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

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18
votes
1answer
4k 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 ...
14
votes
1answer
4k 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, ...
11
votes
2answers
5k 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 ...
11
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
5k 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'); ...
10
votes
1answer
494 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
1answer
5k 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
501 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
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 ...
9
votes
2answers
2k 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
3answers
3k 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 ...
8
votes
5answers
5k 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' ...
8
votes
3answers
5k 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()){ ...
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
2answers
136 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
3answers
1k 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 ...
6
votes
3answers
4k 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.
6
votes
2answers
5k 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 ...
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
2k 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 ...
6
votes
1answer
65 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
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
2answers
963 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
2answers
109 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 ...
5
votes
1answer
890 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
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 ...
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
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 ...
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
5answers
638 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 ...
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
3k 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 ...
4
votes
3answers
4k 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
3answers
143 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
8k 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
1answer
105 views

How Do I Load My Action Earlier Enough?

With add_action, I want to intercept as early as I can in my plugin and send a 304 Not Modified header per some rules. Does anyone know what the order is of events? When I view this page, it seems to ...
4
votes
1answer
212 views

Why, Where, and When to use reference pointers in filters/hooks?

Why, Where, and When to use reference pointers in filters/hooks? What are the potential cons of not using them when suggested or required? Just looking for a more detailed answer than the codex ...
4
votes
1answer
911 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 ...
4
votes
1answer
92 views

Getting the action's tag name within the action

There's a function attached to a set of actions, like this: add_action('some_tag', 'the_function'); function the_function($maybe_some_vars){ // ... } Is it possible to find out the action name ...
4
votes
1answer
677 views

How to change “Draft” string for status of custom post type to “Unavailable”?

ANSWER MOD: just an important mod to the chosen answer: // check if you actually have drafts; also avoids extra '|' separator if (isset($views['draft'])) { // 'Drafts' should be added (and come ...
4
votes
1answer
158 views

Store source permalink on XMLRPC calls

In a theme I'm developing, I need to link to the source post when the post has been stored using XMLRPC. That implies that every time Wordpress asks for a permalink (using get_permalink()) the theme ...
3
votes
1answer
3k 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).
3
votes
1answer
894 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. ...
3
votes
3answers
2k views

How to correctly get post type in a the_title filter

I want to prepend text to the post titles of a specific custom post type, but the filter below didn't work. Instead of changing only that CPT's post titles, it changed all titles on the given CPT's ...
3
votes
1answer
158 views

Which action for triggering cron “wp”or “init”?

Which one do you recommend using within a plugin and why? add_action( 'wp', 'trigger_me' ); function trigger_me() { if ( !wp_next_scheduled( 'my_plugin_cron' ) ) { ...
3
votes
3answers
694 views

How can I remove the WP menu from the admin bar?

I never use the WP menu (the logo and its child items) except when I click it accidentally. And it is wasting my time when I navigate per keyboard. Plus, the support page is not our site. How can I ...
3
votes
2answers
730 views

Correct place to register and enqueue scripts

I'm queueing several scripts in my themes Functions.php: if ( ! function_exists('b99_init_scripts') ) : function b99_init_scripts(){ if ( !is_admin()){ ...
3
votes
2answers
88 views

How to count number of functions attached to an action hook?

I have some actions like this function simple_notification() { echo '<div>This is a notification</div>'; } add_action( 'site_notices', 'simple_notification' ); ...
3
votes
2answers
670 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 ...
3
votes
1answer
238 views

Hook into admin post list page

So I want to create a custom admin interface for the post and page lists. I want it to be a split view with a list of posts and some data on the left, and a full editable preview of the post on the ...