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WordPress Hooks (Actions & Filters)

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Hooks allow code to interact with and modify other code at certain points in the WordPress page lifecycle. There are two main types of hooks: actions, which execute code when events occur; and filters, which modify data before it is sent to the browser or database. Actions are used when you want something to happen, like sending an email when a post is published. Filters are used when you want to change something, like adding text to post titles. Hooks are constructed by specifying a tag name, callback function, priority, and arguments.

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What the Hook What YOU should know about WordPress Actions & Filters M u h a m m a d K a s h i f m e @ K a s h i f . i o
Intro Muhammad Kashif F o u n d e r & C E O - M e s h P r o s M a s t e r T r a i n e r - e R o z g a a r O r g a n i z e r W C L a h o r e 2 0 1 9
How do you make changes Core/Themes/Plugins
What areHooks?
What areHooks? Hooks are a way for one piece of code to interact/modify another piece of code.
What areHooks? Hooks enable us to literally hook into parts of the WordPress page lifecycle to retrieve, insert, or modify data, or they allow us to take certain actions behind the scenes. -TOM MCFARLIN @ TUTSPLUS
What areHooks?
Types Actions Filters
Actions Functions that are executed when something happens in WordPress. For example: When a post is published Before the header is loaded Declared with add_action
Actions Functions that are executed when something happens in WordPress. You can attach custom code at theseevents:
Actions Functions that are executed when something happens in WordPress. You can attach custom code at theseevents: When a post is published, send me anemail
Actions Functions that are executed when something happens in WordPress. You can attach custom code at theseevents: When a post is published, send me anemail When the header is loaded, add some css
Functions that WordPress passes data through before it is sent tothe browser or database. Filters
Functions that WordPress passes data through before it is sent tothe browser or database. For example: When the post title isdisplayed When the author url isoutput Declared with add_filter Filters
Filters Functions that WordPress passes data through before it is sent tothe browser or database. You can attach custom code at theseevents:
Filters Functions that WordPress passes data through before it is sent tothe browser or database. You can attach custom code at theseevents: When the post title is displayed, add something
Which Hook should Iuse? Actions FiltersOR
Which Hook should Iuse? ORActions Use an action when you want something to happen Filters Use a filter when you want to change something
Info about hooks https://codex.wordpress.org/Plugin_API Example Actions wp_enqueue_scripts create_category publish_page the_title excerpt_more the_content Example Filters
How to construct a hook
How to construct a hook tag - the name of the action to attach code to your_function - the name of your custom function $priority -the order that the functions are executed $args - the number of arguments sent to your function
Breaking it down
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WordPress Hooks (Actions & Filters)