Questions tagged [hooks]

Method by which plugins and themes extend core WordPress functionality.

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63
votes
5answers
121k views

Is there a way to send HTML formatted emails with WordPress' wp_mail() function?

Is there an action_hook or something similar that could help me achieve this? I tried adding markup in a PHP string variable and just fired off an email with the wp_mail() function like so: $...
61
votes
6answers
48k views

How to get WordPress' hooks/actions run sequence?

In what order add_action hooks execute? i.e. init wp_head wp_footer after_theme_setup etc... ??? ??? ??? EDIT: I've also posted my solution.
61
votes
12answers
51k views

Passing a parameter to filter and action functions

Is a way to pass my own parameters to the function in add_filter or add_action. For example take a look in the following code: function my_content($content, $my_param) { do something... using $...
59
votes
4answers
34k views

Difference Between Filter and Action Hooks?

I have been looking at the plugin API a bit more in depth recently and I was wondering what real differences there were between action and filter hooks. They both are events that receive data as a ...
51
votes
7answers
15k views

Where can I find a list of WordPress hooks?

Where can I find a list of all the WordPress hooks and over-ridable functions (pluggable, scriptable, etc)? Edit: Plugin is listed here.
50
votes
2answers
69k views

Is there a save_post hook for custom post types?

Is there a save_post hook for custom post types? Example: save_my_post_type I know there is publish_my_post_type but I'm looking for a save hook.
47
votes
1answer
12k views

Where is the right place to register/enqueue scripts & styles

I am using WordPress 3.1.4 by now. I am confused with where (which hook) do I use: to register and/or enqueue scripts and styles on front- and back-ends? Questions: Which are right hooks to use? ...
37
votes
6answers
39k views

How to know what functions are hooked to an action/filter?

Is there a way to know what functions are hooked to a particular hook? For example if I'd like to know what functions are hooked to the wp_head hook.
35
votes
2answers
43k views

Get a list of all registered actions

I'm trying to debug a plugin which I didn't develop and I want to list all the registered actions. I've read this SO thread: WordPress: How do I get all the registered functions for 'the_content' ...
33
votes
2answers
35k views

How to hook update_post_meta and delete_post_meta?

I'm still struggling to get my head around this whole hooking into things, so I'm really stuck on trying to do the following task: If update_post_meta is fired then check to see if the meta_key is ...
32
votes
2answers
73k views

what is correct way to hook when update post

i try to hook when post is updated but all hook i try never executed except updated_post_meta add_action('updated_post_meta', 'my_function'); function my_function($post_id) { echo 'This is ...
32
votes
2answers
79k views

WordPress hooks/filters insert before content or after title

trying to insert content before the post content in my functions.php - I know how to use the regular wp hooks, but unsure how to insert into other areas. Tried this, but it kills content on any other ...
32
votes
3answers
10k views

Are there any hooks that alter the 404 logic?

Provided you have a 404 page defined in your theme, Wordpress will display a 404 page if "tag" is defined in $wp_query->query_vars, and there are no posts matching that tag. I'm writing a plugin that ...
31
votes
2answers
56k views

Is there a hook that runs after a user logs in?

I am writing a plugin that fetches some extended user info from a remote service and I need it to execute its function each time a user logs in. Is there a hook that gets fired after login that I can ...
29
votes
1answer
24k views

how to limit search to post titles?

Is there a way to limit search to post titles? I know I can modify query.php core file but there must be a way to do it with hooks right? Thanks in advance!
26
votes
3answers
95k views

Hook for post and page load

I need to run a function when a particular post or page is loaded. Is there any hook that lets me check whether a post is being displayed during page load ?
26
votes
5answers
52k views

How can I edit post data before it is saved?

I have a plugin and I would like to be able to run the post content through some filters before it is saved to the database. From looking at the plugin api, I see that two hooks that look like they ...
26
votes
3answers
29k views

How to enqueue scripts on custom post add/edit pages?

I'm trying to enqueue a JS script only when someone is adding or editing a custom post type I created called "recipes". Currently the script works ok when I do this: if (is_admin()){ ...
25
votes
4answers
51k views

Difference between do_action and add_action

This question might be wrong, I am not sure about it. Because I am not clear on this. I know add_action it is used to to hook our function to the specified function. For example add_action('wp_head'.'...
22
votes
2answers
3k views

How do filters and hooks really work in PHP

How does filters and hooks actually work in WordPress? I'm asking about something advanced. How is it implemented in PHP? E.g how does it collect all the hooks from the different plugins and "attach" ...
22
votes
3answers
2k views

How many times will this code run? (or, how rich is grandma?)

Hypothetical example but real world applicability (for someone learning, like me). Given this code: <?php function send_money_to_grandma() { internetofThings("send grandma","$1"); } ...
22
votes
5answers
8k views

How do you use a CPT as the default home page?

I have a client who's site will be making heavy use of custom post types to configure their site. But I'm between a rock and a hard place for their requested home page. In reality, the home page ...
21
votes
2answers
29k views

Trouble understanding apply_filters()

In apply_filters() apply_filters( $tag, $value, $var ... ); I'm having trouble wrapping my head around the $value and $var. I read the codex and it sounds like the $value can be modified, $var not, ...
19
votes
1answer
23k views

How can I see all the actions attached to an "add_action" hook?

