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How to implement database verification jump in php

藏色散人Original: 2021-07-01 09:05:371969browse

php method to implement database verification jump: first create the login.html file; then create the doLogin.php file; then perform a null operation, and then perform verification code verification after passing it; and finally perform database verification.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How does php achieve database verification jump?

Examples of PHP login verification function [user name, password, verification code, database, logged in verification, automatic login and logout, etc.]

The example in this article describes the PHP login verification function. Share it with everyone for your reference, the details are as follows:

How to implement database verification jump in php

##The specific implementation method is as follows:

<!DOCTYPE html 
<html 
<head 
  <meta charset="UTF-8" 
  <title Title</title 
</head 
<body 
<form method="post" action="doLogin.php" 
  <input type="text" placeholder="用户名" name="username" <br <br 
  <input type="password" placeholder="密码" name="password" <br <br 
  <input type="text" placeholder="验证码" name="verifycode" <br <br 
  <img id="captcha_img" src="captcha.php?r=<?php echo rand();? " alt="验证码" 
  <label <a href="javascript:void(0)" rel="external nofollow" onclick="document.getElementById(&#39;captcha_img&#39;).src=&#39;captcha.php?r=&#39;+Math.random()" 换一个</a  </label <br 
  <label <input type="checkbox" name="autologin[]" value="1"/ 自动登录</label <br 
  <button type="submit" 登录</button 
</form 
</body 
</html

doLogin.php

<?php
header("Content-type:text/html;charset=UTF-8");
require "mysql.php";      //导入mysql.php访问数据库
session_start();        //开启会话一获取到服务器端验证码
$username=$_POST[&#39;username&#39;];
$password=$_POST[&#39;password&#39;];
$autologin=isset($_POST[&#39;autologin&#39;])?1:0;   //获取是否选择了自动登录
$verifycode=$_POST[&#39;verifycode&#39;];
$code=$_SESSION[&#39;code&#39;];    //获取服务器生成的验证码
/*
* 首先进行判空操作，通过后进行验证码验证，通过后再进行数据库验证。
* 手机号码和邮箱验证可根据需要自行添加
* */
if(checkEmpty($username,$password,$verifycode)){
if(checkVerifycode($verifycode,$code)){
if(checkUser($username,$password)){
$_SESSION[&#39;username&#39;]=$username; //保存此时登录成功的用户名
if($autologin==1){        //如果用户勾选了自动登录就把用户名和加了密的密码放到cookie里面
setcookie("username",$username,time()+3600*24*3);  //有效期设置为3天
setcookie("password",md5($password),time()+3600*24*3);
}
else{
setcookie("username","",time()-1);  //如果没有选择自动登录就清空cookie
setcookie("password","",time()-1);
}
header("location: index.php ");      //全部验证都通过之后跳转到首页
}
}
}
//方法：判断是否为空
function checkEmpty($username,$password,$verifycode){
if($username==null||$password==null){
echo &#39;<html <head <Script Language="JavaScript" alert("用户名或密码为空");</Script </head </html &#39; . "<meta http-equiv=\"refresh\" content=\"0;url=login.html\" ";
}
else{
if($verifycode==null){
echo &#39;<html <head <Script Language="JavaScript" alert("验证码为空");</Script </head </html &#39; . "<meta http-equiv=\"refresh\" content=\"0;url=login.html\" ";
}
else{
return true;
}
}
}
//方法：检查验证码是否正确
function checkVerifycode($verifycode,$code){
if($verifycode==$code){
return true;
}
else{
echo &#39;<html <head <Script Language="JavaScript" alert("验证码错误");</Script </head </html &#39; . "<meta http-equiv=\"refresh\" content=\"0;url=login.html\" ";
}
}
//方法：查询用户是否在数据库中
function checkUser($username,$password){
$conn=new Mysql();
$sql="select * from user where name=&#39;{$username}&#39; and password=&#39;{$password}&#39;;";
$result=$conn- sql($sql);
if($result){
return true;
}
else{
echo &#39;<html <head <Script Language="JavaScript" alert("用户不存在");</Script </head </html &#39; . "<meta http-equiv=\"refresh\" content=\"0;url=login.html\" ";
}
$conn- close();
}
//方法：手机格式验证
function checkPhoneNum($phonenumber){
$preg="/^1[34578]{1}\d{9}$/";
if(preg_match($preg,$phonenumber)){
return ture; //验证通过
}else{
echo &#39;<html <head <Script Language="JavaScript" alert("手机号码格式有误");</Script </head </html &#39; . "<meta http-equiv=\"refresh\" content=\"0;url=login.html\" ";//手机号码格式不对
}
}
//方法：邮箱格式验证
function checkEmail($email){
$preg = &#39;/^(\w{1,25})@(\w{1,16})(\.(\w{1,4})){1,3}$/&#39;;
if(preg_match($preg, $email)){
return true;
}else{
echo &#39;<html <head <Script Language="JavaScript" alert("y邮箱格式有误");</Script </head </html &#39; . "<meta http-equiv=\"refresh\" content=\"0;url=login.html\" ";
}
}

logout.php

<?php
//退出登录并跳转到登录页面
unset($_SESSION[&#39;username&#39;]);
setcookie("username","",time()-1);  //清空cookie
setcookie("password","",time()-1);
header("location: login.html ");
index.php
<?php
session_start();
if(empty($_COOKIE[&#39;username&#39;])&&empty($_COOKIE[&#39;password&#39;])){
if(isset($_SESSION[&#39;username&#39;]))
echo "登录成功，欢迎您".$_SESSION[&#39;username&#39;]."<a href=&#39;logout.php&#39; 退出登录</a ";
else
echo "你还没有登录，<a href=&#39;login.html&#39; 请登录</a ";
}
else
echo "登录成功，欢迎您：".$_COOKIE[&#39;username&#39;]."<a href=&#39;logout.php&#39; 退出登录</a ";

The implementation methods of verification code and database have been written before and will not be repeated here.

Recommended learning: "

PHP Video Tutorial"

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