从YouTube APIv3中查找每个多维错误

Question

我试图获得一个Youtube频道的信息(频道名称，描述，缩略图等)与以下PHP:

                $json_file3 = file_get_contents($query);
                $jfo3 = json_decode($json_file3,true);          
                foreach($jfo3 as $lv1) {
                    foreach($lv1 as $lv2) {
                        $yt_id = $lv2['id'];
                        $display_name = $lv2['snippet']['title'];
                        $description = nl2br($lv2['snippet']['description']);
                        $yt_thumbnail = $lv2['snippet']['thumbnails']['high']['url'];
                    }
                }

这是一个来自youtube api的示例结果:

    Array
    (
        [0] => youtube#channelListResponse
        [1] => "dhbhlDw5j8dK10GxeV_UG6RSReM/dZxvylPf_SlO1WIRGaE3T4aYrfY"
        [2] => Array
            (
                [totalResults] => 1
                [resultsPerPage] => 1
            )
        [3] => Array
            (
                [0] => Array
                    (
                        [kind] => youtube#channel
                        [etag] => "dhbhlDw5j8dK10GxeV_UG6RSReM/XRhOiR-keld6-bc_ogKZ75nTTTs"
                        [id] => UCi7GJNg51C3jgmYTUwqoUXA
                        [snippet] => Array
                            (
                                [title] => Team Coco
                                [description] => Conan O'Brien presents: the official YouTube channel for CONAN on TBS.
                                [publishedAt] => 2008-06-23T02:45:04.000Z
                                [thumbnails] => Array
                                    (
                                        [default] => Array
                                            (
                                                [url] => https://yt3.ggpht.com/-fl-1HlAzrrI/AAAAAAAAAAI/AAAAAAAAAAA/pYLiLlQWlTE/s88-c-k-no/photo.jpg
                                            )
                                        [medium] => Array
                                            (
                                                [url] => https://yt3.ggpht.com/-fl-1HlAzrrI/AAAAAAAAAAI/AAAAAAAAAAA/pYLiLlQWlTE/s240-c-k-no/photo.jpg
                                            )
                                        [high] => Array
                                            (
                                                [url] => https://yt3.ggpht.com/-fl-1HlAzrrI/AAAAAAAAAAI/AAAAAAAAAAA/pYLiLlQWlTE/s240-c-k-no/photo.jpg
                                            )
                                    )
                                [localized] => Array
                                    (
                                        [title] => Team Coco
                                        [description] => Conan O'Brien presents: the official YouTube channel for CONAN on TBS.
                                    )
                            )
                        [contentDetails] => Array
                            (
                                [relatedPlaylists] => Array
                                    (
                                        [likes] => LLi7GJNg51C3jgmYTUwqoUXA
                                        [favorites] => FLi7GJNg51C3jgmYTUwqoUXA
                                        [uploads] => UUi7GJNg51C3jgmYTUwqoUXA
                                    )
                                [googlePlusUserId] => 105163107119743094340
                            )
                        [statistics] => Array
                            (
                                [viewCount] => 1464321910
                                [commentCount] => 5760
                                [subscriberCount] => 2822923
                                [hiddenSubscriberCount] => 
                                [videoCount] => 3364
                            )
                        [status] => Array
                            (
                                [privacyStatus] => public
                                [isLinked] => 1
                                [longUploadsStatus] => longUploadsUnspecified
                            )
                    )
            )
    )

它很好地输出了我需要的所有变量，除了它还显示了这个错误:

Warning: Invalid argument supplied for foreach() in /home/vividd6/public_html/_project/charmuu/development/cms/profile_form.php on line 100

谁能告诉我如何解决这个问题?这是我第一次使用多维数组。提前感谢!

Answer 1

在你的数组中，第一个元素:

Array
(
    [0] => youtube#channelListResponse

不是数组。foreach循环试图遍历那个，它导致了一个错误。执行一个简单的检查，以确保要循环遍历的元素是一个数组:

foreach($jfo3 as $lv1) {
    if ( is_array($lv1) ) {
        foreach($lv1 as $lv2) {
            $yt_id = $lv2['id'];
            $display_name = $lv2['snippet']['title'];
            $description = nl2br($lv2['snippet']['description']);
            $yt_thumbnail = $lv2['snippet']['thumbnails']['high']['url'];
        }
    }
}

但是您真正想要的是这个(注意，当它循环遍历数组时，$yt_id, $display_name, $description和$yt_thumbnail将被覆盖)。如果你只想从你的回复中得到一个视频，看看最底部的答案，将为你节省很多麻烦。

$json_file3 = file_get_contents($query);
$jfo3 = json_decode($json_file3,true);          
//$lv1[3] contains the array you're looking for.
foreach($jfo3 as $lv1[3]) {
    foreach($lv1 as $lv2) {
        $yt_id = $lv2['id'];
        $display_name = $lv2['snippet']['title'];
        $description = nl2br($lv2['snippet']['description']);
        $yt_thumbnail = $lv2['snippet']['thumbnails']['high']['url'];
    }
}

如上所述，如果您只查找第一个视频，则不需要foreach循环。就用这个:

$json_file3 = file_get_contents($query);
$jfo3 = json_decode($json_file3,true); 
$video = $jfo3[3][0];
$yt_id = $video['id'];
$display_name = $video['snippet']['title'];
$description = nl2br($video['snippet']['description']);
$yt_thumbnail = $video['snippet']['thumbnails']['high'];

Answer 2

您是否尝试在第一次foreach之后打印变量$lvl1 ?你确定变量总是一个数组吗?

使用is_array来验证变量是否为数组。

你可以使用print_r来检查变量的内容

Answer 3

您似乎正在尝试查找一个非数组。例如

[1] => "dhbhlDw5j8dK10GxeV_UG6RSReM/dZxvylPf_SlO1WIRGaE3T4aYrfY"

不是数组。您可以使用is_array()函数来验证项是否为数组。