Why is it recommended to avoid activating register_globals in PHP?

Activating register_globals in PHP can lead to security vulnerabilities as it allows external input to overwrite global variables, potentially leading to injection attacks and other security risks. It is recommended to avoid using register_globals and instead use superglobal arrays like $_GET, $_POST, and $_REQUEST to access user input. 

// Example of how to access user input without using register_globals
$username = $_POST['username'];
$password = $_POST['password'];

// Use the variables $username and $password in your code securely

Keywords

security vulnerability deprecated feature global variables data manipulation code injection

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