What role does the register_globals setting in php.ini play in PHP script execution and potential issues?

The register_globals setting in php.ini allows incoming form variables to be automatically registered as global variables in PHP scripts. This can lead to security vulnerabilities as it can be exploited by attackers to manipulate variables and potentially execute malicious code. To mitigate this risk, it is recommended to disable the register_globals setting in php.ini and instead use superglobal arrays like $_GET, $_POST, and $_REQUEST to access form variables.

// Disable register_globals in php.ini
register_globals = Off;