What are common pitfalls when validating email addresses in PHP?

Common pitfalls when validating email addresses in PHP include not using the filter_var function with the FILTER_VALIDATE_EMAIL flag, not checking for common mistakes like missing "@" symbol or invalid domain, and not considering international email addresses. To properly validate email addresses in PHP, use the filter_var function with the FILTER_VALIDATE_EMAIL flag and consider additional checks for common mistakes and international email formats. 

$email = "example@example.com";

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

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