How can the use of register_globals impact the functionality of PHP scripts, especially in form processing?

When register_globals is enabled in PHP, it can lead to security vulnerabilities as it allows external variables to overwrite internal variables. This can impact the functionality of PHP scripts, especially in form processing, as it can make it easier for attackers to manipulate form data. To solve this issue, it is recommended to disable register_globals in the php.ini file.

// Disable register_globals in php.ini file
// Set register_globals to Off
register_globals = Off;