Add Custom Validation to Registration Fields

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Add Custom Validation to Registration Fields

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Understanding the Hook: registration_errors

The registration_errors filter allows you to validate custom fields during user registration.

Why Use This Hook?

  • Enforce specific input rules for custom fields.
  • Prevent invalid or incomplete registrations.

How It Works

Check the submitted field values and return errors if necessary.

Code Example

function validate_custom_registration_fields($errors, $sanitized_user_login, $user_email) {
    if (empty($_POST['phone'])) {
        $errors->add('phone_error', '<strong>ERROR</strong>: Please enter your phone number.');
    }
    return $errors;
}
add_filter('registration_errors', 'validate_custom_registration_fields', 10, 3);

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