What are the potential pitfalls of setting global variables directly in a URI using $_GET in PHP?

Setting global variables directly in a URI using $_GET in PHP can lead to security vulnerabilities such as injection attacks and data manipulation. To mitigate this risk, it is recommended to sanitize and validate the input received from the URI before using it in your code. 

// Sanitize and validate the input received from the URI
$id = isset($_GET['id']) ? filter_var($_GET['id'], FILTER_SANITIZE_NUMBER_INT) : null;

// Use the sanitized input in your code
if ($id !== null) {
    // Your code here
}

Keywords

global variables URI $_GET security vulnerability data manipulation

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