User login and logout functionality is a basic requirement for many web applications. In this article, we will look at a simple implementation of login and logout functionality using PHP sessions.<\/p>\n\n\n\n
The login process verifies the username and password against the database and stores the authenticated user’s name in a PHP session. The logout process destroys the session and redirects the user back to the login page.<\/p>\n\n\n\n
Before starting, you can also refer to our previous article:<\/p>\n\n\n\n
Basic Insert, Delete, Update, Database and Image Upload Using PHP<\/strong><\/p>\n\n\n\n Before implementing the login and logout functionality, make sure you have:<\/p>\n\n\n\n Create a file named The following code connects to the database, starts a PHP session, validates the submitted username and password, and stores the username in the session after successful authentication.<\/p>\n\n\n\n Create a file named The logout script starts the session, destroys the existing session, and redirects the user to the login page.<\/p>\n\n\n\n The basic flow is:<\/p>\n\n\n\n PHP sessions provide a simple way to maintain login information between requests. In this basic implementation, the login process verifies the user credentials and stores the username in a session, while the logout process destroys the session and redirects the user to the login page.<\/p>\n\n\n\n PHP sessions allow user information to be maintained across multiple page requests after successful authentication.<\/p>\n\n\n\n The logout script calls The concept of using sessions for login and logout is still applicable. However, the How to Install Apache, PHP, and MySQL on Red Hat 7?<\/a><\/p>\n\n\n\nPrerequisites<\/h2>\n\n\n\n
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Implementation<\/h2>\n\n\n\n
1. Login Using PHP<\/h3>\n\n\n\n
login.php<\/code>.<\/p>\n\n\n\n$query=mysql_connect(\"localhost\",\"root\",\"\");\nmysql_select_db(\"demo\",$query);\nsession_start();\nif(isset($_POST['send']))\n{\n$name=$_POST['name'];\n$password=$_POST['password'];\nif($name!=\"\" && $password!=\"\")\n{ \n$s=mysql_query(\"select *from reg where name = '$name' AND password = '$password'\");\n$a=mysql_fetch_array($s);\n$count=mysql_num_rows($s);\nif($count==0)\n{\necho \"user does not exist\";\n}\nelse\n{\n$_SESSION['name']=$a['name'];\nheader(\"location:indedx.php\");\n}\n}\n}\n<!DOCTYPE html>\n<html>\n<head>\n <title><\/title>\n<\/head>\n<body>\n<form action=\"\" method=\"post\">\n<table width=\"400\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\" >\n <tr>\n <td>username<\/td>\n <td>:<\/td>\n <td><input type=\"text\" name=\"name\" \/><\/td>\n \n <\/tr>\n <tr>\n <td>password<\/td>\n <td>:<\/td>\n <td><input type=\"password\" name=\"password\" \/><\/td>\n <\/tr>\n <tr>\n <td><input type=\"submit\" name=\"send\" \/><\/td>\n <\/tr>\n<\/table>\n<\/form>\n<\/body>\n<\/html><\/pre>\n\n\n\n2. Logout Using PHP<\/h3>\n\n\n\n
logout.php<\/code>.<\/p>\n\n\n\n<?php \nsession_start();\nsession_destroy();\nheader(\"location:login.php\");\n?><\/pre>\n\n\n\n
3. How the Login and Logout Flow Works<\/h3>\n\n\n\n
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login.php<\/code>.<\/li>\n<\/ol>\n\n\n\nConclusion<\/h2>\n\n\n\n
Frequently Asked Questions<\/h2>\n\n\n\n
1. Why are PHP sessions used for login?<\/h3>\n\n\n\n
2. How does PHP logout work?<\/h3>\n\n\n\n
session_destroy()<\/code> to destroy the current session and then redirects the user to the login page.<\/p>\n\n\n\n3. Can this login implementation be used with modern PHP?<\/h3>\n\n\n\n
mysql_*<\/code> functions used in this original example are no longer supported in modern PHP. Modern implementations should use PDO or MySQLi with prepared statements.<\/p>\n\n\n\nRelated Articles<\/h2>\n\n\n\n