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

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27
votes
2answers
7k 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 ...
23
votes
2answers
7k 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 ...
18
votes
3answers
6k 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 ...
15
votes
1answer
6k 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, ...
14
votes
1answer
7k 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'); ...
12
votes
3answers
1k 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 ...
11
votes
1answer
681 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 ...
10
votes
6answers
9k 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' ...
10
votes
3answers
6k 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()){ ...
10
votes
4answers
2k 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 ...
10
votes
1answer
6k 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!
10
votes
1answer
307 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 }
10
votes
1answer
681 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
2answers
3k 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 ...
8
votes
2answers
7k 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 ...
8
votes
1answer
4k 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 ...
7
votes
3answers
6k 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.
7
votes
1answer
3k 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 ...
7
votes
2answers
411 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
2k 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
4answers
2k 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 ...
7
votes
1answer
2k 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 ...
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
2answers
126 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
2k 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
1answer
78 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
1k 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' ...
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
3answers
1k views

How to get WordPress' hooks 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 after_theme_setup wp_header and etc.. I want to know the correct ...
5
votes
3answers
4k 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 ...
5
votes
5answers
758 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
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
2answers
571 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 ...
5
votes
1answer
513 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() ...
5
votes
2answers
3k 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
3k 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 ...
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
43 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 ...
5
votes
1answer
185 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 ...
5
votes
1answer
99 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 ...
5
votes
1answer
167 views

Content hooks vs User hooks

This is more of a theory question than a question with a direct answer. I've been working with different actions for firing functions when a post is updated or deleted and when users are updated or ...
4
votes
2answers
2k views

Does an activated plugin automatically mean its methods are available to other WP functions?

I made a WordPress plugin like this: Class MY_CLASS { //codes } Global $myclass; $myclass = New MY_CLASS (); After installed and activated the plugin, can I use this class in other plugins without ...
4
votes
3answers
1k views

How can I find out what functions are assigned to actions?

Is there any way to know what functions are added to actions on a certain page in WordPress?
4
votes
3answers
6k views

Perform an action when post is updated/published

I'd like to run a custom query using some meta data whenever a post is updated or published. Is there something I can put in functions.php to fire when those events occur?
4
votes
2answers
10k 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 ...
4
votes
4answers
2k views

Unregister post type from child theme

I'm trying to unregister a post type from a child theme but I haven't been able to do so, the code in the funcions.php file on the parent theme is something like this: add_action( 'init', ...
4
votes
2answers
1k 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' ); ...
4
votes
1answer
1k 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. ...
4
votes
3answers
181 views

How to restrict actions and filters “properly” by conditions

Which one is correct when adding actions/filters/etc.... Both methods work fine and I've seen people do things both ways, but I'm assuming one is correct. My gut tells me that wrapping the if ...
4
votes
2answers
838 views

How can I log a user out of Wordpress before the page loads?

I would am using the code below so that on my wordpress site if ?logout is appended to the end of the URL the user will be logged out. This works well - if the user visits a page such as ...