How to implement php login function

php method to implement the login function: 1. Connect and create a database; 2. Use the layui framework to determine whether the username and password input is empty; 3. Create "login.php" to determine the username and password Correctness; 4. Check the login effect.

php login function implementation

It is natural to start with the simplest function. My first task was to perform a login operation, which was actually not as simple as I imagined.

1. The first thing is to connect and create the database.

I wrote this part in model.php

$userName='root';
$passWord='';
$host='localhost';
$dataBase='login';
//创建连接
$conn=mysqli_connect($host,$userName,$passWord,$dataBase);

2. To write the front-end page, in order to become proficient in the front-end framework, I used The layui framework makes the interface, and there is a js code in front of it to determine whether the username and password input is empty

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    b2386ffb911b14667cb8f0f91ea547a7注册登录6e916e0f7d1e588d4f442bf645aedb2f
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    function InputCheck()
    {
        if (Login.username.value == "")
            {
             alert("请输入用户名!");
             Login.username.focus();
             return (false);
             }
        if (Login.password.value == "")
             {
               alert("请输入密码!");
               Login.password.focus();
            return (false);
             }
         }
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                    ad29588debfb592956c4c08606e16152用户名8c1ecd4bb896b2264e0711597d40766c
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3.login.php is used to determine the correctness of the username and password. I read about this on the Internet There are many methods, all kinds of. Before I encountered any obstacles, I decided to use a simple form first, which is to use SQL statements to query the result set of user name and password. If the result set is empty, the user does not exist.

<?php

//数据库连接
require_once &#39;model.php&#39;;
//从登录页接受来的数据
$name=$_POST[&#39;username&#39;];
$pwd=$_POST[&#39;password&#39;];
$sql="select id,username,password from user where username=&#39;$name&#39; AND password=&#39;$pwd&#39;;";
$result=mysqli_query($conn,$sql);
$row=mysqli_num_rows($result);

if(!$row){

        echo "<script>alert(&#39;密码错误，请重新输入&#39;);location=&#39;login.html&#39;</script>";

    }
    else{

        echo "<script>alert(&#39;登录成功&#39;);location=&#39;123&#39;</script>";
    };

4. File directory

5. Effect

6. Summary

Overall it is not particularly difficult because the function is very simple. The next task is to add the registration function and verification code function.

Recommended: "PHP Tutorial"

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