找到keys数组的一个元素 ,其中包含一个带有title,slug和comment的数组,这不是你想要的。
First of all: 首先:
I don't want to use something like isset($_POST['x'], $_POST['y'], $_POST['z']) because each time I need to rewrite $_POST and it seems unreadable as well.
我不想使用像isset这样的东西($ _ POST ['x'],$ _POST ['y'],$ _POST ['z'])因为每次我需要重写$ _POST而且它似乎也不可读。
You should never change one of the super globals ;) 你永远不应该改变其中一个超级全局变量;)
However, in_array()
searches for values and not for keys 但是,
in_array()
搜索值而不搜索键
in_array(array('x', 'y', 'z'), array_key($_POST))
function getPost( $index, $default = '' )
{
if ( isset( $_POST[ $index ] ) )
{
return $_POST[ $index ];
}
return $default;
}
If you want to ensure the presence of multiple keys, then array_diff
might be applicable: 如果要确保存在多个密钥,则
array_diff
可能适用:
!array_diff(array('title', 'slug', 'content'), array_keys($_POST))
You might also be interested in array_intersect_uassoc
. 您可能也对
array_intersect_uassoc
感兴趣。
@Eric是对的,试试这个 -
in_array(array('title', 'slug', 'content'), array(array_keys($_POST)))
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