I'm working with the admin bar and trying to debug some of the menus and their priorities. I know several callbacks get bound to actions, such as this one: add_action( 'admin_bar_menu', '...
19
votes
6answers
18k views

WP Cron Doesn't Execute When Time Elapses

The goal I want to use wp_schedule_single_event( ) to execute a single event that sends me an e-mail 8 minutes after the user submits a form. The issue The following code is in my functions.php: ...
18
votes
5answers
32k views

add_action hook for completely new post?

publish_post Runs when a post is published, or if it is edited and its status is "published". Action function arguments: post ID. -Plugin API Documentation I've added the publish_post hook to ...
18
votes
3answers
6k views

How to add Custom Blog Options to new blog setup form?

Seems like a simple enough requirement, but I'm struggling: I want to add an option field to the "Add New Site". A simple text option is fine. How do I do this? I need to save this custom ...
17
votes
3answers
25k views

Which hook should be used to add an action containing a redirect?

I want to build a plugin that grabs certain url params from the query string to build a new query string for the same page. I'm following the excellent the Professional WordPress Plugin Development ...
17
votes
1answer
74k views

WooCommerce: change display order of product short description and price [closed]

I'd like to move the price "$4.99–$24.99" below the product short description "Seriously. Drink a cup of this..." NSFW Image Below ( Adult Language ) Any ideas how to do this? I already have a ...
17
votes
2answers
8k views

Registering Class methods as hook callbacks

I'm not sure if I have done this correctly. As I understand it: if I have a class foo and a static method bar I can register that as the callback by passing the array array("foo","bar") as the ...
16
votes
2answers
9k views

Why do some hooks not work inside class context?

I'm pretty stumped on this one. I'm using add_action inside my plugin class to do certain things- add scripts & styles to the head, wp_ajax, etc. Here's the actions, in the __construct: function ...
15
votes
5answers
14k views

Theme Activate Hook

I would like to write a function to email me the URL of the website when my theme is activated. What is the hook initiated when the theme is activated?
15
votes
2answers
91k views

How to customize woocommerce related products? [closed]

I have the following lines of code in my website that will display the related products at the bottom of my single product page in WooCommerce... functions.php: // display upsells and related ...
15
votes
3answers
4k views

get_template_part vs action hooks in themes

It seems to me both of these afford the opportunity for the end user to modify a theme without actually editing the themes files (via child themes). My question is, is one method preferred over the ...
14
votes
4answers
8k views

Issues with title-tag and document_title_parts

Wordpress version 4.5.1 I'm trying to dynamically update page titles on a particular template. After lots of digging and learning about the wp_title() changes, I'm attempting to use ...
14
votes
6answers
5k views

How to include code only on specific pages?

I'm learning about plugins and shortcodes. I noticed that when I activate my plugin its code gets loaded on all of my pages-- even pages that don't have my shortcode. (I don't mean content vs. admin ...
13
votes
1answer
14k views

Difference between after_setup_theme and init action hooks?

What is the difference between the after_setup_theme and init action hooks? It seems they are both called right before any page in WordPress is loaded (even admin pages).
13
votes
5answers
17k views

Is there a way to set default custom fields when creating a post?

When I'm creating a new post, just after clicking "Add New", when the post editor shows, instead of having to use the dropdown and choose a custom field to use, I'd like to have some default custom ...
12
votes
2answers
18k views

Use wp init hook to call other hooks?

I want to know if it is a good practice according to WordPress theme or plugin development. add_action('init','all_my_hooks'); function all_my_hooks(){ // some initialization stuff here and then ...
12
votes
3answers
13k views

get $post in init filter or action?

It seems that $post is only available to hooks executing at certain times. I have an "init" hook that needs to pull some data from the database using the $post->ID. So far my only workaround has ...
12
votes
1answer
3k views

Changing the "Plugin Activated" Message Default

Whenever an administrator in WordPress activates a plugin, upon the reload of the plugin page, a notice will appear upon successful activation reporting "Plugin Activated". Is there a way to change ...
12
votes
4answers
3k views

Hooking in to plugins

I'm working on a plugin that would ideally be able to do things when a user does something through a different plugin. I can add custom hooks in those plugins but obviously this wouldn't work well ...
11
votes
3answers
9k views

How do I implement the WordPress Iris picker into my plugin on the front-end?

This question here is asking the same question as I am, but there were no adequate answers nor a selected correct answer so I am asking again hoping if I ask in a more coherent manner I might get a ...
11
votes
4answers
8k views

Move excerpt meta box to above content editor

I found a WordPress hook called "edit_form_after_title" to add a text box after the title. How can I use this hook to display the excerpt after the title while creating a new post?
11
votes
2answers
1k views

Hierarchical taxonomy UI

I don't like the way the taxonomies are displayed within the Wordpress admin and was wondering if anyone knew the best way to hook in and change it. Currently if I select some terms within my post ...
11
votes
3answers
4k views

Set default image link target in Gutenberg image block

I want to set the default target of the image block in Gutenberg to "Media File": I've found solutions for the classic editor, and one that appears to work for Gutenberg galleries by editing the ...
11
votes
4answers
1k views

Is there any action filter/hook for validating a custom field before publishing the post?

I have a custom filed called xxxx_url. xxxx_url should be unique. So, before publishing the post, I want to make sure that xxxx_url is unique or not? If it isn't unique, publishing the post should be ...
10
votes
3answers
13k views

How many times can I hook into the same action?

I have a theme which includes some setup, using after_setup_theme but I'd like to write my own functions which also need to run after_setup_theme. I'd prefer to keep my stuff in a separate file. Can I ...
10
votes
2answers
4k views

Action hook for custom tax edit

So, i have a function in my template file functions.php which cache a search form that contain a custom taxonomie terms. I want to flush cache (or delete one cache group) when I add/delete/edit terms ...
10
votes
2answers
9k views

How to intercept a 404 error

I'd like to intercept 404 errors and do some things before to show the 404 error page. How can intercept the 404 error?

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