我在第24行收到错误错误说:(注意：尝试在第24行的C：\ xampp \ htdocs \ twitter \ core \ classes \ tweet.php中获取非对象的属性）
这是tweet.php的代码
<?php
类推文扩展了用户{
function __construct($pdo){
$this->pdo = $pdo;
}
public function tweets($user_id){
$stmt = $this->pdo->prepare("SELECT * FROM `tweets` LEFT JOIN `users` ON `tweetBy` = `user_id` WHERE `tweetBy` = :user_id AND `retweetID` = '0' OR `tweetBy` = `user_id` AND `retweetBy` != :user_id");
$stmt->bindParam(":user_id", $user_id, PDO::PARAM_INT);
$stmt->execute();
$tweets = $stmt->fetchAll(PDO::FETCH_OBJ);
foreach ($tweets as $tweet) {
$likes = $this->likes($user_id, $tweet->tweetID);
$retweet = $this->checkRetweet($tweet->tweetID, $user_id);
$user = $this->userData($tweet->retweetBy);
echo '<div class="all-tweet">
<div class="t-show-wrap">
<div class="t-show-inner">
'.(($retweet['retweetID'] === $tweet->tweetID OR $tweet->retweetID > 0) ? '
<div class="t-show-banner">
<div class="t-show-banner-inner">
<span><i class="fa fa-retweet" aria-hidden="true"></i></span><span>'.$user->screenName.' Retweeted</span>
</div>
</div>'
: '').'
'.((!empty($tweet->retweetMsg) && $tweet->tweetID === $retweet['tweetID'] or $tweet->retweetID > 0) ? '
<div class="t-show-head">
<div class="t-show-img">
<img src="'.BASE_URL.$user->profileImage.'"/>
</div>
<div class="t-s-head-content">
<div class="t-h-c-name">
<span><a href="'.BASE_URL.$user->username.'">'.$user->screenName.'</a></span>
<span>@'.$user->username.'</span>
<span>'.$retweet['postedOn'].'</span>
</div>
<div class="t-h-c-dis">
'.$this->getTweetLinks($tweet->retweetMsg).'
</div>
</div>
</div>
<div class="t-s-b-inner">
<div class="t-s-b-inner-in">
<div class="retweet-t-s-b-inner">
'.((!empty($tweet->tweetImage)) ? '
<div class="retweet-t-s-b-inner-left">
<img src="'.BASE_URL.$tweet->tweetImage.'"/>
</div>' : '').'
<div class="retweet-t-s-b-inner-right">
<div class="t-h-c-name">
<span><a href="'.BASE_URL.$tweet->username.'">'.$tweet->screenName.'</a></span>
<span>@'.$tweet->username.'</span>
<span>'.$tweet->postedOn.'</span>
</div>
<div class="retweet-t-s-b-inner-right-text">
'.$tweet->status.'
</div>
</div>
</div>
</div>
</div>' : '
<div class="t-show-popup">
<div class="t-show-head">
<div class="t-show-img">
<img src="'.$tweet->profileImage.'"/>
</div>
<div class="t-s-head-content">
<div class="t-h-c-name">
<span><a href="'.$tweet->username.'">'.$tweet->screenName.'</a></span>
<span>@'.$tweet->username.'</span>
<span>'.$tweet->postedOn.'</span>
</div>
<div class="t-h-c-dis">
'.$this->getTweetLinks($tweet->status).'
</div>
</div>
</div>'.
((!empty($tweet->tweetImage)) ?
'<!--tweet show head end-->
<div class="t-show-body">
<div class="t-s-b-inner">
<div class="t-s-b-inner-in">
<img src="'.$tweet->tweetImage.'" class="imagePopup"/>
</div>
</div>
</div>
<!--tweet show body end-->
' : '').'
</div>').'
