WooCommerce hooks for customization in Wordpress - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add a custom message after the product title using a WooCommerce hook.

Wordpress

<?php
add_action('[1]', 'custom_message_after_title');
function custom_message_after_title() {
    echo '<p>Thank you for checking this product!</p>';
}
?>

Drag options to blanks, or click blank then click option'

Awoocommerce_before_shop_loop_item_title

Bwoocommerce_single_product_summary

Cwoocommerce_after_shop_loop_item_title

Dwoocommerce_before_main_content

Attempts:

3 left

💡 Hint

Common Mistakes

Using a hook that runs before the title instead of after.

Choosing a hook that runs on the single product page instead of the product list.

The hook woocommerce_after_shop_loop_item_title runs right after the product title in the product list, perfect for adding a message there.

2fill in blank

medium

Complete the code to change the number of products displayed per page using a WooCommerce filter.

Wordpress

<?php
add_filter('[1]', 'custom_products_per_page');
function custom_products_per_page($cols) {
    return 12;
}
?>

Drag options to blanks, or click blank then click option'

Aloop_shop_per_page

Bwoocommerce_product_query

Cwoocommerce_loop_shop_columns

Dwoocommerce_products_per_page

Attempts:

3 left

💡 Hint

Common Mistakes

Using a filter that changes columns instead of products per page.

Trying to use an action hook instead of a filter.

The filter loop_shop_per_page lets you set how many products show on shop pages.

3fill in blank

hard

Fix the error in the code to correctly remove the default WooCommerce breadcrumb.

Wordpress

<?php
remove_action('woocommerce_before_main_content', [1], 20);
?>

Drag options to blanks, or click blank then click option'

A'woocommerce_breadcrumb'

B'woocommerce_breadcrumbs'

C'woocommerce_default_breadcrumb'

D'woocommerce_breadcrumb_function'

Attempts:

3 left

💡 Hint

Common Mistakes

Using a plural form like 'woocommerce_breadcrumbs' which does not exist.

Adding quotes incorrectly or missing them.

The correct function to remove is woocommerce_breadcrumb, which is hooked to woocommerce_before_main_content at priority 20.

4fill in blank

hard

Fill both blanks to add a custom text before the add to cart button on single product pages.

Wordpress

<?php
add_action('[1]', '[2]');
function custom_text_before_add_to_cart() {
    echo '<p><strong>Special offer:</strong> Free shipping today!</p>';
}
?>

Drag options to blanks, or click blank then click option'

Awoocommerce_before_add_to_cart_button

Bwoocommerce_after_add_to_cart_button

Ccustom_text_before_add_to_cart

Dcustom_text_after_add_to_cart

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong hook that runs after the button.

Mismatching the function name in add_action and the function definition.

The hook woocommerce_before_add_to_cart_button runs before the add to cart button. The function name must match the callback added.

5fill in blank

hard

Fill all three blanks to create a filter that changes the 'Add to cart' button text on product archives.

Wordpress

<?php
add_filter('[1]', '[2]');
function [3]($text) {
    return 'Buy Now';
}
?>

Drag options to blanks, or click blank then click option'

Awoocommerce_product_add_to_cart_text

Bcustom_add_to_cart_text

Dwoocommerce_add_to_cart_text

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent filter name.

Mismatching function names between add_filter and function definition.

The filter woocommerce_product_add_to_cart_text changes the button text. The function name must match the callback added.

Practice

1. What is the main purpose of WooCommerce hooks in customizing a store?

easy

A. To disable WooCommerce features permanently

B. To directly modify WooCommerce core plugin files

C. To safely add or change features without editing core files

D. To create new WooCommerce plugins from scratch

Solution

1. Step 1: Understand what hooks do

   Hooks let you add or change features without touching core plugin files, keeping updates safe.

2. Step 2: Compare options

   Directly modifying core files or disabling features permanently is unsafe or unrelated to hooks.

