What are the limitations when using superglobal variables like $_GET in PHP?

When using superglobal variables like $_GET in PHP, one limitation is that they can be easily manipulated by users, making them vulnerable to security risks such as injection attacks. To solve this issue, it is important to sanitize and validate any data coming from $_GET before using it in your code. 

// Sanitize and validate data from $_GET before using it
$user_input = isset($_GET['user_input']) ? htmlspecialchars($_GET['user_input']) : '';

// Now you can safely use $user_input in your code
echo "User input: " . $user_input;

Keywords

superglobal variables $_GET limitations security vulnerabilities data validation

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