用PHP实现用户登录和注册的功能

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1、登陆界面 login.PHP

1. <form action="logincheck.php" method="post">

2. 用户名：<input type="text" name="username" />

3. <br />

4. 密码：<input type="password" name="password" />

5. <br />

6. <input type="submit" name="submit" value="登陆" />

8. <a href="register.php">注册</a>

9. </form>

2、登录处理界面 logincheck.php

1. <?php

2. if(isset($_POST["submit"]) && $_POST["submit"] == "登陆")

3. {

4. $user = $_POST["username"];

5. $psw = $_POST["password"];

6. if($user == "" || $psw == "")

7. {

8. echo "<script>alert('请输入用户名或密码！'); history.go(-1);</script>";

9. }

10. else

11. {

12. mysql_connect("localhost","root","sixx");

13. mysql_select_db("vt");

14. mysql_query("set names 'gbk'");

15. $sql = "select username,password from user where username = '$_POST[username]' and password = '$_POST[password]'";

16. $result = mysql_query($sql);

17. $num = mysql_num_rows($result);

18. if($num)

19. {

20. $row = mysql_fetch_array($result); //将数据以索引方式储存在数组中

21. echo $row[0];

22. }

23. else

24. {

25. echo "<script>alert('用户名或密码不正确！');history.go(-1);</script>";

26. }

27. }

28. }

29. else

30. {

31. echo "<script>alert('提交未成功！'); history.go(-1);</script>";

32. }

33.

34. ?>

3、注册界面 register.php

1. <form action="regcheck.php" method="post">

2. 用户名：<input type="text" name="username"/>

3. <br/>

4. 密　码:<input type="password" name="password"/>

5. <br/>

6. 确认密码：<input type="password" name="confirm"/>

7. <br/>

8. <input type="Submit" name="Submit" value="注册"/>

9. </form>

4、注册处理界面 regcheck.php

1. <?php

2. if(isset($_POST["Submit"]) && $_POST["Submit"] == "注册")

3. {

4. $user = $_POST["username"];

5. $psw = $_POST["password"];

6. $psw_confirm = $_POST["confirm"];

7. if($user == "" || $psw == "" || $psw_confirm == "")

8. {

9. echo "<script>alert('请确认信息完整性！'); history.go(-1);</script>";

10. }

11. else

12. {

13. if($psw == $psw_confirm)

14. {

15. mysql_connect("localhost","root","sixx"); //连接数据库

16. mysql_select_db("vt"); //选择数据库

17. mysql_query("set names 'gdk'"); //设定字符集

18. $sql = "select username from user where username = '$_POST[username]'"; //SQL语句

19. $result = mysql_query($sql); //执行SQL语句

20. $num = mysql_num_rows($result); //统计执行结果影响的行数

21. if($num) //如果已经存在该用户

22. {

23. echo "<script>alert('用户名已存在'); history.go(-1);</script>";

24. }

25. else //不存在当前注册用户名称

26. {

27. $sql_insert = "insert into user (username,password,phone,address) values('$_POST[username]','$_POST[password]','','')";

28. $res_insert = mysql_query($sql_insert);

29. //$num_insert = mysql_num_rows($res_insert);

30. if($res_insert)

31. {

32. echo "<script>alert('注册成功！'); history.go(-1);</script>";

33. }

34. else

35. {

36. echo "<script>alert('系统繁忙，请稍候！'); history.go(-1);</script>";

37. }

38. }

39. }

40. else

41. {

42. echo "<script>alert('密码不一致！'); history.go(-1);</script>";

43. }

44. }

45. }

46. else

47. {

48. echo "<script>alert('提交未成功！'); history.go(-1);</script>";

49. }

50. ?>

使用PHP实现用户登录和注册功能——MySQL数据库文件

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