我创建了这个社交网站http://friendquest.rf.gd。我在新闻提要中遇到问题，无法解决。所以一切正常，但不是我想要的方式！我制作了一个称为发布和转发的SQL表，发布是用户输入以显示在我网站的新闻提要中的数据，转发的工作方式类似于Twitter上的共享按钮或转发按钮。
现在我希望两个表同时显示。
例如，我发布了一个ID为31的帖子。现在，我的一个朋友转发了ID 31，并按其显示的时间排序-
为帖子ID 31重新发送ID 3
职位编号33
帖子ID 32
帖子ID 31
重新发布完成后，我的代码如何显示数据-
帖子ID 33
帖子ID 32
将ID 31重新发布为ID 31
帖子ID 31
我不知道如何根据发布的时间在顶部获得转发。这是我的转发代码
public function getRepostsPosts($post_id, $first_name, $last_name, $body, $imageDiv, $orig_poster, $imagePath){
$query = mysqli_query($this->con, "SELECT * FROM reposts WHERE post_id='$post_id'");
$html = "";
if(mysqli_num_rows($query) > 0){
while($row = mysqli_fetch_array($query)){
$repost_body = $row['body'];
$repost_by = $row['repost_by'];
$users_query = mysqli_query($this->con, "SELECT * FROM users WHERE username='$repost_by'");
$users_row = mysqli_fetch_array($users_query);
$reposted_first_name = $users_row['first_name'];
$reposted_last_name = $users_row['last_name'];
$num = mysqli_num_rows($query);
if($this->user_obj->isFriend($repost_by)){
$link = "<a href='$repost_by'> $reposted_first_name $reposted_last_name </a>";
}
else{
$link = "$reposted_first_name $reposted_last_name";
}
if($repost_body != ""){
$body_html = "<br>
<p>And said \"$repost_body\".</p>
<br>";
}
else{
$body_html = "";
}
$html .= "<div class='status_post'>
<div class='reposted_by' style='color:#ACACAC;'>
$link Reposted <a href='$orig_poster'>$first_name $last_name</a>'s <a href='post.php?id=$post_id'>Post</a>
$body_html
<div id='repost_body' onclick='location.href = \"post.php?id=$post_id\"'>
$body
<br>
$imageDiv
<br>
<br>
</div>
</div>
</div>
<div id='myModal$post_id' class='imageModal' style='display: none'>
<div class='modalContent'>
<img src='$imagePath' class='modalImage'>
<br>
<button class='button cursor' onclick='closeModal$post_id()'>Close</button>
</div>
</div>
<br>";
//return $html;
}
return $html;
}
else{
return "";
}
}
这是我的帖子代码
public function loadPostsFriends($data, $limit) {
$page = $data['page'];
$userLoggedIn = $this->user_obj->getUsername();
if($page == 1)
$start = 0;
else
$start = ($page - 1) * $limit;
$str = ""; //String to return
$data_query = mysqli_query($this->con, "SELECT * FROM posts WHERE deleted='no' ORDER BY id DESC");
if(mysqli_num_rows($data_query) > 0) {
$num_iterations = 0; //Number of results checked (not necasserily posted)
$count = 1;
while($row = mysqli_fetch_array($data_query)) {
$id = $row['id'];
$body = $row['body'];
$added_by = $row['added_by'];
$date_time = $row['date_added'];
$imagePath = $row['image'];
//Prepare user_to string so it can be included even if not posted to a user
if($row['user_to'] == "none") {
$user_to = "";
}
else {
$user_to_obj = new User($this->con, $row['user_to']);
$user_to_name = $user_to_obj->getFirstAndLastName();
$user_to = "to <a href='" . $row['user_to'] ."'>" . $user_to_name . "</a>";
}
//Check if user who posted, has their account closed
$added_by_obj = new User($this->con, $added_by);
if($added_by_obj->isClosed()) {
continue;
}
$user_logged_obj = new User($this->con, $userLoggedIn);
if($user_logged_obj->isFriend($added_by)){
if($num_iterations++ < $start)
continue;
//Once 10 posts have been loaded, break
if($count > $limit) {
break;
}
else {
$count++;
}
if($userLoggedIn == $added_by){
$delete_button = "<button class='delete_button' id='post$id' data-toggle='modal' data-target='#delete_form$id'>Delete Post</button>";
$edit_button = "<button class='edit_button' id='post$id' data-toggle='modal' data-target='#edit_form$id'>Edit Post</button>";
$repost_button = "";
}
else{
$delete_button = "";
$edit_button = "";
$repost_button = "<button class='edit_button' id='post$id' data-toggle='modal' data-target='#repost_form$id'><img src='assets/images/icons/repost.png' class='repostButton'>Repost</button>";
}
$user_details_query = mysqli_query($this->con, "SELECT first_name, last_name, profile_pic FROM users WHERE username='$added_by'");
$user_row = mysqli_fetch_array($user_details_query);
$first_name = $user_row['first_name'];
$last_name = $user_row['last_name'];
