我不明白为什么，错误说：
警告：在第134行的C：\ xampp \ htdocs \ twitter \ core \ ajax \ popuptweets.php中为foreach（）提供的参数无效，我没有看到任何错误或者我是盲目的！
popuptweets.php 代码
<?php
include '../init.php';
if (isset($_POST['showpopup']) && !empty($_POST['showpopup'])) {
$tweetID = $_POST['showpopup'];
$user_id = $_SESSION['user_id'];
$tweet = $getFromT->getPopupTweet($tweetID);
$user = $getFromU->userData($user_id);
$likes = $getFromT->likes($user_id, $tweetID);
$retweet = $getFromT->checkRetweet($tweetID, $user_id);
$comments = $getFromT->comments($tweetID);
?>
<div class="tweet-show-popup-wrap">
<input type="checkbox" id="tweet-show-popup-wrap">
<div class="wrap4">
<label for="tweet-show-popup-wrap">
<div class="tweet-show-popup-box-cut">
<i class="fa fa-times" aria-hidden="true"></i>
</div>
</label>
<div class="tweet-show-popup-box">
<div class="tweet-show-popup-inner">
<div class="tweet-show-popup-head">
<div class="tweet-show-popup-head-left">
<div class="tweet-show-popup-img">
<img src="<?php echo BASE_URL.$tweet->profileImage;?>"/>
</div>
<div class="tweet-show-popup-name">
<div class="t-s-p-n">
<a href="<?php echo BASE_URL.$tweet->username;?>">
<?php echo $tweet->screenName;?>
</a>
</div>
<div class="t-s-p-n-b">
<a href="<?php echo BASE_URL.$tweet->username;?>">
@<?php echo $tweet->username;?>
</a>
</div>
</div>
</div>
<div class="tweet-show-popup-head-right">
<button class="f-btn"><i class="fa fa-user-plus"></i> Follow </button>
</div>
</div>
<div class="tweet-show-popup-tweet-wrap">
<div class="tweet-show-popup-tweet">
<?php echo $getFromT->getTweetLinks($tweet->status);?>
</div>
<div class="tweet-show-popup-tweet-ifram">
<?php if(!empty($tweet->tweetImage)){?>
<img src="<?php echo BASE_URL.$tweet->tweetImage;?>"/>
<?php }?>
</div>
</div>
<div class="tweet-show-popup-footer-wrap">
<div class="tweet-show-popup-retweet-like">
<div class="tweet-show-popup-retweet-left">
<div class="tweet-retweet-count-wrap">
<div class="tweet-retweet-count-head">
RETWEET
</div>
<div class="tweet-retweet-count-body">
<?php echo $tweet->retweetCount;?>
</div>
</div>
<div class="tweet-like-count-wrap">
<div class="tweet-like-count-head">
LIKES
</div>
<div class="tweet-like-count-body">
<?php echo $tweet->likesCount;?>
</div>
</div>
</div>
<div class="tweet-show-popup-retweet-right">
</div>
</div>
<div class="tweet-show-popup-time">
<span><?php echo $tweet->postedOn;?></span>
</div>
<div class="tweet-show-popup-footer-menu">
<ul>
<?php if($getFromU->loggedIn() === true){
echo '<li><i class="fa fa-share" aria-hidden="true"></i></a></button></li>
<li>'.(($tweet->tweetID === $retweet['retweetID']) ? '<button class="retweeted" data-tweet="'.$tweet->tweetID.'" data-user="'.$tweet->tweetBy.'"><a href="#"><i class="fa fa-retweet" aria-hidden="true"></i><span class="retweetsCount">'.$tweet->retweetCount.'</span></button>' : '<button class="retweet" data-tweet="'.$tweet->tweetID.'" data-user="'.$tweet->tweetBy.'"><a href="#"><i class="fa fa-retweet" aria-hidden="true"></i><span class="retweetsCount">'.(($tweet->retweetCount > 0) ? $tweet->retweetCount : '').'</span></button>').'</li>
<li>'.(($likes['likeOn'] === $tweet->tweetID) ? '<button class="unlike-btn" data-tweet="'.$tweet->tweetID.'" data-user="'.$tweet->tweetBy.'"><i class="fa fa-heart-o" aria-hidden="true"></i><span class="likesCounter">'.$tweet->likesCount.'</span></button>' : '<button class="like-btn" data-tweet="'.$tweet->tweetID.'" data-user="'.$tweet->tweetBy.'"><i class="fa fa-heart" aria-hidden="true"></i><span class="likesCounter">'.(($tweet->likesCount > 0) ? $tweet->likesCount : '').'</span></button>').'</li>
<li>
<a href="#" class="more"><i class="fa fa-ellipsis-h" aria-hidden="true"></i></a>
<ul>
<li><label class="deleteTweet">Delete Tweet</label></li>
</ul>
</li>';
}else{
?>
<li><button type="buttton"><i class="fa fa-share" aria-hidden="true"></i></button></li>
<li><button type="button"><i class="fa fa-retweet" aria-hidden="true"></i><span class="retweetsCount">RETWEET-COUNT</span></button></li>
<li><button type="button"><i class="fa fa-heart" aria-hidden="true"></i><span class="likesCount">LIKES-COUNT</span></button></button></li>
