woocommerce_email_editor_send_preview_email │ хук-фильтр │ WC 1.0

Использование

add_filter( 'woocommerce_email_editor_send_preview_email', 'wp_kama_woocommerce_email_editor_send_preview_filter' );

/**
 * Function for `woocommerce_email_editor_send_preview_email` filter-hook.
 * 
 * @param  $data 
 *
 * @return 
 */
function wp_kama_woocommerce_email_editor_send_preview_filter( $data ){

	// filter...
	return $data;
}

$data

-

Где вызывается хук

$result = apply_filters( 'woocommerce_email_editor_send_preview_email', $data );

Где используется хук в WooCommerce

add_filter( 'woocommerce_email_editor_send_preview_email', array( $this->send_preview_email, 'send_preview_email' ), 11, 1 ); // allow for other filter methods to take precedent.