What are some common pitfalls when validating email addresses in PHP?

One common pitfall when validating email addresses in PHP is relying solely on built-in functions like filter_var with the FILTER_VALIDATE_EMAIL flag, as this may not catch all edge cases. To improve validation accuracy, consider using regular expressions to perform more thorough checks on the email format. 

$email = "example@example.com";

if (preg_match('/^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$/', $email)) {
    echo "Valid email address";
} else {
    echo "Invalid email address";
}

Keywords

filter_var regex validation email error handling

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