PHP实现的用户注册表单验证功能简单示例

本文实例讲述了PHP实现的用户注册表单验证功能。分享给大家供大家参考，具体如下：

注册界面

  <h1>用户注册</h1>
  <form method="post" action="register_verify.php">
    <input type="text" placeholder="用户名" name="username"><br><br>
    <input type="password" placeholder="密码" name="password"><br><br>
    <input type="password" placeholder="重复密码" name="password2"><br><br>
    <label>性别：
      <input type="radio" name="sex" value="男" checked="checked">男
      <input type="radio" name="sex" value="女">女</label><br><br>
    <input type="email" placeholder="邮箱" name="email"><br><br>
    <button class="btn" type="submit">注册</button>
  </form>

register_verify.php

<?php
require "mysql.php";      //导入mysql.php访问数据库
$username=$_POST['username'];
$password=$_POST['password'];
$password2=$_POST['password2'];
$sex=$_POST['sex'];
$email=$_POST['email'];
if(checkEmpty($username,$password,$password2,$sex,$email)){
  if(checkpwd($password,$password2)){
    if(checkEmail($email)){
      if(insert($username,$password,$sex,$email))
        echo"注册成功";
    }
  }
}
//方法：判断是否为空
function checkEmpty($username,$password,$password2,$sex,$email){
  if($username==null||$password==null||$password2==null){
    echo '<html><head><Script Language="JavaScript">alert("用户名或密码为空");</Script></head></html>'       . "<meta http-equiv=\"refresh\" content=\"0;url=register.html\">";
  }
  else{
    if($sex==null){
      echo '<html><head><Script Language="JavaScript">alert("性别为空");</Script></head></html>' .          "<meta http-equiv=\"refresh\" content=\"0;url=register.html\">";
    }
    elseif($email==null){
      echo '<html><head><Script Language="JavaScript">alert("邮箱为空");</Script></head></html>' .          "<meta http-equiv=\"refresh\" content=\"0;url=register.html\">";
    }
    else{
      return true;
    }
  }
}
//方法：检查两次密码是否相同
function checkpwd($password,$password2){
  if($password==$password2)
    return true;
  else
    echo '<html><head><Script Language="JavaScript">alert("两次密码不一致");</Script></head></html>' .        "<meta http-equiv=\"refresh\" content=\"0;url=register.html\">";
}
//方法：邮箱格式验证
function checkEmail($email){
  $preg = '/^(\w{1,25})@(\w{1,16})(\.(\w{1,4})){1,3}$/';
  if(preg_match($preg, $email)){
    return true;
  }else{
    echo '<html><head><Script Language="JavaScript">alert("邮箱格式有误");</Script></head></html>' .        "<meta http-equiv=\"refresh\" content=\"0;url=register.html\">";
  }
}
//方法：将数据插入数据库中
function insert($username,$password,$sex,$email){
  $conn=new Mysql();
  $sql="insert into user VALUE (null,'$username','$password','$sex','$email')";
  $result=$conn->sql($sql);
  if($result){
    return true;
  }
  else{
    echo '<html><head><Script Language="JavaScript">alert("写入数据库失败");</Script></head></html>' .        "<meta http-equiv=\"refresh\" content=\"0;url=register.html\">";
  }
  $conn->close();
}

验证码和数据库的实现方法前面写过，这里不再赘述。

希望本文所述对大家PHP程序设计有所帮助。

PHP实现的用户注册表单验证功能简单示例

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