What are the potential pitfalls of relying on register_globals in PHP?

Relying on register_globals in PHP can lead to security vulnerabilities as it allows external input to automatically create global variables, making it easier for attackers to manipulate and inject malicious code. To solve this issue, it is recommended to disable the register_globals setting in the php.ini configuration file and instead use superglobal arrays like $_GET, $_POST, and $_REQUEST to access form data.

// Disable register_globals in php.ini
// Change register_globals = On to register_globals = Off