Can the PHP parser fail, leading to the exposure of PHP source code?

Yes, the PHP parser can fail, leading to the exposure of PHP source code if error messages are not properly handled. To prevent this, it is essential to configure PHP to not display error messages to users in a production environment. This can be done by setting the `display_errors` directive to `Off` in the php.ini file or using the `ini_set()` function at the beginning of your PHP script.

// Disable error messages in production environment
ini_set('display_errors', 'Off');