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PHP检查数组的任何键是否为空值

[英]PHP check any key of array has null value

I have a array like我有一个像

$question = array(
'description'=>'some description',
'answer_one'=>'some answer',
'answer_two' => NULL)

I need to check any key of this array contains null value in quickest way.我需要以最快的方式检查该数组的任何键是否包含空值。

$key = array_search(null, $question);

Try this:尝试这个:

$question = array(
'description'=>'some description',
'answer_one'=>'some answer',
'answer_two' => NULL);

foreach ($question as $key => $value) {
    if ($value == "") {
echo $key . " is empty!";
}

}
if (in_array(NULL, $question)) {

}

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