500 - 内部服务器错误。您查找的资源存在问题，因而无法显示。
php文件夹
connect.php
?php
$server="localhost";//主机
$db_username="root";//你的数据库用户名
$db_password="root";//你的数据库密码
$con = mysql_connect($server,$db_username,$db_password);//链接数据库
if(!$con){
die("can't connect".mysql_error());//如果链接失败输出错误
}
mysql_select_db('test',$con);//选择数据库（test是数据库名称）
//字符转换，读库
login.php
<?PHP
header("Content-Type: text/html; charset=utf8");
if(!isset($_POST["submit"])){
exit("非法访问！");
}//检测是否有submit操作
include('connect.php');//链接数据库
$name = $_POST['name'];//post获得用户名表单值
$passowrd = MD5($_POST['password']);//post获得用户密码单值,使用MD5加密，不可逆
if ($name && $passowrd){//如果用户名和密码都不为空
$sql = "select * from admin where username = '$name' and password='$passowrd'";//检测数据库是否有对应的username和password的sql
$result = mysql_query($sql);//执行sql
$rows=mysql_num_rows($result);//返回一个数值
if($rows){//0 false 1 true
//登录成功
session_start();//启动Session
$_SESSION['name'] = $_POST['name'];
header("refresh:0;url=sucess.php");//如果成功跳转至sucess.php页面
exit;
}else{
echo "用户名或密码错误，请重新登录！";
echo "
<script>
setTimeout(function(){window.location.href='../login.html';},1000);
</script>
";//如果错误使用js 1秒后跳转到登录页面重试;
}
}else{//如果用户名或密码有空
echo "用户名或密码填写不完整，请重新登录！";
echo "
<script>
setTimeout(function(){window.location.href='../login.html';},1000);
</script>";
//如果错误使用js 1秒后跳转到登录页面重试;
}
mysql_close();//关闭数据库
?>
<?php
header("Content-Type: text/html; charset=utf8");
if(!isset($_POST['submit'])){
exit("错误执行");
}//判断是否有submit操作
$name=$_POST['name'];//post获取表单里的name
$password=MD5($_POST['password']);//post获取表单里的password,使用MD5加密，不可逆
include('connect.php');//链接数据库
$sql = "select username from admin where username = '$name'";//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('温馨提示：用户存在！'); history.go(-1);</script>";
} else {
$q="insert into admin(id,username,password) values (null,'$name','$password')";//向数据库插入表单传来的值的sql
$reslut=mysql_query($q,$con);//执行sql
if (!$reslut){
die('Error: ' . mysql_error());//如果sql执行失败输出错误
}else{
echo "注册成功";//成功输出注册成功
echo "
<script>
setTimeout(function(){window.location.href='../login.html';},1000);
</script>";
//如果注册成功使用js 1秒后跳转到登录页面;
}
}
mysql_close($con);//关闭数据库
?>
result.php
<?php
header("Content-Type: text/html; charset=utf8");
if(!isset($_POST['submit'])){
exit("错误执行");
}//判断是否有submit操作
$name=$_POST['name'];//post获取表单里的name
$password=MD5($_POST['password']);//post获取表单里的password,使用MD5加密，不可逆
include('connect.php');//链接数据库
$sql = "select username from admin where username = '$name'";//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('温馨提示：用户存在！'); history.go(-1);</script>";
} else {
$q="insert into admin(id,username,password) values (null,'$name','$password')";//向数据库插入表单传来的值的sql
$reslut=mysql_query($q,$con);//执行sql
if (!$reslut){
die('Error: ' . mysql_error());//如果sql执行失败输出错误
}else{
echo "注册成功";//成功输出注册成功
echo "
<script>
setTimeout(function(){window.location.href='../login.html';},1000);
</script>";
//如果注册成功使用js 1秒后跳转到登录页面;
}
}
mysql_close($con);//关闭数据库
?>
test.php
<?php
?>
login.html
<!DOCTYPE html>
<html lang="cn">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title></title>
<link href="css/login.css" type="text/css" rel="stylesheet">
<script type="text/javascript" src="js/login.js"></script>
</head>
<body>
<div class="y">
</div>
<div class="login">
<div class="message"></div>
<div id="darkbannerwrap"></div>
<form name="login" action="php/login.php" method="post">
<input name="name" id="name" placeholder="请输入登录帐号" type="text" required="required" maxlength="16">
<hr class="hr15">
<input name="password" id="password" placeholder="请输入登录密码" type="password" required="required" maxlength="16">
<hr class="hr15">
<input value="登录" style="width:100%;" type="submit" name="submit">
<a href="result.html">注册</a>
<a href="#">忘记密码</a>
<hr class="hr20">
</form>
</div>
</body>
</html>
result.html
<!DOCTYPE html>
<html lang="cn">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title></title>
<link href="css/result.css" type="text/css" rel="stylesheet">
<script type="text/javascript" src="js/result.js"></script>
</head>
<body>
<div class="login">
<div class="message"></div>
<div id="darkbannerwrap"></div>
<form name="result" action="php/result.php" method="post">
<input name="name" id="name" placeholder="请输入帐号" type="text" required="required" maxlength="16">
<hr class="hr15">
<input name="password" id="password" placeholder="请输入密码" type="password" required="required" maxlength="16">
<hr class="hr15">
<input name="pwd" id="pwd" placeholder="请再次输入密码" type="password" required="required" maxlength="16">
<hr class="hr15">
<input value="注册" style="width:100%;" type="submit" name="submit">
<a href="login.html">返回登录</a>
<a href="#">忘记密码</a>
<hr class="hr20">
</form>
</body>
</html>
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运维要高效，装宝塔
