What are some best practices for passing and maintaining variables in PHP applications?

When passing and maintaining variables in PHP applications, it is best practice to use superglobal arrays like $_GET, $_POST, and $_SESSION to securely transfer data between pages or store it for future use. It's important to properly sanitize and validate user input to prevent security vulnerabilities. Additionally, using functions like htmlentities() or htmlspecialchars() can help prevent cross-site scripting attacks. 

// Passing variables using $_GET superglobal array
$id = $_GET['id']; // Retrieving the value passed in the URL
$id = filter_var($id, FILTER_SANITIZE_NUMBER_INT); // Sanitizing the input

// Storing variables using $_SESSION superglobal array
session_start(); // Starting the session
$_SESSION['username'] = 'JohnDoe'; // Storing the username for future use

Keywords

variable passing variable scope global variables session variables superglobals

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