How can PHP functions be properly integrated into a script for email validation?

To properly integrate PHP functions for email validation in a script, you can use the built-in filter_var function with the FILTER_VALIDATE_EMAIL filter. This function will check if the provided email address is in a valid format. You can use an if statement to check the result of the filter_var function and handle the validation accordingly.

$email = "example@example.com";

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Email is valid.";
} else {
    echo "Email is not valid.";
}