3. Final Answer:

   To safely add or change features without editing core files -> Option C

4. Quick Check:

   Hooks = safe customization [OK]

Hint: Hooks let you add or change without touching core files [OK]

Common Mistakes:

• Thinking hooks edit core plugin files directly
• Confusing hooks with plugin creation
• Believing hooks disable features permanently

2. Which of the following is the correct syntax to add a custom function to a WooCommerce action hook?

easy

A. add_action('woocommerce_before_checkout_form', 'my_custom_function');

B. add_filter('woocommerce_before_checkout_form', 'my_custom_function');

C. add_hook('woocommerce_before_checkout_form', 'my_custom_function');

D. hook_action('woocommerce_before_checkout_form', 'my_custom_function');

Solution

1. Step 1: Identify correct function for actions

   WooCommerce uses add_action to add functions to action hooks.

2. Step 2: Check syntax correctness

   add_action('woocommerce_before_checkout_form', 'my_custom_function'); uses add_action with correct parameters; others use wrong functions or names.

3. Final Answer:

   add_action('woocommerce_before_checkout_form', 'my_custom_function'); -> Option A

4. Quick Check:

   Use add_action for actions [OK]

Hint: Use add_action for actions, add_filter for filters [OK]

Common Mistakes:

• Using add_filter instead of add_action for actions
• Using non-existent functions like add_hook or hook_action
• Mixing up action and filter hook functions

3. What will be the output of this code snippet added to a WooCommerce store?

add_filter('woocommerce_product_get_price', function($price) { return $price * 0.9; });

medium

A. All product prices will be reduced by 10%

B. All product prices will increase by 10%

C. No change to product prices

D. Syntax error, code will not run

Solution

1. Step 1: Understand the filter hook used

   The filter woocommerce_product_get_price modifies the product price before display.

2. Step 2: Analyze the callback function

   The function multiplies the price by 0.9, reducing it by 10%.

3. Final Answer:

   All product prices will be reduced by 10% -> Option A

4. Quick Check:

   Filter changes price = 10% off [OK]

Hint: Filter modifies data; multiplying by 0.9 reduces price [OK]

Common Mistakes:

• Thinking it increases price instead of reducing
• Assuming no effect without priority argument
• Confusing add_filter with add_action

4. Identify the error in this WooCommerce hook usage:

add_action('woocommerce_before_cart', 'display_message');
function display_message() {
  echo 'Welcome to your cart!';
}

medium

A. Hook name 'woocommerce_before_cart' does not exist

B. No error, code works correctly

C. Echo cannot be used inside hooked functions

D. Function display_message is defined after add_action call

Solution

1. Step 1: Check function definition timing

   In PHP, functions can be defined after usage if in the same file, so no error here.

2. Step 2: Verify hook name and usage

   'woocommerce_before_cart' is a valid WooCommerce action hook; echo is allowed in hooked functions.

3. Final Answer:

   No error, code works correctly -> Option B

4. Quick Check:

   Valid hook and function = works [OK]

Hint: Functions can be defined after add_action in same file [OK]

Common Mistakes:

• Assuming function must be defined before add_action
• Thinking echo is disallowed in hooks
• Believing hook name is invalid without checking docs

5. You want to add a custom message only on the WooCommerce checkout page before the form starts. Which hook and method combination is best to achieve this without modifying core files?

hard

A. Use add_filter('woocommerce_checkout_message', 'custom_message_function');

B. Use add_action('woocommerce_after_checkout_form', 'custom_message_function');

C. Directly edit checkout template file to add message

D. Use add_action('woocommerce_before_checkout_form', 'custom_message_function');

Solution

1. Step 1: Identify correct hook location

   'woocommerce_before_checkout_form' runs before the checkout form, perfect for adding a message before it.

2. Step 2: Choose correct method

   Use add_action to add new content; filters modify existing data, so add_filter is not suitable here.

3. Step 3: Avoid direct template edits

   Editing core template files is unsafe and breaks updates; hooks keep customization safe.

4. Final Answer:

   Use add_action('woocommerce_before_checkout_form', 'custom_message_function'); -> Option D

5. Quick Check:

   Action hook before form + add_action = correct [OK]

Hint: Add message before form with add_action on before_checkout_form [OK]

Common Mistakes:

• Using add_filter instead of add_action for adding content
• Editing core template files directly
• Using after_checkout_form hook which shows message too late