$profile_pic = $user_row['profile_pic'];
?>
<script>
function openModal<?php echo $id?>(){
document.getElementById('myModal<?php echo $id ?>').style.display = "block";
}
function closeModal<?php echo $id?>(){
document.getElementById('myModal<?php echo $id ?>').style.display = "none";
}
function toggle<?php echo $id; ?>(){
var target = $(event.target);
if(!target.is("a") && !target.is("button") && !target.is("img") && !target.is("textarea") && !target.is("")){
var element = document.getElementById("toggleComment<?php echo $id; ?>");
if(element.style.display == "block"){
element.style.display = "none";
}
else{
element.style.display = "block";
}
}
}
</script>
<?php
$comments_check = mysqli_query($this->con, "SELECT * FROM comments WHERE post_id='$id'");
$comments_check_num = mysqli_num_rows($comments_check);
//Timeframe
$date_time_now = date("Y-m-d H:i:s");
$start_date = new DateTime($date_time); //Time of post
$end_date = new DateTime($date_time_now); //Current time
$interval = $start_date->diff($end_date); //Difference between dates
if($interval->y >= 1) {
if($interval == 1)
$time_message = $interval->y . " year ago"; //1 year ago
else
$time_message = $interval->y . " years ago"; //1+ year ago
}
else if ($interval-> m >= 1) {
if($interval->d == 0) {
$days = " ago";
}
else if($interval->d == 1) {
$days = $interval->d . " day ago";
}
else {
$days = $interval->d . " days ago";
}
if($interval->m == 1) {
$time_message = $interval->m . " month". $days;
}
else {
$time_message = $interval->m . " months". $days;
}
}
else if($interval->d >= 1) {
if($interval->d == 1) {
$time_message = "Yesterday";
}
else {
$time_message = $interval->d . " days ago";
}
}
else if($interval->h >= 1) {
if($interval->h == 1) {
$time_message = $interval->h . " hour ago";
}
else {
$time_message = $interval->h . " hours ago";
}
}
else if($interval->i >= 1) {
if($interval->i == 1) {
$time_message = $interval->i . " minute ago";
}
else {
$time_message = $interval->i . " minutes ago";
}
}
else {
if($interval->s < 30) {
$time_message = "Just now";
}
else {
$time_message = $interval->s . " seconds ago";
}
}
if($imagePath != "") {
$imageDiv = "<div class='postedImage'>
<img src='$imagePath' onclick='openModal$id()'>
</div>";
}
else {
$imageDiv = "";
}
if($this->getRepostsPosts($id, $first_name, $last_name, $body, $imageDiv, $added_by, $imagePath) != ""){
$str .= $this->getRepostsPosts($id, $first_name, $last_name, $body, $imageDiv, $added_by, $imagePath);
}
$str .= "<div class='status_post' onClick='javascript:toggle$id()'>
<div class='post_profile_pic'>
<img src='$profile_pic' width='50'>
</div>
<div class='posted_by' style='color:#ACACAC;'>
<a href='$added_by'> $first_name $last_name </a> $user_to $time_message
</div>
<div id='post_body'>
$body
<br>
$imageDiv
<br>
<br>
</div>
<div class='modal fade' id='edit_form$id' tabindex='-1' role='dialog' aria-labelledby='postModalLabel' aria-hidden='true'>
<div class='modal-dialog' role='document'>
<div class='modal-content'>
<div class='modal-header'>
<h5 class='modal-title' id='exampleModalLabel'>Edit Your Post</h5>
<button type='button' class='close' data-dismiss='modal' aria-label='Close'>
<span aria-hidden='true'>×</span>
</button>
</div>
<div class='modal-body'>
<p>Edit your Post</p>
<form class='post_form' action='index.php' method='POST'>
<div class='form-group'>
<textarea class='form-control' id='post_text' name='post_text' placeholder='Got something to edit?'>$body</textarea>
<input type='hidden' name='post_id' value='$id'>
<button type='submit' class='btn btn-primary' name='edit' id='post_button'>Post</button>
</div>
</form>
</div>
<div class='modal-footer'>
<button type='button' class='btn btn-secondary' data-dismiss='modal'>Close</button>
</div>
</div>
</div>
</div>
<div class='modal fade' id='delete_form$id' tabindex='-1' role='dialog' aria-labelledby='postModalLabel' aria-hidden='true'>
<div class='modal-dialog' role='document'>
<div class='modal-content'>
<div class='modal-header'>
