本文例項為大家分享了PHP實現簡單註冊登入系統的具體程式碼，供大家參考，具體內容如下

目錄結構如下，其中function資料夾下包含兩個函式檔案，uploads資料夾用於存放上傳的檔案。

注：博主使用的是php5，使用php7的小夥伴執行報錯的話有一部分原因是新的語法造成的，修改成新語法就可以了

html頁面

登入頁面

index.html

<form action="login_process.php" method="POST">
 登入
 <input type="text" name="userName" size="20" maxlength="15" placeholder="請填寫使用者名稱及域名">
 <br>

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

註冊頁面

register.html

<h2>使用者註冊登入系統</h2>
<hr>
<form action="register.php" method="POST" enctype="multipart/form-data">
 使用者名稱：
 <input type="text" name="userName" size="20" maxlength="15" placeholder="必須填寫使用者名稱">
 @
 <select name="domain" id="">
 <option value="@163.com" selected>163.com</option>
 <option value="@126.com">126.com</option>
 </select>
 <br>

 登入密碼：
 <input type="password" name="password" size="20" maxlength="15">
 <br>
 
 確認密碼：
 <input type="password" name="confirmPassword" size="20" maxlength="15">
 <br>

 選擇性別：
 <input type="radio" name="sex" value="male" checked>男
 <input type="radio" name="sex" value="female">女
 <br>

 個人愛好：
 <input name="interests[]" type="checkbox" value="music">音樂
 <input name="interests[]" type="checkbox" value="game">遊戲
 <input name="interests[]" type="checkbox" value="film">電影
 <br>

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

 備註資訊：
 <textarea name="remark" cols="30" rows="4" placeholder="請填寫備註資訊"></textarea>
 <br>

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

功能實現檔案

實現登入功能
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 "登入成功";
 } else {
 echo "登入失敗";
 }
 closeConnect();
?>

實現註冊功能

register.php

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

 if (empty($_POST)) {
 exit("您提交的表單資料超過post_max_size! <br>");
 }

 // 判斷輸入密碼與確認密碼是否相同
 $password = $_POST['password'];
 $confirmPassword = $_POST['confirmPassword'];
 if ($password != $confirmPassword) {
 exit("輸入的密碼與確認密碼不相等！");
 }

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

 // 判斷使用者名稱是否重複
 $userNameSQL = "select * from users where userName = '$userName'";
 getConnect();
 $resultSet = mysql_query($userNameSQL);
 if (mysql_num_rows($resultSet) > 0) {
 exit("使用者名稱已被佔用，請更換其他使用者名稱");
 }

 $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 == "上傳成功" || $message == "沒有上傳") {
 mysql_query($registerSQL);
 $userID = mysql_insert_id();
 echo "註冊成功<br>";
 } else {
 exit($message);
 }

 $userSQL = "select * from users where user_id = '$userID'";
 $userResult = mysql_query($userSQL);
 if ($user = mysql_fetch_array($userResult)) {
 echo "您的註冊使用者名稱為：" . $user['userName'];
 } else {
 exit("使用者註冊失敗！");
 }
 closeConnect();

函式檔案（function資料夾）

實現資料庫連線與關閉的函式

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());
 }
 }
?>

實現檔案上傳的函式

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 "上傳成功";
 case 1:
 return "上傳超過upload_max_filesize";
 case 2:
 return "上傳檔案超過form的MAX_FILE_SIZE";
 case 3:
 return "附件部分上傳";
 case 4:
 return "沒有上傳";
 }
 }
?>

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。