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WordPress Hooks
Zac Gordon
@zgordon
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2000+ Hooks in WordPress
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http://hookr.io/4.1.1/#index=a
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200+ Hooks Actually Use
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“Anything, Anywhere, Anytime”
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“Anything, Anywhere, Anytime”
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“Anything, Anywhere, Anytime”
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“Anything, Anywhere, Anytime”
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“Anything, Anywhere, Anytime”
Filters
}
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“Anything, Anywhere, Anytime”
Actions
}
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Filters vs Actions
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Filters modify something
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Actions do something
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Filters in Core
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$admin_title = apply_filters( 'admin_title', $admin_title );
…
wp-admin/admin-header.php
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Actions in Core
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…
…
wp-admin/admin-header.php
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What Is Possible?
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Read the Codex
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http://codex.wordpress.org/Plugin_API/Filter_Reference
http://codex.wordpress.org/Plugin_API/Action_Reference
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http://codex.wordpress.org/Plugin_API/Filter_Reference
Filters
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http://codex.wordpress.org/Plugin_API/Action_Reference
Actions
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http://codex.wordpress.org/Plugin_API/Action_Reference
Runtime
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http://codex.wordpress.org/Plugin_API/Action_Reference/init
Reference Pages
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http://hookr.io
http://wpseek.com
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$wp_filter
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";
var_export( $wp_filter );
echo “”;?
?>
theme/functions.php
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$wp_filter
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$wp_filter
http://www.rarst.net/wordpress/debug-wordpress-hooks/
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Helpful Plugins
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Simply Show Hooks
https://wordpress.org/plugins/simply-show-hooks/
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WP Query
https://wordpress.org/plugins/query-monitor/
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Back to the Code
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Power of Search
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SublimeText
Ctrl + Shift + F
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Okay, Let’s Do Something
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Deactivate something
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theme/functions.php
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Order Matters
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.plugin-override { color: #fff !important }
theme/style.css
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theme/functions.php
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Quick Review
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remove_action( ‘hook’, ‘function’ )
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remove_action( ‘hook’, ‘function’ )
add_action( ‘hook’, ‘function’, 10 )
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Hooks Open WordPress
to Your Needs
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A Few Examples
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function excerpt_length_example( $length ) {
return 15;
}
add_filter( 'excerpt_length', 'excerpt_length_example' );
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function body_class_example( $classes ) {
if( is_single() ) {
foreach( get_the_category( get_the_ID() ) as $cat )
$classes[] = 'cat-' . $cat->category_nicename;
}
return $classes;
}
add_filter( 'body_class', 'body_class_example' );
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function register_my_menus() {
register_nav_menus(
array(
'footer_menu' => __( 'Footer Menu', 'mytheme' )
)
);
}
add_action( 'init', 'register_my_menus' );
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function my_plugin_page() {
add_options_page(
'Page Title',
‘Menu Title',
'manage_options',
‘plugin-slug',
‘my_plugin_page_init’ );
}
add_action( 'admin_menu' , 'my_plugin_page' );
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function publish_post_to_slack( ) {
// Connect to Slack API
}
add_action( 'save_post', ‘publish_post_to_slack’ );
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https://teamtreehouse.com/
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Zac Gordon
wp.zacgordon.com
@zgordon
https://teamtreehouse.com/learn/wordpress