<h5 class='modal-title' id='exampleModalLabel'>Delete Your Post</h5>
<button type='button' class='close' data-dismiss='modal' aria-label='Close'>
<span aria-hidden='true'>×</span>
</button>
</div>
<div class='modal-body'>
<p>Are you sure you want to Delete?</p>
<form class='post_form' action='index.php' method='POST'>
<div class='form-group'>
<input type='hidden' name='post_id' value='$id'>
<button type='submit' class='btn btn-primary' name='delete' id='post_button'>Yes!</button>
</div>
</form>
</div>
<div class='modal-footer'>
<button type='button' class='btn btn-secondary' data-dismiss='modal'>No!</button>
</div>
</div>
</div>
</div>
<div class='modal fade' id='repost_form$id' tabindex='-1' role='dialog' aria-labelledby='postModalLabel' aria-hidden='true'>
<div class='modal-dialog' role='document'>
<div class='modal-content'>
<div class='modal-header'>
<h5 class='modal-title' id='exampleModalLabel'>Repost the Post</h5>
<button type='button' class='close' data-dismiss='modal' aria-label='Close'>
<span aria-hidden='true'>×</span>
</button>
</div>
<div class='modal-body'>
<p>Repost</p>
<p>\"$body\"</p>
<form class='post_form' action='index.php' method='POST'>
<div class='form-group'>
<textarea class='form-control' id='post_text' name='post_text' placeholder='Want something to say about the Repost?'></textarea>
<input type='hidden' name='post_id' value='$id'>
<input type='hidden' name='repost_by' value='$userLoggedIn'>
<button type='submit' class='btn btn-primary' name='repost' id='post_button'>Repost!</button>
</div>
</form>
</div>
<div class='modal-footer'>
<button type='button' class='btn btn-secondary' data-dismiss='modal'>Cancel</button>
</div>
</div>
</div>
</div>
<div class='newsFeedPostOptions'>
Comments($comments_check_num)
<iframe src='like.php?post_id=$id' id='likes_iframe' scrolling='no'></iframe>
$delete_button
$edit_button
$repost_button
</div>
</div>
<div class='post_comment' id='toggleComment$id' style='display:none;'>
<iframe src='comment_frame.php?post_id=$id' id='comment_iframe' frameborder='0'>
</iframe>
</div>
<div id='myModal$id' class='imageModal' style='display: none'>
<div class='modalContent'>
<img src='$imagePath' class='modalImage'>
<br>
<button class='button cursor' onclick='closeModal$id()'>Close</button>
</div>
</div>
<br>";
}
} //End while loop
if($count > $limit)
$str .= "<input type='hidden' class='nextPage' value='" . ($page + 1) . "'>
<input type='hidden' class='noMorePosts' value='false'>";
else
$str .= "<input type='hidden' class='noMorePosts' value='true'><center><p style='text-align: centre; padding-top: 30px; color: #ACACAC '> No more posts to show! </p></center>";
}
echo $str;
}
答案 0 :(得分：0)
首先，我应该警告您有关SQL注入的风险，并且您的代码可能会受到风险的影响，具体取决于您如何过滤$ post_id之类的内容，因为这可能会导致某人潜入drop table或类似的事情中毁了你的一天。
我强烈建议您查看准备好的语句来避免这种情况，但更建议您查看高度维护的库，这些库将SQL构建工作抽象为查询的更多程序化构建。例如Eloquent，它是一个出色的MVC框架Laravel的一部分，但可以独立使用，也可以作为其他框架的一部分。
要指出的另一件事是对数据库的查询过多，因为您有一个初始查询来获取转发/帖子，然后遍历结果并在每个帖子中查询用户，所以添加了太多查询到一个查询可以达到相同结果的函数。如果您是用代码手动编写SQL或切换到Eloquent，则可以使用联接，这是一种很好的方式来执行“热切加载”，即查询一个表并使用要求它包括用户或用户的关系。其他与结构相关的事物，例如外键。所有这些只花费您一个或两个查询，而不是多达n个，n是转发/发布的次数。
if($this->getRepostsPosts($id, $first_name, $last_name, $body, $imageDiv, $added_by, $imagePath) != ""){
$str .= $this->getRepostsPosts($id, $first_name, $last_name, $body, $imageDiv, $added_by, $imagePath);
}
存在两次执行相同多次查询的风险，第一种是仅检查是否存在重新发布，然后再次执行相同的功能请求。考虑将第一次调用的结果分配给变量，并检查条件，然后使用该变量（如果为true），请参见下文。
if (!empty($reposts = $this->getRepostsPosts($id, $first_name, $last_name, $body, $imageDiv, $added_by, $imagePath))) {
$str .= $reposts;
}
您甚至可以使用三元语言：
$str .= (
!empty($reposts = $this->getRepostsPosts($id, $first_name, $last_name, $body, $imageDiv, $added_by, $imagePath))
? $reposts
: ''
);
现在有很多东西要学习，但是确保您的SQL安全是一个很好的起点，随着您发现新技术，代码的效率将会提高。
对于您的问题，显示帖子的顺序可能会受到程序设计方法的困扰，您真正应该做的是将一系列帖子和帖子重新构建为属性对象，然后您已完成所有查询以填充数组，可以使用usort根据其item属性之一（可能是日期时间属性或您希望对其排序的其他值）对数组进行重新排序，然后对您进行排序可以使用foreach遍历该数组并一步构建HTML输出。
要为此提议的更改提供代码的变更版本需要大量的精力，因此，我认为您需要调整方法并更多地考虑分步执行代码，并尝试不开始准备演示文稿在您仍在获取数据时取而代之以数据，取而代之的是获取所有数据，组织和缩小数据，然后生成演示文稿。