Use PHP to realize automatic login storage mechanism within a week

This article mainly introduces the use of PHP to realize automatic login storage mechanism (cookie, session, localStorage) within a week, which can achieve free login within a week. Interested friends can refer to it.

Cookie, session, and localStorage should be the three most troublesome for programmers. I will use the username and password of the simple login interface to explain.

1. Cookies are used to store user-related data. The storage location is local to the user:

The first is the login interface definition:

<form action="server.php" method="post"> 
        <input type="text" name="username" class="username" placeholder="Username"> 
        <input type="password" name="password" class="password" placeholder="Password"> 
        <button type="submit">Sign me in</button> 
        <p class="error"><span>+</span></p> 
      </form>

Everyone knows the above code, it is a form. Then it is the action server.php server processing,

<?php 
/** 
 * Created by PhpStorm. 
 * User: Administrator 
 * Date: 2016-7-19 
 * Time: 11:50 
 */ 
include "data.php"; 
header("Content-type:text/html;charset=utf-8"); 
//echo "ddd"; 
if ($_SERVER["REQUEST_METHOD"] == "POST") {//第一步 
//  echo "ddd1"; 
  if ($_POST["username"] == $info["username"] && $_POST["password"] == $info["password"]) {//第二步 
    $myArr = $_POST; 
    $myArr = array_merge($myArr, array("loginIP" => $_SERVER["REMOTE_ADDR"], "loginTime" => time())); 
    se($myArr); 
    setcookies($_POST["username"], $_POST["password"]); 
    setStroage($_POST["username"], $_POST["password"]); 
    echo "<script> 
   window.location.href=&#39;index.php&#39;; 
  </script>"; 
  } 
} else { 
  echo "<script> 
alert(&#39;请登录&#39;); 
window.location.href=&#39;login.html&#39;; 
</script>"; 
} 
//通过session保存到服务器 
function se(array $arr) 
{ 
  session_start(); 
  $_SESSION["username"] = $arr["username"]; 
  $_SESSION["password"] = $arr["password"]; 
  $_SESSION["loginIP"] = $arr["loginIP"]; 
  $_SESSION["loginTime"] = $arr["loginTime"]; 
} 
//通过cookie保存到本地 
function setCookies($username, $password) 
{ 
  setcookie("username", $username, time() + 120); 
  setcookie("password", $password, time() + 120); 
} 
 
//echo "<script> 
// 
//  localStorage.setItem(&#39;username&#39;,&#39;$username&#39;); 
//localStorage.setItem(&#39;password&#39;," . "&#39;" . $password . "&#39;" . "); 
//</script>"; 
function setStroage($username, $password){ 
  echo "<script> 
  localStorage.setItem(&#39;username&#39;," . "&#39;" . $username . "&#39;" . "); 
  localStorage.setItem(&#39;password&#39;," . "&#39;" . $password . "&#39;" . "); 
  </script>"; 
}

is loaded with a data.php actually contains a piece of data,

$info=array("username"=>"admin","password"=>"admin");

This data is mainly used to check whether the entered user name and password are correct.

First of all, in the server, judge whether it is a post request. If not, you will be prompted to log in again and return to the login interface. After confirming that it is a post, you will then judge whether the information is entered correctly. If it is correct, set the cookie. The following code Let me explain one by one

$myArr = $_POST;//把post传过来的数据放在myarr;里面 
    $myArr = array_merge($myArr, array("loginIP" => $_SERVER["REMOTE_ADDR"], "loginTime" => time()));//这是穿的另外两个参数,一个是用户登录地址,另一个是cookie存活时间(会在寻获时间以为消失) 
    se($myArr); 
    setcookies($_POST["username"], $_POST["password"]);//这个是设置cookie,把传过来的两个值设置成cookie,会有一个getCookie进行接收 
    setStroage($_POST["username"], $_POST["password"]); 
    echo "<script> 
  window.location.href=&#39;index.php&#39;;

In fact, at this time the cookie has been stored according to the time we set, and then what we need to do is the login-free function , the processing of the background server, just like when we log in to other software, we will be prompted to waive the login password within a week.

is the following code:

function intialLoadInfo(){ 
    $("input:text").val(getCoolieByKey("username"));//这两个就是吧下面获取的之前输入过的用户名和密码进行自动填写(实现目的) 
    $("input:password").val(getCoolieByKey("password")); 
  } 
  //通过key值获取cookie 
  function getCoolieByKey(key){ 
    var cookie=document.cookie.split(";");//这行代码是吧cookie的值进行分离(split),以便于下面遍历(分离后就是一个数组一样) 
    for(var i=0;i<cookie.length;i++){//遍历长度 
      var value=cookie[i].trim();//去掉空格 
      if (value.indexOf(key)==0){//判断是不是第一个值 
        val=value.split("="); 
        console.log(val[0]); 
        return val[1]; 
      } 
    } 
  }

The first method above executes getCookieByKey(key);

The parameter received by this function with parameters is the myArr data we encapsulated above;

The detailed explanation is in the code, you can refer to it.

2.session:session is used to store user information on the server side. When the browser is closed, it will be automatically destroyed;

session_start();

The super array $_SESSION can realize the setting and reading of session;

The code is as follows:

function se(array $arr) 
{ 
  session_start(); 
  $_SESSION["username"] = $arr["username"]; 
  $_SESSION["password"] = $arr["password"]; 
  $_SESSION["loginIP"] = $arr["loginIP"]; 
  $_SESSION["loginTime"] = $arr["loginTime"]; 
}

First of all, we will use the above code, which also obtains four attributes and puts them in our $_SESSION; store them:

Then the above code, you can see there is a se

$myArr = array_merge($myArr, array("loginIP" => $_SERVER["REMOTE_ADDR"], "loginTime" => time()));//这是穿的另外两个参数,一个是用户登录地址,另一个是cookie存活时间(会在寻获时间以为消失) 
    se($myArr);

This is written for session;

It mainly stores four attributes, username.password.IP.time

It is also commented in the above code; in fact, now we can check the session we created in the session.

3. LocalStorage on the JS side: the local storage method provided by HTML5 (can be called a "key-value pair" database);

Set data: localStorage.setItem(" key","value");
Read data: localStorage.getItem("key");The read result is a string;
Delete data: localStorage.removeItem("key");

The detailed code is as follows:

The js file written under the html is Then it is the implementation:

$(function (){ 
    if (localStorage.getItem("username")!=""&&localStorage.getItem("password")!=""){ 
      document.getElementById("username").value=localStorage.getItem("username"); 
      document.getElementById("password").value=localStorage.getItem("password"); 
 
    } 
  });

This function is mainly to create the

function setStroage($username, $password){ 
  echo "<script> 
  localStorage.setItem(&#39;username&#39;," . "&#39;" . $username . "&#39;" . "); 
  localStorage.setItem(&#39;password&#39;," . "&#39;" . $password . "&#39;" . "); 
  </script>"; 
}

created with php. The above is the entire content of this article. I hope it will be helpful to everyone’s study. .

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