PHP跳转页面，PHP写评论区和文件上传框

一.PHP跳转页面

1.cookie和session的区别
Cookie数据存储在本地，session在服务器下发cookie
2.首先，创建并编写index.php , link.php, zhuye.php三个文件并用vscode打开。先编写index.php文件，用from表单写一个简单的登录页面。代码如下：

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<!DOCTYPE html>
<?php header('Content-Type: text/html; charset=utf-8');?>

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>汗流浃背了</title>
</head>
<body>
    <form method="post" action="link.php">
    <tr>
        <td>用户名</td>
        <td><input type="text" name="username" ></td></tr><br>
    <tr>
        <td>密码&nbsp&nbsp&nbsp</td>
        <td><input type="password" name="password" ></td></tr><br>
    <tr>
        <td><input type="checkbox"name="remeber" value="yes" >记住密码</td><br>
        <td><input type="submit" name="submit"  value="提交" ></td>
        <td><input type="reset"   value="重置" ></td>
    </tr>
    
</body>
</html>

3.再编写link.php，用于连接数据库。用session存储index.php传递过来的用户名和密码
然后在数据库中查询是否存在该用户名和密码。

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<?php
header('content-type: text/html; charset=utf-8');
session_start();

if(isset($_POST['submit'])){
    $u = trim($_POST['username']);
    $p = trim($_POST['password']);
 $link=mysqli_connect("127.0.0.1","root","root","security")or exit("Error connecting");
      mysqli_query($link,"set names utf8");
  $sql=  "select * from users where username='$u' and password='$p'";
  $result=mysqli_query($link, $sql) ;
  if(mysqli_num_rows($result)>=1){
        $_SESSION['user']=$u;       
        setcookie('password',$p,time()+7*12*60*60);
        header('Location:zhuye.php');
        exit();
    }else{
        echo "<br>";
        echo '用户名或密码错误!请重新输入!';
		//sleep(3);
		echo '<h1><a href="./index.php">返回</a></h1>';
        }
}

?>

4.编写 zhuye.php,传递数据库对应的用户名并显示。然后实现用户注销的功能。

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<?php
session_start();

header('Content-Type: text/html; charset=utf-8');

if(isset($_SESSION['user'])){
	echo '当前登录用户:'.$_SESSION['user'].''; 
	


if (isset($_GET['logout'])) {
    // 清除会话数据
    session_unset();
    session_destroy();
    echo "您已成功注销。<br>";
	header('Location:index.php');
}


echo '<h1><a href="?logout=true">注销</a></h1>';


}else{
echo '错误!';
header('Location:index.php');
}
?>

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二.PHP写评论区和文件上传框

1.创建并编写comment.php,先用from表单的textarea写一个评论区。右击虚拟机的navicat.exe的之前创的数据库security，新建数据表security,把用户输入的评论插入到security数据库的数据表comments。
image.png

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .ab {
            color:blue;

        }
    </style>
</head>

<body>
    <form method="post" action="">
        <label for="comment">发表评论</label>

        <textarea name="comment" id="comment" rows="10" cols="80"></textarea>

        <input type="submit" name="submit" value="提交评论">
    </form>
    <h1 class="ab">历史评论</h1>
    <?php
    if ($_SERVER['REQUEST_METHOD'] == 'POST') {
        if (isset($_POST['comment']) && !empty($_POST['comment'])) {
            $comment = $_POST['comment'];
            $link = mysqli_connect("localhost", "root", "root", "security") or exit("数据库连接失败！");
            mysqli_query($link, "set names utf8");
            $ChaRu = "insert INTO comments (comment) VALUES('$comment')";
            if (mysqli_query($link, $ChaRu)) {
                echo "<p>你的评论已成功保存到数据库。</p>";
            } else {
                echo "<p style='color: red;'>保存评论时出错。</p>";
            }
            mysqli_close($link);
        }
    }
    // 显示最近的20条评论
    $link = mysqli_connect("localhost", "root", "root", "security") or exit("数据库连接失败！");
    mysqli_query($link, "set names utf8");

    $query = "SELECT * FROM comments ORDER BY id DESC LIMIT 20";    
    $result = mysqli_query($link, $query);

    if ($result) {
        echo "<h2>最近的评论</h2>";
        while ($row = mysqli_fetch_assoc($result)) {
            echo "<p>{$row['comment']}</p>";
        }
    } else {
        echo "<p style='color: red;'>获取评论时出错。</p>";
    }

    mysqli_close($link);
    ?>
</body>

</html>

2.创建并编写upload.php,再创建upload文件夹，存储用户上传的文件，把index.php， link.php, zhuye.php，comment.php，upload文件夹复制到phpstudy的根目录下，启动apache和mysql，打开网站，登录，输入评论，上传头像。

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<?php
echo '
<form action="" method="post" enctype="multipart/form-data">
<label for="upload">上传你的头像</label>
<input name="file" id="upload" type="file" >
<label for="submit"  >文件上传</label>
<input name="submit" id="submit" type="submit">
<h1>下面是接收到的文件</h1>
</form>
';
header('Content-Type: text/html; charset=utf-8');
if(isset($_FILES["file"])){
    $upload_dir = "uploads";
    $file_name = $_FILES["file"]["name"];
    $file_type = $_FILES["file"]["type"];
    $file_size = $_FILES["file"]["size"];
    $file_tmp = $_FILES["file"]["tmp_name"];
    $target_path = $upload_dir.'/'.$file_name;
    if (move_uploaded_file($file_tmp, $target_path)){
        echo "上传成功"."<br>";
        echo "文件类型: " . $file_type . "<br>";
        echo "文件大小: " . ($file_size / 1024) . " kB<br>";
        echo "文件存储的位置: " . $target_path;
    }else{
        echo "上传失败"."<br>";
    }
	echo "<br/>";
echo "<img src='./$target_path.'>";
}







?>

image.png

Title:PHP跳转页面，PHP写评论区和文件上传框

Author:

Created:2023-12-14, 14:17:43

Updated:2023-12-14, 14:21:49

Full URL:http://example.com/2023/12/14/PHP%E8%B7%B3%E8%BD%AC%E9%A1%B5%E9%9D%A2%EF%BC%8CPHP%E5%86%99%E8%AF%84%E8%AE%BA%E5%8C%BA%E5%92%8C%E6%96%87%E4%BB%B6%E4%B8%8A%E4%BC%A0%E6%A1%86/

License: "CC BY-NC-SA 4.0" Keep Link & Author if Distribute.

Contents
  1. 1. 一.PHP跳转页面
  2. 2. 二.PHP写评论区和文件上传框
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