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php简单实现模拟用户登陆验证
超超多喝水
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为了保障用户账号密码安全，往往需要对用户的账号注册、密码等输入内容做一个检测限制，如弱口令限制，验证码防机器自动脚本限制等，下面对用户模拟注册做一个简单的限制：

实例

<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>用户注册页面</title>
    <style>
        #main {
            /*让div内部文字居中*/
            background-color: #fff;
            border-radius: 20px;
            width: 300px;
            height: 350px;
            margin: auto;
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
        }
    </style>
</head>

<body>
    <?php
    //显示除去 E_NOTICE 之外的所有错误信息
    error_reporting(E_ALL & ~E_NOTICE);
    //制作验证码
    //声明一个字符串集
    $codes = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';
    //做一个四位的验证码，
    for($i=0;$i<4;$i++){
        $code .= "<span style='color:rgb(".mt_rand(0,255).",".mt_rand(0,255).",".mt_rand(0,255).")'>".$codes{mt_rand(0,strlen($codes)-1)}."</span>";
    } 
    ?>
    <div id="main">
        <!-- 建立html输入页面 -->
        <form action="" method="post">
            请输入账号：<input type="text" name="username" value="<?=$username?>" required><br>
            请输入密码：<input type="password" name="password1" required value="<?=$password1?>"><br>
            请确认密码：<input type="password" name="password2" required value="<?=$password2?>"><br>
            请输入验证码：<?=$code?>
                        <input type="text" name="code1"><br>
                        <input type="text" name="code2" value = "<?=$code?>" hidden><br>
                        <input type="submit" name="sub" value="注册">
        </form>
    </div>
    <?php
        //获取POST提交的内容
        $username = $_POST["username"];
        $password1 = $_POST["password1"];
        $password2 = $_POST["password2"];
        $sub = $_POST["sub"];
        $code1 = $_POST['code1'];
        //将验证码的内容转为小写
        $code2 = strip_tags($_POST['code2']);
        //将用户名首位转为大写
        $username = ucfirst($username);
        //数字连续字符弱口令判断
        $weak = strpos($password1,'012')===false?strpos($password1,'123')===false?strpos($password1,'234')===false?strpos($password1,'345')===false?strpos($password1,'456')===false?strpos($password1,'678')===false?strpos($password1,'789')===false?strpos($password1,'890')===false?:'':'':'':'':'':'':'':'';
        //检测是否有点击操作
        if(isset($sub)):
            //strcasecmp($string1,$string2)不区分大小写做判断，判断验证码输入是否正确
            if(strcasecmp($code1,$code2)!=0) $mess = "<span style='color:red;'>验证码输入错误</span>";
        endif;
        //如果没有报错且有点击操作往下执行
        if(!$mess && isset($sub)):
            //判断用户名首位是否是字母
            if(ord($username)<65 || ord($username)>90):    echo "<span style='color:red;'>用户名必须以字母开头</span>";
            else:
                //判断是否是弱口令
                if($weak!==false):  echo "<span style='color:red;'>密码过于简单，请重新输入</span>";
                else:
                    //判断两次输入密码是否一致
                    if($password1 !== $password2):  echo "<span style='color:red;'>两次输入密码不一致</span>";
                    else:
                        //判断密码长度是否在6-12位
                        if(strlen($password1)<6 || strlen($password1)>12): echo "<span style='color:red;'>密码长度请设置6-12位字符</span>";
                        //如果都符合条件返回注册成功提示并将密码加密方便后面传输
                        else:$password3 = sha1($password1);$password4 = sha1($password2);echo "注册成功，请返回登录";
                        endif;
                    endif;
                endif;
            endif;
        //如果有报错直接输出报错
        else:echo $mess;
        endif;
    ?>
</body>

</html>

运行实例 »

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Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：
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