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[PHP] PHP - MySQL Login

PHP - MySQL Login

Acest tutorial demonstrează cum se creează o pagină de conectare cu baza de date MySQL. Înainte de a intra în cod, ar fi nevoie de privilegii speciale pentru a crea sau pentru a șterge o bază de date MySQL. 

Config.php

Fișierul Config.php are informații despre configurația bazei de date MySQL.

<?php
   define('DB_SERVER', 'localhost:3036');
   define('DB_USERNAME', 'root');
   define('DB_PASSWORD', 'rootpassword');
   define('DB_DATABASE', 'database');
   $db = mysqli_connect(DB_SERVER,DB_USERNAME,DB_PASSWORD,DB_DATABASE);
?>

Login.php

Fisierul Login.php conține informații despre scriptul php și scriptul HTML pentru a vă autentifica.

?php
   include("config.php");
   session_start();
   
   if($_SERVER["REQUEST_METHOD"] == "POST") {
      // username and password sent from form 
      
      $myusername = mysqli_real_escape_string($db,$_POST['username']);
      $mypassword = mysqli_real_escape_string($db,$_POST['password']); 
      
      $sql = "SELECT id FROM admin WHERE username = '$myusername' and passcode = '$mypassword'";
      $result = mysqli_query($db,$sql);
      $row = mysqli_fetch_array($result,MYSQLI_ASSOC);
      $active = $row['active'];
      
      $count = mysqli_num_rows($result);
      
      // If result matched $myusername and $mypassword, table row must be 1 row
		
      if($count == 1) {
         session_register("myusername");
         $_SESSION['login_user'] = $myusername;
         
         header("location: welcome.php");
      }else {
         $error = "Your Login Name or Password is invalid";
      }
   }
?>
<html>
   
   <head>
      <title>Login Page</title>
      
      <style type = "text/css">
         body {
            font-family:Arial, Helvetica, sans-serif;
            font-size:14px;
         }
         label {
            font-weight:bold;
            width:100px;
            font-size:14px;
         }
         .box {
            border:#666666 solid 1px;
         }
      </style>
      
   </head>
   
   <body bgcolor = "#FFFFFF">
	
      <div align = "center">
         <div style = "width:300px; border: solid 1px #333333; " align = "left">
            <div style = "background-color:#333333; color:#FFFFFF; padding:3px;"><b>Login</b></div>
				
            <div style = "margin:30px">
               
               <form action = "" method = "post">
                  <label>UserName  :</label><input type = "text" name = "username" class = "box"/><br /><br />
                  <label>Password  :</label><input type = "password" name = "password" class = "box" /><br/><br />
                  <input type = "submit" value = " Submit "/><br />
               </form>
               
               <div style = "font-size:11px; color:#cc0000; margin-top:10px"><?php echo $error; ?></div>
					
            </div>
				
         </div>
			
      </div>

   </body>
</html>

După conectarea reușită, va afișa pagina de bun venit. (welcome.php)

<?php
   include('session.php');
?>
<html">
   
   <head>
      <title>Welcome </title>
   </head>
   
   <body>
      <h1>Welcome <?php echo $login_session; ?></h1> 
      <h2><a href = "logout.php">Sign Out</a></h2>
   </body>
   
</html>

Logoutpage.php

Pagina de deconectare conține informații despre modul de deconectare din sesiune

<?php
   session_start();
   
   if(session_destroy()) {
      header("Location: login.php");
   }
?>

Session.php va verifica sesiunea, dacă nu există sesiune, se va redirecționa către pagina de conectare.

<?php
   include('config.php');
   session_start();
   
   $user_check = $_SESSION['login_user'];
   
   $ses_sql = mysqli_query($db,"select username from admin where username = '$user_check' ");
   
   $row = mysqli_fetch_array($ses_sql,MYSQLI_ASSOC);
   
   $login_session = $row['username'];
   
   if(!isset($_SESSION['login_user'])){
      header("location:login.php");
      die();
   }
?>

Sursa:tutorialspoint.com

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