What potential pitfalls should be considered when validating email addresses in PHP?

One potential pitfall when validating email addresses in PHP is relying solely on regular expressions, which may not cover all valid email formats. To address this, it's recommended to use PHP's built-in filter_var function with the FILTER_VALIDATE_EMAIL filter, which provides a more reliable validation method. 

$email = "example@example.com";

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Valid email address";
} else {
    echo "Invalid email address";
}

Keywords

filter_var email validation regular expressions RFC standards validation errors

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