使用PHP實現用戶登入和註冊的功能，相信很多同學都可以寫的出來用PHP實現登入註冊的功能了，給一些剛入門的PHP程式設計師，給你們指路了。
登陸介面login.php
<form action="logincheck.php" method="post">
用户名：<input type="text" name="username" />
<br />
密码：<input type="password" name="password" />
<br />
<input type="submit" name="submit" value="登陆" />
<a href="register.php">注册</a>
</form>登入處理介面logincheck.php
<?php
if(isset($_POST["submit"]) && $_POST["submit"] == "登陆")
{
$user = $_POST["username"];
$psw = $_POST["password"];
if($user == "" || $psw == "")
{
echo "<script>alert('请输入用户名或密码！'); history.go(-1);</script>";
}
else
{
mysql_connect("localhost","root","sixx");
mysql_select_db("vt");
mysql_query("set names 'gbk'");
$sql = "select username,password from user where username = '$_POST[username]' and password = '$_POST[password]'";
$result = mysql_query($sql);
$num = mysql_num_rows($result);
if($num)
{
$row = mysql_fetch_array($result); //将数据以索引方式储存在数组中
echo $row[0];
}
else
{
echo "<script>alert('用户名或密码不正确！');history.go(-1);</script>";
}
}
}
else
{
echo "<script>alert('提交未成功！'); history.go(-1);</script>";
}
?>註冊介面register. php
<form action="regcheck.php" method="post">
用户名：<input type="text" name="username"/>
<br/>
密 码:<input type="password" name="password"/>
<br/>
确认密码：<input type="password" name="confirm"/>
<br/>
<input type="Submit" name="Submit" value="注册"/>
</form>註冊處理介面regcheck.php
<?php
if(isset($_POST["Submit"]) && $_POST["Submit"] == "注册")
{
$user = $_POST["username"];
$psw = $_POST["password"];
$psw_confirm = $_POST["confirm"];
if($user == "" || $psw == "" || $psw_confirm == "")
{
echo "<script>alert('请确认信息完整性！'); history.go(-1);</script>";
}
else
{
if($psw == $psw_confirm)
{
mysql_connect("localhost","root","sixx"); //连接数据库
mysql_select_db("vt"); //选择数据库
mysql_query("set names 'gdk'"); //设定字符集
$sql = "select username from user where username = '$_POST[username]'"; //SQL语句
$result = mysql_query($sql); //执行SQL语句
$num = mysql_num_rows($result); //统计执行结果影响的行数
if($num) //如果已经存在该用户
{
echo "<script>alert('用户名已存在'); history.go(-1);</script>";
}
else //不存在当前注册用户名称
{
$sql_insert = "insert into user (username,password,phone,address) values('$_POST[username]','$_POST[password]','','')";
$res_insert = mysql_query($sql_insert);
//$num_insert = mysql_num_rows($res_insert);
if($res_insert)
{
echo "<script>alert('注册成功！'); history.go(-1);</script>";
}
else
{
echo "<script>alert('系统繁忙，请稍候！'); history.go(-1);</script>";
}
}
}
else
{
echo "<script>alert('密码不一致！'); history.go(-1);</script>";
}
}
}
else
{
echo "<script>alert('提交未成功！'); history.go(-1);</script>";
}
?>以上就是使用PHP註冊和登入的功能，送給剛入門的PHP程式設計師，更多關於PHP的好文章和視頻教程盡在PHP中文網哦！祝你們早日成為大牛！
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