PHP检查数组的任何键都有null值

Question

我有一个类似

的数组

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

我需要以最快的方式检查此数组的任何键是否包含空值。

Answer 1

$key = array_search(null, $question);

Answer 2

试试这个：

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

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

}

Answer 3

if (in_array(NULL, $question)) {

}