why this is Invalid argument supplied for foreach()? - php

Question

I don't understand why, the error says :
Warning: Invalid argument supplied for foreach() in C:\xampp\htdocs\twitter\core\ajax\popuptweets.php on line 134 , and I don't see any error or maybe I'm blind !!
popuptweets.php code
<?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) ? $tweet->likesCount : '').'</span></button>').'</li>
<li>
<i class="fa fa-ellipsis-h" aria-hidden="true"></i>
<ul>
<li><label class="deleteTweet">Delete Tweet</label></li>
</ul>
</li>';
}else{
?>
<li><button type="buttton"><i class="fa fa-share" aria-hidden="true"></i></button></li>
<li><button type="button"><i class="fa fa-retweet" aria-hidden="true"></i><span class="retweetsCount">RETWEET-COUNT</span></button></li>
<li><button type="button"><i class="fa fa-heart" aria-hidden="true"></i><span class="likesCount">LIKES-COUNT</span></button></button></li>
<?php }?>
</ul>
</div>
</div>
</div><!--tweet-show-popup-inner end-->
<?php if($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">
'.$comment->screenName.'
</div>
<div class="tweet-show-popup-comment-name-box-tname">
#'.$comment->username.' - '.$comment->commentAt.'
</div>
</div>
<div class="tweet-show-popup-comment-right-tweet">
<p>#'.$tweet->username.' '.$comment->comment.'</p>
</div>
<div class="tweet-show-popup-footer-menu">
<ul>
<li><button><i class="fa fa-share" aria-hidden="true"></i></button></li>
<li><i class="fa fa-heart-o" aria-hidden="true"></i></li>
<li>
<i class="fa fa-ellipsis-h" aria-hidden="true"></i>
<ul>
<li><label class="deleteTweet">Delete Tweet</label></li>
</ul>
</li>
</ul>
</div>
</div>
</div>
</div>
<!--TWEET SHOW POPUP COMMENT inner END-->
</div>
';
}
?>
</div>
</div>
<!--tweet-show-popup-box ends-->
</div>
</div>
<?php
}
?>
and the error on foreach that's means on this code
foreach ($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">
'.$comment->screenName.'
</div>
<div class="tweet-show-popup-comment-name-box-tname">
#'.$comment->username.' - '.$comment->commentAt.'
</div>
</div>
<div class="tweet-show-popup-comment-right-tweet">
<p>#'.$tweet->username.' '.$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><i class="fa fa-heart-o" aria-hidden="true"></i></li>
<li>
<i class="fa fa-ellipsis-h" aria-hidden="true"></i>
<ul>
<li><label class="deleteTweet">Delete Tweet</label></li>
</ul>
</li>
</ul>
</div>
</div>
</div>
</div>
<!--TWEET SHOW POPUP COMMENT inner END-->
</div>
';
}
where is the error here ?

Answer 1

Arguments for foreach must be an array, you need to var_dump($comments) to see whether it's an array or not. In your case, returning result may be null so it returns warning for foreach. To ensure the foreach working, you may use this:
foreach ((array)$comments as $comment) {
}

Answer 2

I compared your code with mine and found a difference in this line: Do not worry, the error is there.
<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) ? $tweet->retweetCount : '') .'</span></button>' ).'<button class="retweet" data-tweet="'.$tweet->tweetID.'" data-user="'.$tweet->tweetBy.'"><a href="#"><i class="fa fa-retweet" aria-hidden="true"></i><span class="retweetsCount"></span></button>
</li>