php之字符串实战注册页面

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代码块
前端

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>注册</title>
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body{
      background: dodgerblue;
    }
    #form{
      border-radius: 12px;
      width: 20em;
      height: 20em;
      margin: 1em auto;
      position: relative;
      top: 10em;
      background: #888888;
    }
    form {
     padding-left: 2em;
      padding-top: 7em;
    }
    #title{
      position: absolute;
      padding-left: 6em;
      padding-top: 2em;
      font-size: 20px;
    }
  #submit input{
    width: 5em;
    height: 2em;
  }
  #submit {
    padding-top: 1em;
    padding-left: 6em;
  }
  </style>
</head>
<body>
<div id="form">
  <div id="title">用户注册</div>
  <form action="demo.php" style="display: grid;gap: 0.5em" method="post">
    <div>
        <label>昵&emsp;&emsp;称*<input type="text" name="username" autofocus placeholder="用户名为2-16位"></label>
    </div>
    <div>
        <label>邮&emsp;&emsp;箱*<input type="email" name="email" placeholder="demo@email.com"></label>
    </div>
    <div>
        <label>密&emsp;&emsp;码*<input type="password" name="pwd" placeholder="密码为6-16位"></label>
    </div>
       <div>
        <label>确认密码*<input type="password" name="pwd_two" placeholder="密码为6-16位"></label>
    </div>
    <div>
<!--      secret绑定input的id-->
      <label for="secret">性别：</label>
     <label><input type="radio" name="sex"  id="man" value="man">男</label>
      <label><input type="radio" name="sex" id="woman" value="woman">女</label>
     <label><input type="radio" name="sex"  id="secret" value="secret" checked>保密</label>
    </div>
      <div id="submit">
      <input type="submit" value="注册" >
    </div>
  </form>
</div>
</body>
</html>

后端

<?php
$data = $_POST;
if (empty($data)) {
    header("refresh:1;url=http://www.test.com");
    exit("数据不能为空....");
}
$arr = ['username' => '用户名','email'=>'邮箱','pwd' => '密码'];
foreach ($arr as $k => $v) {
    if (empty($data[$k])) {
        header("refresh:1;url=http://www.test.com");
        exit($v."不能为空");
    }
}
if ($data['pwd'] != $data['pwd_two']) {
    header("refresh:1;url=http://www.test.com");
    exit("密码不一致");
}
if(!preg_match('/^[A-Za-z0-9_\x{4e00}-\x{9fa5}]+$/u',$data['username'])) {
    header("refresh:1;url=http://www.test.com");
    exit("用户名由2-16位数字或字母、汉字、下划线组成！");
}
if(!preg_match('/(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z]).{8,16}/', $data['pwd'])) {
    header("refresh:1;url=http://www.test.com");
    exit("密码由6-16位字符（英文/数字/符号）三种组合！");
}
header("refresh:1;url=http://www.test.com");
exit("注册成功");

页面展示

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