Question

Array
    (
        [0] => stdClass Object
            (
                [comment_ID] => 31
                [comment_post_ID] => 16
                [comment_karma] => 0
                [comment_approved] => 1
                [comment_parent] => 0
        )
    [1] => stdClass Object
        (
            [comment_ID] => 32
            [comment_post_ID] => 16
            [comment_karma] => 0
            [comment_approved] => 1
            [comment_parent] => 31
        )

    [2] => stdClass Object
        (
            [comment_ID] => 33
            [comment_post_ID] => 16
            [comment_karma] => 0
            [comment_approved] => 1
            [comment_parent] => 30
        )
    )

    <?
    foreach ($array as $comments)
    {
    $key = array_search ("30", $comments);
    echo $key;
    }
    ?>

我需要检索数组键，它位于[2]数组中的comment_parent 30。我尝试过使用array_search但是我收到了这个错误：

警告：array_search（）期望参数2是数组，给定对象在

感谢。

Answer 1

试试这个..你的数组有对象，所以你必须按对象获取值，并使用下面的逻辑来获取密钥..

foreach ($array as $key=>$obj){
    if($obj->comment_parent == 30){
        break;      
    }
}
echo "Required Key is ==>".$key;

Answer 2

也许您应该按如下方式投射对象

$key = array_search ("30", (array)$comments);

这将解决您的错误，但不会完成您需要的工作。更好地检查@Prashant M Bhavsar的答案

$commentKey = null;
foreach ($array as $key=>$obj)
{
    if(isset($obj->comment_parent) && $obj->comment_parent == 30){
        $commentKey = $key;
        break;
    }
}

对于更复杂的结构或语句，您可以使用array_map函数。

多维数组中的Array_Search

2 个答案: