GET, POST, VARIABLE, ARRAY, SESSION IN PHP - LOGIN AUTHOTICATION

GET and POST:
GET and POST are two common HTTP methods used to send data from a client (e.g., a web browser) to a server. In the context of login authentication, you'll typically use the POST method to submit sensitive information like usernames and passwords securely. The main difference between them is how they handle data:
GET: Data is sent in the URL's query string, visible in the address bar, and is limited in size. It is not suitable for sensitive data as it can be easily intercepted or bookmarked.

POST: Data is sent in the request body, not visible in the URL, and can handle larger amounts of data. It is the recommended method for handling login credentials as it provides more security.

Variables in PHP:
Variables in PHP are used to store data. They start with a dollar sign ($) followed by the variable name. PHP is loosely typed, so you don't need to explicitly declare variable types. For example:
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$username = $_POST['username'];
$password = $_POST['password'];
In this case, we're assigning the values sent via the POST method (username and password) to PHP variables.

Arrays in PHP:
An array is a data structure in PHP that can hold multiple values under a single variable name. It's useful for storing and organizing related data. In the context of login authentication, you might use an array to store user credentials for comparison during the login process.

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