A name for an event that is executed at specific points throughout the WordPress core.

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34
votes
4answers
12k 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 ...
29
votes
3answers
12k views

remove_action or remove_filter with external classes?

In a situation where a plugin has encapsulated its methods within a class and then registered a filter or action against one of those methods, how do you remove the action or the filter if you no ...
29
votes
2answers
12k 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 ...
20
votes
1answer
10k views

How to test wp_cron?

This is kind of a stupid question... I scheduled a action to run every hour: if(!wp_next_scheduled('my_hourly_events')) wp_schedule_event(time(), 'hourly', 'my_hourly_events'); ...
18
votes
1answer
9k views

Why does save_post action fire when creating a new post?

I'm surprised by the fact that my function that I've tacked onto the save_post action fires when I click the "New Post" link in the Admin Dashboard. Note - this is before I've pressed Save or Update, ...
17
votes
1answer
9k 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!
17
votes
4answers
11k 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.
15
votes
2answers
8k views

How to get WordPress' hook run sequence?

What is WordPress' hooks execution sequence? I mean, I want to know the order, how add_action hooks are executed, i.e. init wp_head wp_footer after_theme_setup and etc.. I want to know the ...
15
votes
3answers
10k 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()){ ...
14
votes
6answers
17k views

add_action reference a class

Is it possible to reference a class instead of a function in 'add_action'? Can't seem to figure it out. Here is just a basic example of the function in question. add_action( 'admin_init', 'MyClass' ...
14
votes
1answer
899 views

How to create an API for my plugin?

I have been developing plugins for WordPress, most plugins I have developed use two or three classes, hence not as huge as Buddypress or WooCommerce. I am planning to develop two open source plugins ...
12
votes
2answers
12k 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 ...
12
votes
3answers
2k 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 ...
12
votes
1answer
517 views

Is there a action hook for the “Empty Trash” button?

I would like to run a function when the user clicks the "Empty Trash" button for posts. Something like: add_action('empty_trash','myFunction'); function myFunction(){ // My code }
11
votes
5answers
4k views

after_setup_theme always runs

I am setting up a child theme for some of my faculty members, and as a part of the theme, I would like a handful of plugins to be activated at the time that the theme is activated. So, naturally, I ...
11
votes
1answer
5k 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' ...
11
votes
2answers
5k 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 ...
10
votes
1answer
951 views

Using jQuery to delete data stored in wp_options

I wonder if anyone could advise me further on my problem. Part of my plugin stores log files for debugging purposes. I have successfully displayed them in a (div#log) in my admin page using jquery ...
9
votes
8answers
3k views

Remove an action from an external Class

I'm trying to do something similar to this question here: remove_action or remove_filter with external classes? I'm trying to remove the <!-- This site is optimized with the Yoast WordPress ...
9
votes
2answers
10k 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 ...
9
votes
1answer
3k views

add_role() run only once?

I was surprised to discover that add_role() modifies the database and fails if the role already exists. There are two implications here, one first more serious than the other: 1) if you're in ...
8
votes
1answer
7k views

How to override existing plugin action with new action

I'm using a plugin. It has an action like this. add_action('publish_post', 'old_action'); function old_action($pid) { "code goes here" } } I'm writing a module for this plugin. So i need to ...
8
votes
1answer
6k views

What is the very earliest action hook you can call?

After the solution to this question was to get a function to launch BEFORE the init action is fired by taking the sequence out of its function, it got me thinking, is there any earlier in the WP load ...
7
votes
2answers
10k 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, ...
7
votes
3answers
2k views

remove_action on after_setup_theme not working from child theme

I am trying to remove a theme action for an elegant-themes theme using a child theme.. This works when I remove action after add_action code anywhere in the parent theme functions.php. However, it ...
7
votes
2answers
3k views

add_action(), add_filter() before or after function

When looking through WordPress snippets/tutorials/plugins I often see add_action() and add_filter() being placed before the function is declared: add_action( 'publish_post', 'email_friends' ); ...
7
votes
2answers
789 views

Remove Actions/Filters added via Anonymous Functions

That's a freaking bad practice I must say. Spent last two hours finding a solution to remove actions and filters added via Anonymous functions. This is the code used on a Parent Theme, and I need ...
7
votes
2answers
3k views

Return $post_id when DOING_AUTOSAVE?

I see the following pattern over and over, on this site and on other places: add_action( 'save_post', 'wpse14169_save_post' ); function wpse14169_save_post( $post_id ) { if ( defined( ...
7
votes
2answers
398 views

How to validate XML-RPC post creation and cancel when needed?

