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shouye(denglu).php
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<!DOCTYPE html>
<html lang="ch">
<head>
<meta charset="UTF-8">
<title>首页</title>
<link rel="stylesheet" type="text/css" href="首页（登录）.css">
<link rel="stylesheet" type="text/css" href="public.css"><!--外部样式-->
<script type="text/javascript" src="动画.js"></script>
</head>
<body>
<h1>课业难题交流</h1>
<div id="first" onclick=window.open("个人中心.html") onmouseover="over(this)" onmouseout="out(this)"></div>
<div id="textOne">
<p>个人中心</p>
</div>
<div id="second" onclick=window.open("提问.html") onmouseover="over(this)" onmouseout="out(this)"></div>
<div id="textTwo">
<p>我要提问</p>
</div>
<center>
<form action="sousuo.php" method="post">
<br>
<input type="text" placeholder="在这里搜索课程或问题" name="course" class="search">
<select name="select_type" class="selection">
<option value="0" >课程</option>
<option value="1" >问题</option>
</select>
<br><br>
<select name="shaixuan" class="selection"><!--筛选-->
<option value="0">按提问时间升序</option>
<option value="1">按提问时间降序</option>
<option value="2">按回复数升序</option>
<option value="3">按回复数降序</option>
<option value="4">已解决</option>
<option value="5">未解决</option>
<option value="6">按点赞数升序</option>
<option value="7">按点赞数降序</option>
</select>
<br><br>
<input type="submit" value="搜索" class="upLoad">
</form>
</center><!--提供搜索功能，可以搜索课程，也可以直接搜索问题。可以选择搜索的排序。搜索课程时，会显示出该课程中相应的问题。-->
<br>
<p>热点讨论区：</p>
<img src="picture_dissicion.jpg">
<table><!--显示出需求度最高的5个问题-->
<tr>
<th width="400px" style="float: left;" >内容：</th>
<th width="100px">提问人：</th>
<th width="100px">回复数目：</th>
<th width="100px">是否解决：</th>
<th width="100px">提问时间：</th>
<th width="100px">需求人数：</th>
</tr>
<?php
$con=mysqli_connect("localhost","root","","users");
if (!$con){
die("连接失败:".mysqli_connect_error());
}
$result = mysqli_query($con,"SELECT * FROM problem ORDER BY reply_num DESC");
$num=mysqli_num_rows($result);
if ($num>4)
{
$number=4;
}
else
{
$number=$num;
}
for ($x=1;$x<=$number;$x++)
{
$row=mysqli_fetch_array($result);
echo "<tr>"."<td>";
$text=$row["text_content"];
echo "<a style='margin-left: 30px' target='_blank' href='answer_question.php?content=$text'>".$text."</a>"."</td>";
echo "<td>".$row['people']."</td>";
echo "<td>".$row['reply_num']."</td>";
echo "<td>".$row['state']."</td>";
echo "<td>".$row['time']."</td>";
echo "<td>".$row['praise_num']."</td>";
echo "</tr>";
}
mysqli_close($con);
?>
</table>
</body>
</html>