Code-Snippets-Functions/Execute a function on a child site/WooCommerce/display-all-validation-errors-my-account-registration.txt

function custom_woocommerce_process_registration_errors( $validation_errors, $username, $password, $email ){

    if ( !isset( $_POST['email'] ) || $_POST['email'] == '' ) {
        $validation_errors->add( 'email', __( 'Please enter email address.', 'woocommerce' ) );
    }

    if ( !isset( $_POST['password'] ) || $_POST['password'] == '' ) {
        $validation_errors->add( 'password', __( 'Please enter passwors.', 'woocommerce' ) );
    }
    
    return $validation_errors;
}

add_filter( 'woocommerce_process_registration_errors', 'custom_woocommerce_process_registration_errors', 10, 4 );