如何用PHP实现简单注册登录系统（附源码）

上篇文章给大家介绍了《如何用PHP解决高并发问题？（附源码）》，本文继续给大家介绍如何用PHP实现简单注册登录系统 ，一起研究吧！！！

目录结构如下，其中function文件夹下包含两个函数文件，uploads文件夹用于存放上传的文件。

注：博主使用的是php5，使用php7的小伙伴运行报错的话有一部分原因是新的语法造成的，修改成新语法就可以了

html页面

登录页面

index.html

<form action="login_process.php" method="POST">
    登录
    <input type="text" name="userName" size="20" maxlength="15" placeholder="请填写用户名及域名">
    <br>

    注册
    <input type="password" name="password" size="20" maxlength="15">
    <br>
    <input type="submit" value="登录">
    <input type="button" onclick="window.location.href='register.html'" value="注册">
</form>

注册页面

register.html

<h2>用户注册登录系统</h2>
<hr>
<form action="register.php" method="POST" enctype="multipart/form-data">
    用户名：
    <input type="text" name="userName" size="20" maxlength="15" placeholder="必须填写用户名">
    @
    <select name="domain" id="">
   <option value="@163测试数据" selected>163测试数据</option>
   <option value="@126测试数据">126测试数据</option>
    </select>
    <br>

    登录密码：
    <input type="password" name="password" size="20" maxlength="15">
    <br>
    
    确认密码：
    <input type="password" name="confirmPassword" size="20" maxlength="15">
    <br>

    选择性别：
    <input type="radio" name="sex" value="male" checked>男
    <input type="radio" name="sex" value="female">女
    <br>

    个人爱好：
    <input name="interests[]" type="checkbox" value="music">音乐
    <input name="interests[]" type="checkbox" value="game">游戏
    <input name="interests[]" type="checkbox" value="film">电影
    <br>

    个人相片
    <input type="hidden" name="MAX_FILE_SIZE" value="1024">
    <input type="file" name="myPicture" size="25" maxlength="100">
    <br>

    备注信息：
    <textarea name="remark" cols="30" rows="4" placeholder="请填写备注信息"></textarea>
    <br>

    <input type="submit" name="submit" value="注册">
    <input type="reset" name="cancel" value="重填">
</form>

功能实现文件

实现登录功能

login_process.php

<?php
    include_once("function/database.php");
    // $userName = $_POST['userName'];
    // $password = $_POST['password'];
    $userName = addslashes($_POST['userName']);
    $password = addslashes($_POST['password']);
    getConnect();
    $loginSQL = "select * from users where userName='$userName' and password='$password'";
    echo $loginSQL;
    $resultLogin = mysql_query($loginSQL);
    if (mysql_num_rows($resultLogin) > 0) {
   echo "登录成功";
    } else {
   echo "登录失败";
    }
    closeConnect();
?>

实现注册功能

register.php

<?php
    include_once("function/fileSystem.php");
    include_once("function/database.php");

    if (empty($_POST)) {
   exit("您提交的表单数据超过post_max_size! <br>");
    }

    // 判断输入密码与确认密码是否相同
    $password = $_POST['password'];
    $confirmPassword = $_POST['confirmPassword'];
    if ($password != $confirmPassword) {
   exit("输入的密码与确认密码不相等！");
    }

    $userName = $_POST['userName'];
    $domain = $_POST['domain'];
    $userName = $userName . $domain;

    // 判断用户名是否重复
    $userNameSQL = "select * from users where userName = '$userName'";
    getConnect();
    $resultSet = mysql_query($userNameSQL);
    if (mysql_num_rows($resultSet) > 0) {
   exit("用户名已被占用，请更换其他用户名");
    }

    $sex = $_POST['sex'];
    if (empty($_POST['interests'])) {
   $interests = "";
    } else {
   $interests = implode(";", $_POST['interests']);
    }

    $remark = $_POST['remark'];
    $myPictureName = $_FILES['myPicture']['name'];

    $registerSQL = "insert into users values(null, '$userName', '$password', '$sex', '$interests', '$myPictureName', '$remark')";
    $message = upload($_FILES['myPicture'], "uploads");

    if ($message == "上传成功" || $message == "没有上传") {
   mysql_query($registerSQL);
   $userID = mysql_insert_id();
   echo "注册成功<br>";
    } else {
   exit($message);
    }

    $userSQL = "select * from users where user_id = '$userID'";
    $userResult = mysql_query($userSQL);
    if ($user = mysql_fetch_array($userResult)) {
   echo "您的注册用户名为：" . $user['userName'];
    } else {
   exit("用户注册失败！");
    }
    closeConnect();

函数文件（function文件夹）

实现数据库连接与关闭的函数

database.php

<?php
    $databaseConnection = null;
    function getConnect() {
   $hosthome = "localhost";
   $database = "register";
   $userName = "root";
   $password = "123456";
   global $databaseConnection;
   $databaseConnection = @mysql_connect($hosthome, $userName, $password) or die (mysql_error());
   mysql_query("set names gbk");
   @mysql_select_db($database, $databaseConnection) or die (mysql_error());
    }
    
    function closeConnect() {
   global $databaseConnection;
   if ($databaseConnection) {
  @mysql_close($databaseConnection) or die (mysql_error());
   }
    }
?>

实现文件上传的函数

fileSystem.php

<?php
    function upload($file, $filePath) {
   $error = $file['error'];
   switch ($error) {
  case 0:
 $fileName = $file['name'];
 $fileTemp = $file['tmp_name'];
 $destination = $filePath . "/" . $fileName;
 move_uploaded_file($fileTemp, $destination);
 return "上传成功";
  case 1:
 return "上传超过upload_max_filesize";
  case 2:
 return "上传文件超过form的MAX_FILE_SIZE";
  case 3:
 return "附件部分上传";
  case 4:
 return "没有上传";
   }
    }
    ?>

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