What are some best practices for handling email validation in PHP, especially in user-facing applications like guestbooks?

When validating email addresses in PHP, it is important to use a combination of built-in functions and regular expressions to ensure the email is in a valid format. One common approach is to use the filter_var() function with the FILTER_VALIDATE_EMAIL filter to check if the email is valid. Additionally, you can use regular expressions to further validate the email address format. 

$email = $_POST['email'];

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

Keywords

email validation PHP user-facing applications guestbooks error handling

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