<div class="t-show-footer">
<div class="t-s-f-right">
<ul>
<li><button><a href="#"><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) ? $tweet->likesCount : '').'</span></button>').'</li>
<li>
<a href="#" class="more"><i class="fa fa-ellipsis-h" aria-hidden="true"></i></a>
<ul>
<li><label class="deleteTweet">Delete Tweet</label></li>
</ul>
</li>
</ul>
</div>
</div>
</div>
</div>
</div>';
}
}
public function getTrendByHash($hashtag){
$stmt = $this->pdo->prepare("SELECT * FROM `trends` WHERE `hashtag` LIKE :hashtag LIMIT 5");
$stmt->bindValue(':hashtag', $hashtag.'%');
$stmt->execute();
return $stmt->fetchAll(PDO::FETCH_OBJ);
}
public function getMention($mention){
$stmt = $this->pdo->prepare("SELECT `user_id`,`username`,`screenName`,`profileImage` FROM `users` WHERE `username` LIKE :mention OR `screenName` LIKE :mention LIMIT 5");
$stmt->bindValue(':mention', $mention. '%');
$stmt->execute();
return $stmt->fetchAll(PDO::FETCH_OBJ);
}
public function addTrend($hashtag){
preg_match_all("/#+([a-zA-Z0-9_]+)/i", $hashtag, $matches);
if ($matches) {
$result = array_values($matches[1]);
}
$sql = "INSERT INTO `trends` (`hashtag`,`createdOn`) VALUES(:hashtag, CURRENT_TIMESTAMP)";
foreach ($result as $trend) {
if ($stmt = $this->pdo->prepare($sql)){
$stmt->execute(array(':hashtag' => $trend));
}
}
}
public function getTweetLinks($tweet){
$tweet = preg_replace("/(https?:\/\/)([\w]+.)([\w\.]+)/", "<a href='$0' target='_blink'>$0</a>", $tweet);
$tweet = preg_replace("/#([\w]+)/", "<a href='".BASE_URL."hashtag/$1'>$0</a>", $tweet);
$tweet = preg_replace("/@([\w]+)/", "<a href='".BASE_URL."$1'>$0</a>", $tweet);
return $tweet;
}
public function getPopupTweet($tweet_id){
$stmt = $this->pdo->prepare("SELECT * FROM `tweets`, `users` WHERE `tweetID` = :tweet_id AND `tweetBy` = `user_id`");
$stmt->bindParam(":tweet_id", $tweet_id, PDO::PARAM_INT);
$stmt->execute();
return $stmt->fetch(PDO::FETCH_OBJ);
}
public function retweet($tweet_id, $user_id, $get_id, $comment){
$stmt = $this->pdo->prepare("UPDATE `tweets` SET `retweetCount` = `retweetCount` +1 WHERE `tweetID` = :tweet_id");
$stmt->bindParam(":tweet_id", $tweet_id, PDO::PARAM_INT);
$stmt->execute();
$stmt = $this->pdo->prepare("INSERT INTO `tweets` (`status`, `tweetBy`,`tweetImage`, `retweetID`, `retweetBy`, `postedOn`,`likesCount`,`retweetCount`,`retweetMsg`) SELECT `status`,`tweetBy`,`tweetImage`,`tweetID`,:user_id,CURRENT_TIMESTAMP,`likesCount`,`retweetCount`,:retweetMsg FROM `tweets` WHERE `tweetID` = :tweet_id");
$stmt->bindParam(":user_id", $user_id, PDO::PARAM_INT);
$stmt->bindParam(":retweetMsg", $comment, PDO::PARAM_STR);
$stmt->bindParam(":tweet_id", $tweet_id, PDO::PARAM_INT);
$stmt->execute();
}
public function checkRetweet($tweet_id, $user_id){
$stmt = $this->pdo->prepare("SELECT * FROM `tweets` WHERE `retweetID` = :tweet_id AND `retweetBy` = :user_id OR `tweetID` = :tweet_id AND `retweetBy` = :user_id");
$stmt->bindParam(":tweet_id", $tweet_id, PDO::PARAM_INT);
$stmt->bindParam(":user_id", $user_id, PDO::PARAM_INT);
$stmt->execute();
return $stmt->fetch(PDO::FETCH_ASSOC);
}
public function addLike($user_id, $tweet_id, $get_id){
$stmt = $this->pdo->prepare("UPDATE `tweets` SET `likesCount` = `likesCount` +1 WHERE `tweetID` = :tweet_id");
$stmt->bindParam(":tweet_id", $tweet_id, PDO::PARAM_INT);
$stmt->execute();
$this->create('likes', array('likeBy' => $user_id, 'likeOn' => $tweet_id));
}
public function unlike($user_id, $tweet_id, $get_id){
