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Mastering WooCommerce PHP Snippets: A Comprehensive Guide

WooCommerce is a widely-used, customizable eCommerce platform built on WordPress. It allows developers to create unique, user-friendly online stores. One of the most powerful features of WooCommerce is its ability to support custom PHP snippets. In this comprehensive guide, we will explore the process of mastering WooCommerce PHP snippets, including the basics of PHP, how to safely add snippets, and a variety of useful examples.

Understanding PHP and Its Importance in WooCommerce

PHP, or Hypertext Preprocessor, is a server-side scripting language designed for web development. It is the backbone of WordPress and WooCommerce, as it allows developers to create dynamic content, interact with databases, and execute server-side tasks. WooCommerce relies heavily on PHP to function, and custom PHP snippets can extend its capabilities even further. By mastering WooCommerce PHP snippets, developers can create more efficient, tailored online stores that cater to the specific needs of their clients or projects.

How to Safely Add PHP Snippets to Your WooCommerce Site

Before diving into the world of WooCommerce PHP snippets, it is essential to understand how to safely add them to your site. Improperly adding PHP snippets can result in errors or even break your site. To avoid this, follow the steps below:

Create a Child Theme

A child theme is a separate theme that inherits the functionality and styling of its parent theme. By creating a child theme, you can safely modify the parent theme without losing your changes when the parent theme is updated. This is an essential step when working with custom PHP snippets in WooCommerce. To create a child theme:

  1. Create a new folder in your wp-content/themes directory, with a name that indicates it is a child theme (e.g., storefront-child).
  2. Create a style.css file in the new folder, and add the following header information, replacing the necessary details with your information:

Theme Name: Storefront Child
Theme URI: http://example.com/storefront-child/
Description: My first child theme for Storefront
Author: Your Name
Author URI: http://example.com
Template: storefront
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Tags: light, e-commerce
Text Domain: storefront-child

Once your child theme is set up, activate it through the WordPress dashboard by navigating to Appearance > Themes.

Add Custom PHP Snippets to functions.php

After creating a child theme, you can safely add custom PHP snippets by creating a functions.php file within the child theme folder. This file will execute any PHP code you add to it, allowing you to modify or extend the functionality of your WooCommerce site. To add a custom snippet:

  1. Create a new file named functions.php within your child theme folder.
  2. Open the file using a text editor, and add the following code at the beginning:

// Your custom PHP snippets will go here

Now you can add your custom PHP snippets within the opening and closing PHP tags.

Useful WooCommerce PHP Snippets

With an understanding of how to safely add PHP snippets to your WooCommerce site, let’s explore some examples that can enhance your store’s functionality.

1. Change the Number of Products Displayed per Page

To modify the number of products displayed per page, add the following code to your child theme’s functions.php file:

add_filter( 'loop_shop_per_page', 'typek_new_loop_shop_per_page', 20 );
function typek_new_loop_shop_per_page( $cols ) {
// Change the number 12 to the desired number of products per page
return 12;

2. Add a Custom Field to the WooCommerce Checkout Page

Adding a custom field to the checkout page can help you collect additional information from customers. To do this, add the following code to your child theme’s functions.php file:

// Add the custom field to the checkout page
add_action( 'woocommerce_after_order_notes', 'typek_custom_checkout_field' );
function typek_custom_checkout_field( $checkout ) {
woocommerce_form_field( 'custom_field', array(
'type' => 'text',
'class' => array('form-row-wide'),
'label' => __('Custom Field'),
'placeholder' => __('Enter your custom text here'),
), $checkout->get_value( 'custom_field' ));
// Save the custom field data to the order
add_action( 'woocommerce_checkout_update_order_meta', 'typek_save_custom_checkout_field' );
function typek_save_custom_checkout_field( $order_id ) {
if ( ! empty( $_POST['custom_field'] ) ) {
update_post_meta( $order_id, 'Custom Field', sanitize_text_field( $_POST['custom_field'] ));

3. Disable the Default Sorting Options on the Shop Page

To disable the default sorting options on the shop page, use the following code:

add_filter( 'woocommerce_catalog_orderby', 'typek_remove_default_sorting_options' );
function typek_remove_default_sorting_options( $options ) {
unset( $options['menu_order'] );
unset( $options['popularity'] );
unset( $options['rating'] );
unset( $options['date'] );
unset( $options['price'] );
unset( $options['price-desc'] );
return $options;

4. Automatically Set Free Shipping for Orders Above a Certain Amount

To automatically apply free shipping for orders above a specific amount, add the following code:

 add_filter( 'woocommerce_package_rates', 'typek_free_shipping_for_large_orders', 10, 2 );
 function typek_free_shipping_for_large_orders( $rates, $package ) {
   // Set the minimum order amount for free shipping
   $min_order_amount = 100;  if ( WC()->cart->subtotal >= $min_order_amount ) {
     foreach ( $rates as $rate_key => $rate ) {
       if ( 'free_shipping' !== $rate->method_id ) {
         unset( $rates[ $rate_key ] );
   return $rates;

5. Hide Prices for Non-Logged-In Users

If you want to hide product prices for users who are not logged in, use the following code:

add_action( 'init', 'typek_hide_prices_for_guests' );
function typek_hide_prices_for_guests() {
if ( ! is_user_logged_in() ) {
remove_action( 'woocommerce_after_shop_loop_item_title', 'woocommerce_template_loop_price', 10 );
remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_price', 10 );

By mastering WooCommerce PHP snippets, you can create more efficient, tailored online stores that cater to the specific needs of your clients or projects. This comprehensive guide should serve as a foundation for your journey in mastering WooCommerce PHP snippets. The examples provided can be used as starting points to customize your WooCommerce site further or inspire new ideas for custom functionality.


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