I'm trying to validate an email address in PHP using `filter_var()`. I want to check if a string entered by the user is a valid email address or not. Can somebody provide me with a PHP program that does this using the `filter_var()` function?
I have recently started working on a project where user input validation is crucial. I need to ensure that only valid email addresses are accepted. I heard that the `filter_var()` function in PHP can be very helpful for this purpose. I would really appreciate it if someone could share a sample PHP program that demonstrates how to use `filter_var()` to check if a string is a valid email address.
I have read the PHP manual regarding `filter_var()`, but I'm still a bit confused about the exact implementation. It would be great if you could also explain how the different flags can be used with `filter_var()` to achieve different validations, such as filtering out email address domains that don't exist.
Thank you so much in advance!