How can PHP be used to validate email addresses before sending emails?

To validate email addresses before sending emails in PHP, you can use the built-in filter_var function with the FILTER_VALIDATE_EMAIL filter option. This function will check if the email address is in a valid format before proceeding with sending the email.

$email = "example@example.com";

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Email address is valid, proceed with sending email
    // Your email sending code here
} else {
    // Email address is not valid, handle the error accordingly
    echo "Invalid email address";
}