php - 试图获取非对象错误的属性

Question

我试图弄清楚为什么我一直在尝试获取非对象错误的属性。使用我创建的数组。我创建了数组并正在对其进行检索，从我的对象数组的外观来看，这些属性确实存在。

我收到了这方面的错误：

// Separates each of the last 5 pesonal messages
foreach ($last_5_personal_messages AS $message)
{
    echo '<li>';
    echo '<span class="icon avatar"><img src="'.$message->sender_avatar.'" alt="" /></span>';
    echo '<span class="name"><a href="'.$site_url.'/personalmessages/viewmessage/'.$message->message_id.'"><strong>'.$message->sender_name.'</strong></a><span class="time">'.$message->datetime_sent.' ago</span></span>';
    echo '<span class="msg">'.$message->subject.'</span>';
    echo '</li>';
}
?>


Array
(
[0] => stdClass Object
    (
        [message_id] => 1
        [subject] => Test Message
        [datetime_sent] => 2 weeks
        [attachments] => 
        [priority] => 0
        [message_content] => Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
        [message_read] => 0
        [is_favorite] => 0
        [sender_name] => Mike Scott
        [sender_email_address] => myemail@myemail.com
        [sender_avatar] => http://dev.myserver.com/assets/themes/supr/images/avatars/avatar5.jpg
    )

[1] => stdClass Object
    (
        [message_id] => 2
        [subject] => Testing PM Message
        [datetime_sent] => 3 weeks
        [attachments] => Array
            (
                [0] => Array
                    (
                        [file_name] => file1.jpg
                        [is_file] => 1
                        [file_size] => 7.01 KB
                        [file_location] => assets/downloads/file1.jpg
                    )

                [1] => Array
                    (
                        [file_name] => file2.jpg
                        [is_file] => 
                    )

                [2] => Array
                    (
                        [file_name] => file3.jpg
                        [is_file] => 
                    )

            )

        [priority] => 0
        [message_content] => This is jsut a test of the personal message system!
        [message_read] => 0
        [is_favorite] => 0
        [sender_name] => Kevin Scott
        [sender_email_address] => myemail@server.com
        [sender_avatar] => http://dev.myserver.com/assets/themes/supr/images/avatars/avatar5.jpg
    )

[2] => stdClass Object
    (
        [message_id] => 3
        [subject] => Testing Whatever
        [datetime_sent] => 1 week
        [attachments] => 
        [priority] => 0
        [message_content] => Testing Message Content
        [message_read] => 0
        [is_favorite] => 0
        [sender_name] => Frank Scott
        [sender_email_address] => frankscott@testemail.com
        [sender_avatar] => http://dev.myserver.com/assets/themes/supr/images/avatars/avatar.jpg
    )

[total_unread_messages] => 3
)

Answer 1

GBD 是对的，这是因为total_unread_messages键不包含作为其值的对象，所以您会收到此警告。

total_unread_messages如果您不想if( is_object())对每个循环迭代进行检查，您也可以手动迭代该数组，使用其中的信息对您有利。像这样的东西应该工作：

for( $i = 0; $i < $last_5_personal_messages['total_unread_messages'] && $i < 5; $i++) {
    $message = $last_5_personal_messages[$i];
     echo '<li>';
     // ....
}

或者您可以unset()在迭代之前使用该值（完成后可以选择将其放回）：

unset( $last_5_personal_messages['total_unread_messages']);
foreach( $last_5_personal_messages as $message) {
    // ...
}

Answer 2

因为您在数组中有键“total_unread_messages”，它没有对象作为值，所以在 foreach 时跳过该值

foreach ($last_5_personal_messages AS $message)
{
    if(!is_object($message)){
      continue;
    }
    echo '<li>';
    echo '<span class="icon avatar"><img src="'.$message->sender_avatar.'" alt="" /></span>';
    echo '<span class="name"><a href="'.$site_url.'/personalmessages/viewmessage/'.$message->message_id.'"><strong>'.$message->sender_name.'</strong></a><span class="time">'.$message->datetime_sent.' ago</span></span>';
    echo '<span class="msg">'.$message->subject.'</span>';
    echo '</li>';

}

另一种方式

for($i=0;$i<$last_5_personal_messages['total_unread_messages'];$i++)
{
   $message = $last_5_personal_messages[$i];

    echo '<li>';
    echo '<span class="icon avatar"><img src="'.$message->sender_avatar.'" alt="" /></span>';
    echo '<span class="name"><a href="'.$site_url.'/personalmessages/viewmessage/'.$message->message_id.'"><strong>'.$message->sender_name.'</strong></a><span class="time">'.$message->datetime_sent.' ago</span></span>';
    echo '<span class="msg">'.$message->subject.'</span>';
    echo '</li>';
}