$stmt = $this->pdo->prepare("UPDATE `tweets` SET `likesCount` = `likesCount` -1 WHERE `tweetID` = :tweet_id");
$stmt->bindParam(":tweet_id", $tweet_id, PDO::PARAM_INT);
$stmt->execute();
$stmt = $this->pdo->prepare("DELETE FROM `likes` WHERE `likeBy` = :user_id AND `likeOn` = :tweet_id");
$stmt->bindParam(":user_id", $user_id, PDO::PARAM_INT);
$stmt->bindParam(":tweet_id", $tweet_id, PDO::PARAM_INT);
$stmt->execute();
}
public function likes($user_id, $tweet_id){
$stmt = $this->pdo->prepare("SELECT * FROM `likes` WHERE `likeBy` = :user_id AND `likeOn` = :tweet_id");
$stmt->bindParam(":user_id", $user_id, PDO::PARAM_INT);
$stmt->bindParam(":tweet_id", $tweet_id, PDO::PARAM_INT);
$stmt->execute();
return $stmt->fetch(PDO::FETCH_ASSOC);
}
} ？＆GT;
和第24行表示此行
<span><i class="fa fa-retweet" aria-hidden="true"></i></span><span>'.$user->screenName.' Retweeted</span>
我不知道究竟是什么问题，有人帮忙吗？
答案 0 :(得分：0)
在将 $ user 用作对象之前检查 $ user 的可用性：
foreach ($tweets as $tweet) {
$likes = $this->likes($user_id, $tweet->tweetID);
$retweet = $this->checkRetweet($tweet->tweetID, $user_id);
$user = $this->userData($tweet->retweetBy);
echo '<div class="all-tweet">
<div class="t-show-wrap">
<div class="t-show-inner">
'.(($user && ($retweet['retweetID'] === $tweet->tweetID OR $tweet->retweetID > 0)) ? '
<div class="t-show-banner">
<div class="t-show-banner-inner">
<span><i class="fa fa-retweet" aria-hidden="true"></i></span><span>'.$user->screenName.' Retweeted</span>
</div>
</div>'
: '').'
'.(($user && !empty($tweet->retweetMsg) && $tweet->tweetID === $retweet['tweetID'] or $tweet->retweetID > 0) ? '
<div class="t-show-head">
<div class="t-show-img">
<img src="'.BASE_URL.$user->profileImage.'"/>
</div>
<div class="t-s-head-content">
<div class="t-h-c-name">
<span><a href="'.BASE_URL.$user->username.'">'.$user->screenName.'</a></span>
<span>@'.$user->username.'</span>
<span>'.$retweet['postedOn'].'</span>
</div>
<div class="t-h-c-dis">
'.$this->getTweetLinks($tweet->retweetMsg).'
</div>
</div>
</div>
<div class="t-s-b-inner">
<div class="t-s-b-inner-in">
<div class="retweet-t-s-b-inner">
'.((!empty($tweet->tweetImage)) ? '
<div class="retweet-t-s-b-inner-left">
<img src="'.BASE_URL.$tweet->tweetImage.'"/>
</div>' : '').'
<div class="retweet-t-s-b-inner-right">
<div class="t-h-c-name">
<span><a href="'.BASE_URL.$tweet->username.'">'.$tweet->screenName.'</a></span>
<span>@'.$tweet->username.'</span>
<span>'.$tweet->postedOn.'</span>
</div>
<div class="retweet-t-s-b-inner-right-text">
'.$tweet->status.'
</div>
</div>
</div>
</div>
</div>' : '
<div class="t-show-popup">
<div class="t-show-head">
<div class="t-show-img">
<img src="'.$tweet->profileImage.'"/>
</div>
<div class="t-s-head-content">
<div class="t-h-c-name">
<span><a href="'.$tweet->username.'">'.$tweet->screenName.'</a></span>
<span>@'.$tweet->username.'</span>
<span>'.$tweet->postedOn.'</span>
</div>
<div class="t-h-c-dis">
'.$this->getTweetLinks($tweet->status).'
</div>
</div>
</div>'.
((!empty($tweet->tweetImage)) ?
'<!--tweet show head end-->
<div class="t-show-body">
<div class="t-s-b-inner">
<div class="t-s-b-inner-in">
<img src="'.$tweet->tweetImage.'" class="imagePopup"/>
</div>
</div>
</div>
<!--tweet show body end-->
' : '').'
</div>').'
<div class="t-show-footer">
<div class="t-s-f-right">
<ul>
<li><button><a href="#"><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>
</ul>
</div>
</div>
</div>
</div>
</div>';
}