These slides belong to https://CustomizeWoo.com, a technical video course that shows you how to override WooCommerce pages and elements without using plugins. You can watch me code and learn by example. A series of videos, screencasts, examples and exercises will help you feel more confident about WooCommerce customization, child themes, hooks and CSS/PHP snippets. Watch and re-watch each video how many times you like, get lifetime access to me via the comment section, exercise as much as possible and keep learning. Access your free videos or buy the course via https://businessbloomer.com/customizewoo-master-woocommerce-online-course/

1. Getting Ready:
Filter Hooks
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2. WordPress Filter Hooks 1/2
Allow you to edit / "filter" content just
before this is given back to WordPress
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3. WordPress Filter Hooks 2/2
tl;dr: if WP/WC provide apply_filters(
'hook_name' ) you can edit that content
before it is processed
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4. Filter Hooks - Example
apply_filters(
'woocommerce_product_description_heading',
__( 'Description', 'woocommerce' ) )
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5. Filter Hooks - Example
add_filter(
'woocommerce_product_description_heading',
'edit_heading' );
function edit_heading() {
// do something to edit the heading
}
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6. Filter Hooks: apply_filters Syntax
apply_filters( 'hook_name', $value, $args );
● kindly provided by WP/themes/plugins
● $value = filterable content
● $args = variables you can "pass" and use in
your hooked function
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7. Filter Hooks: add_filter Syntax
add_filter( 'hook_name', 'func_name', 10, 1 );
● goes in functions.php @ child theme
● same "hook_name" as per apply_filters
● hooked function
● priority = 10 by default / if omitted
● args = 1 by default / if omitted
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8. Filter Hooks: function Syntax
function func_name( $value, $args ) {
// do something to $value
return $value;
}
● goes in functions.php @ child theme
● return $value back to the system
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9. Filter Hooks: tl;dr Syntax
apply_filters( 'hook_name', $val, $arg1 );
add_filter( 'hook_name', 'func_name', 10, 2 );
function func_name( $val, $arg1 ) { }
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10. Filter Hooks: WC Example
apply_filters( 'woocommerce_checkout_show_terms', true );
add_filter( 'woocommerce_checkout_show_terms', 'no_terms' );
function no_terms( $val ) {
$val = false;
return $val;
}
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11. Filter Hooks: WC Example
apply_filters( 'woocommerce_checkout_show_terms', true );
add_filter( 'woocommerce_checkout_show_terms', 'no_terms' );
function no_terms( $val ) {
$val = false;
return $val;
}
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12. Filter Hooks: Project Checklist
1. Project Specs e.g. "Edit Add Cart Button Label"
2. Search for apply_filters()
3. Hook your function with add_filter()
4. Write your filter function
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13. Filter Hooks: Recap
● Help us override WooCommerce etc.
without editing core / template files
(add_filter() and function go in functions.php
@ child theme)
● Not easy to find/code vs do_action() - need
lots of practice and smart file search
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