<?php }?>
</ul>
</div>
</div>
</div><!--tweet-show-popup-inner end-->
<?php if($getFromU->loggedIn() === true){?>
<div class="tweet-show-popup-footer-input-wrap">
<div class="tweet-show-popup-footer-input-inner">
<div class="tweet-show-popup-footer-input-left">
<img src="<?php echo BASE_URL.$user->profileImage?>"/>
</div>
<div class="tweet-show-popup-footer-input-right">
<input id="commentField" type="text" name="comment" placeholder="Reply to @<?php echo $tweet->username;?>">
</div>
</div>
<div class="tweet-footer">
<div class="t-fo-left">
<ul>
<li>
<label for="t-show-file"><i class="fa fa-camera" aria-hidden="true"></i></label>
<input type="file" id="t-show-file">
</li>
<li class="error-li">
</li>
</ul>
</div>
<div class="t-fo-right">
<span id="count">140</span>
<input type="submit" id="postComment">
</div>
</div>
</div><!--tweet-show-popup-footer-input-wrap end-->
<?php }?>
<div class="tweet-show-popup-comment-wrap">
<div id="comments">
<?php
foreach ($comments as $comment) {
echo '<div class="tweet-show-popup-comment-box">
<div class="tweet-show-popup-comment-inner">
<div class="tweet-show-popup-comment-head">
<div class="tweet-show-popup-comment-head-left">
<div class="tweet-show-popup-comment-img">
<img src="'.BASE_URL.$comment->profileImage.'">
</div>
</div>
<div class="tweet-show-popup-comment-head-right">
<div class="tweet-show-popup-comment-name-box">
<div class="tweet-show-popup-comment-name-box-name">
<a href="'.BASE_URL.$comment->username.'">'.$comment->screenName.'</a>
</div>
<div class="tweet-show-popup-comment-name-box-tname">
<a href="'.BASE_URL.$comment->username.'">@'.$comment->username.' - '.$comment->commentAt.'</a>
</div>
</div>
<div class="tweet-show-popup-comment-right-tweet">
<p><a href="'.BASE_URL.$tweet->username.'">@'.$tweet->username.'</a> '.$comment->comment.'</p>
</div>
<div class="tweet-show-popup-footer-menu">
<ul>
<li><button><i class="fa fa-share" aria-hidden="true"></i></button></li>
<li><a href="#"><i class="fa fa-heart-o" aria-hidden="true"></i></a></li>
<li>
<a href="#" class="more"><i class="fa fa-ellipsis-h" aria-hidden="true"></i></a>
<ul>
<li><label class="deleteTweet">Delete Tweet</label></li>
</ul>
</li>
</ul>
</div>
</div>
</div>
</div>
<!--TWEET SHOW POPUP COMMENT inner END-->
</div>
';
}
?>
</div>
</div>
<!--tweet-show-popup-box ends-->
</div>
</div>
<?php
}
?>
以及foreach上的错误对此代码的意义
foreach ($comments as $comment) {
echo '<div class="tweet-show-popup-comment-box">
<div class="tweet-show-popup-comment-inner">
<div class="tweet-show-popup-comment-head">
<div class="tweet-show-popup-comment-head-left">
<div class="tweet-show-popup-comment-img">
<img src="'.BASE_URL.$comment->profileImage.'">
</div>
</div>
<div class="tweet-show-popup-comment-head-right">
<div class="tweet-show-popup-comment-name-box">
<div class="tweet-show-popup-comment-name-box-name">
<a href="'.BASE_URL.$comment->username.'">'.$comment->screenName.'</a>
</div>
<div class="tweet-show-popup-comment-name-box-tname">
<a href="'.BASE_URL.$comment->username.'">@'.$comment->username.' - '.$comment->commentAt.'</a>
</div>
</div>
<div class="tweet-show-popup-comment-right-tweet">
<p><a href="'.BASE_URL.$tweet->username.'">@'.$tweet->username.'</a> '.$comment->comment.'</p>
</div>
<div class="tweet-show-popup-footer-menu">
<ul>
<li><button><i class="fa fa-share" aria-hidden="true"></i></button></li>
<li><a href="#"><i class="fa fa-heart-o" aria-hidden="true"></i></a></li>
<li>
<a href="#" class="more"><i class="fa fa-ellipsis-h" aria-hidden="true"></i></a>
<ul>
<li><label class="deleteTweet">Delete Tweet</label></li>
</ul>
</li>
</ul>
</div>
</div>
</div>
</div>
<!--TWEET SHOW POPUP COMMENT inner END-->
</div>
';
}
这里的错误在哪里？
答案 0 :(得分：2)
foreach的参数必须是数组，你需要var_dump（$ comments）来查看它是否是数组。在您的情况下，返回结果可能为null，因此它返回foreach的警告。为确保foreach正常工作，您可以使用：
foreach ((array)$comments as $comment) {
}
答案 1 :(得分：0)
我将你的代码与我的代码进行了比较，发现这一行有所不同：别担心，错误就在那里。
angular:
build: ../angular
container_name: ng
ports:
- "4200:4200"
volumes:
- ../angular:/usr/src/app
- /usr/src/app/node_modules