What are the potential pitfalls of not updating PHP coding practices to use newer predefined variables like $_POST, $_GET, and others?

Not updating PHP coding practices to use newer predefined variables like $_POST, $_GET, and others can lead to security vulnerabilities such as SQL injection attacks and cross-site scripting. It is important to use these predefined variables as they provide a safer and more secure way to handle user input. 

// Old way of handling form data
$username = $_REQUEST['username'];
$password = $_REQUEST['password'];

// Updated way using predefined variables
$username = $_POST['username'];
$password = $_POST['password'];

Keywords

predefined variables $_POST $_GET PHP coding practices potential pitfalls

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