I have an IFTTT recipe that creates posts for me on some occasion, but for some weird reason it creates three, sometimes four posts of the same content. I would like to add an add_action ...
6
votes
3answers
5k 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 ...
6
votes
2answers
16k views

When to use add_action('init') vs add_action('wp_enqueue_scripts')

In my theme's functions.php, I'm calling an add_action in order to gain a measure of control on where jquery is loaded (in the footer along with my theme's other scripts). The problem I'm having is ...
6
votes
3answers
2k views

Conditional wp_enqueue_script on a page

For efficiency we are trying to hook some JS scripts only a certain page template of a theme that is to hold a form: page-with-form.php On the theme functions.php we've defined a init_method as ...
6
votes
1answer
949 views

Difference between do_action_ref_array() and do_action()

I am having trouble wrapping my head around these two functions. I understand do_action() but I don't see clearly when do_action_ref_array() would be useful. Couldn't we pass an array to do_action() ...
6
votes
2answers
154 views

Valid characters for actions, hooks and filters

I haven't ever seen a tag such as do_action('something_10'). Is it invalid if I use numbers? If the method is valid, how can I write different numbers in the tag string conditionally? For example, is ...
6
votes
2answers
3k views

Earliest hook to reliably get $post/$posts

What's the earliest possible action I can hook into where I'll be able to access the global $post/$posts variables on both the front and back ends? I've tried looking through the Codex reference, Adam ...
6
votes
2answers
4k views

Advanced Custom Fields and Yoast SEO keyword analysis [closed]

The problem I'm having is the keyword page analysis tool doesn't read my custom fields so I am trying to figure out how to run a filter on them. I found a blog post on Yoast website here here which ...
6
votes
1answer
110 views

Can my “add_action” function know the name of the hook calling it?

Lots of hooks: add_action('thesis_hook_after_comment', 'pj_time'); add_action('thesis_hook_after_comments', 'pj_time'); add_action('thesis_hook_after_comment_box', 'pj_time'); ...
6
votes
1answer
253 views

wp_headers vs send_headers. When to use each?

I've seen wp_headers and send_headers both used before for the same thing and I'm wondering how you're suppose to know which one to use and when... On the send_headers codex page there's an example ...
6
votes
1answer
111 views

Does the event 'wp_version_check' even exist? What is it doing?

In version 4.1 of /wp-includes/update.php around line 674, there's this line: add_action('wp_version_check', 'wp_version_check'); I searched through all the wordpress core files for a ...
6
votes
2answers
1k views

Extract image from content and set it as the featured image

The problem: I'm posting from the Wordpress iPhone app. When adding an image, the image shows up in the description itself, which I don't like. What I'm trying to do: Remove the image from the ...
5
votes
1answer
6k 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).
5
votes
5answers
847 views

Implementing advanced add_* function wrappers

add_action() and add_filter() are major functions. However in some scenarios add one more function and hook it somewhere approach gets bulky and inconvenient. I had determined for myself several use ...
5
votes
1answer
2k views

Create posts on user registration

How can I create let say 3 posts after the user finish the registration ? The ideal outcome would be to create 3 posts using the user as the author of the posts and with some pre-defined values. ...
5
votes
1answer
1k views

Difference between do_action('admin_enqueue_scripts', $hook_suffix) and do_action(“admin_print_styles-$hook_suffix”) syntax

Source ref: do_action('admin_enqueue_scripts', $hook_suffix); do_action("admin_print_styles-$hook_suffix"); Laying aside the obvious difference in base action ( admin_enqueue_scripts vs ...
5
votes
1answer
7k 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', ...
5
votes
2answers
5k views

Function to execute when a post is moved to trash .

Hi is there an action which can be performed while a post is moved to trash .... I tried delete_post and deleted_post. It works but twice for each action ( before and after the action as written in ...
5
votes
1answer
7k views

Trigger custom action when setting button pressed

This is my first wordpress plugin and I'm running a lot of trouble making it work, it almost work fine but I don't find a way to accomplish this specific thing. Basically I've my custom setting page ...
5
votes
1answer
175 views

Getting instance variable in scope of 'wp_enqueue_scripts'

I need a little help getting my head around passing instance variable to a hook. I am reading the CSS files I need in my template dynamically and storing them in a $settings object that I am keeping ...
5
votes
1answer
2k views

Action hook on Edit custom post type?

Is there an explicit action hook that will fire when (or just before) the admin Edit page renders for a custom post type? Something similar to {$new_status}_{$post->post_type}? I'm trying to find the ...
5
votes
1answer
162 views

Wordpress Multisite: Adding actions to only one site

I have Wordpress Multisite installed with WooCommerce network activated. I want to add an action to a hook in ONE of the sites that has WooCommerce installed, instead of all of them. For example, I ...