Method by which plugins and themes extend core WordPress functionality.

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5
votes
5answers
821 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
3answers
13k 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: $email_to ...
5
votes
2answers
3k 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 ...
5
votes
2answers
246 views

Using filters and actions for plugin API?

I want to integrate a public API to a plugin that I develop. The usual way other plugins integrate APIs is to define some functions that can be called by any theme or plugin. However, I think this ...
5
votes
4answers
2k views

Is there a limit to hook priority?

When I wish my filter or action hook to override all others, I will assign it a priority of 999. However, lately I have been seeing some people use extreme values for the priority, such as 20000, and ...
5
votes
2answers
160 views

Is there a hook or function I can use to display all theme files being used on a current page?

Basically I want to be able to see the names of files on the front-end - not just templates e.g. category/page templates, but the actual theme files like header.php/sidebar.php/footer.php and so on. ...
5
votes
2answers
66 views

Add custom html to last sub-menu item

I'm adding a custom menu to my wordpress theme. I need to add custom html to the final submenu item - before the primary sub-menu closes </ul> I have registered my new menu //functions.php ...
5
votes
1answer
2k views

Hook that fires when admin setting is saved

Is there any specific hook that fires when admin setting is saved. I have cached some data from admin back-end setting menu. Now i want to the delete the caching when setting saved in admin menu. ...
5
votes
3answers
2k 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?
5
votes
1answer
77 views

Do WordPress Core Filenames Work as Hooks?

This is in reference to another answer here on wordpress.stackexchange. The answerer used the filename as the hook to enqueue scripts and styles to certain pages. add_action( ...
5
votes
2answers
476 views

Is there any debug toolbar that shows whick hooks are called for the current page in Wordpress?

In Django there is a debug toolbar that shows which template files and hooks are called while rendering a page. Is there any plugin that shows which hooks are called for the current page in ...
5
votes
3answers
2k views

Changing Plugin Load Order

I'm writing a plugin, bar, which is dependent on another plugin, foo, being activated, and I need the functions from foo to be available when bar loads. Normally plugins are loaded in alphabetical ...
5
votes
1answer
140 views

switch_to_blog(): Load textdomain

I am using the WordPress multisite feature with Multilingual Press Pro to create a multilingual site with linked posts. In a network activated plugin the custom post types are registered. For ...
5
votes
1answer
152 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
2answers
2k views

How to remove the Theme Customization Button from the dashboard and themes options page?

In my Wordpress theme that I've currently been building I do not take advantage of the Wordpress Theme Customization API. As much as I would like too, I've invested far too much time into my own ...
5
votes
1answer
143 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
934 views

Is there a Wordpress core & plugins update action hook?

I would like to run several actions on a website once WP core or any of the plugins have been updated using the built-in update process. Is there a way to do it? I would prefer if I could run ...
5
votes
1answer
684 views

get_query_var() not working in pre_get_posts

I'm using the pre_get_posts hook to order the main query on all my custom post type / taxonomy pages using a custom meta value. As part of the logic, I am trying to determine which taxonomy is ...
4
votes
4answers
4k 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
1answer
5k 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).
4
votes
2answers
220 views

Adding function directly vs using hook in function.php

We can use functions like register_nav_menu() directly in function.php and it works and we can also use a function to put register_nav_menu() inside of it and attach that function using a hook like ...
4
votes
1answer
8k views

How to add a new product type on woocommerce product types? [closed]

I want to add a new custom "product type" to woocommerce plugin: Tried to duplicate one of currently exist product type files (woocommerce template structure) as a new file (file name and inside ...
4
votes
2answers
1k views

How To Determine If A Filter Is Called In A Sidebar/Widget Context?

So I have a plugin that appends or prepends an enhanced author biography to the content of a page/post/custom post type. It does this by hooking to either the_content or the_excerpt and ...
4
votes
1answer
6k 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', ...
4
votes
2answers
924 views

Custom theme hooks / filters - passing arguments

I'm getting confused trying to implement these custom theme hooks. Trying to wrap my head around that. I thought i understood this. but now after reading code for several hours; it's made it worst. ...
4
votes
1answer
438 views

Hook when category is added to post

I'm trying to do something when a category is added to post and saved. I thought that using the save_post hook would have registered when a category is added to a post, but it doesn't appear to. When ...
4
votes
2answers
988 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 ...
4
votes
1answer
179 views

is it possible to get the hook name in add_action?

given this: <?php add_action( $hook, $function_to_add, $priority, $accepted_args ); ?> Is there a way to get $hook value inside the function $function_to_add?
4
votes
1answer
116 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
6k 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 ...
4
votes
1answer
412 views

Perform action on WPMU blog deletion

Hi guys :) I know there is the wpmu_new_blog action hook which enables us to perform an action when a new WPMU blog is created. Is there something similar to this which enables us to perform an action ...
4
votes
2answers
773 views

Is there a hook to put stylesheet and/or JS inside iframes (thickbox or tinyMCE) in admin area

I'm working on my admin area theme and I wanted to make some modifications on the way the thickbox and tinyMCE looks. I could make most of the changes through adding custom stylesheets and JS to my ...
4
votes
1answer
6k views

How to create thumbnails for PDF uploads?

I'm developing a website that needs to allow users, within Gravity Forms, to submit a PDF file and have a JPG thumbnail created of the first page of the PDF that is then displayed in the created post. ...
4
votes
1answer
596 views

What is the action hook for save media-form on gallery tab?

I want to save a meta data to post parent when the media-form on gallery tab is saved( The submission button is "Save All Changes"). Which action hook can I use?
4
votes
1answer
380 views

How do I flush the rules after saving settings using the Settings API?

I'm using the Settings API to allow the user to toggle the has_archive option on some custom post types. When the user turns archives on or off, I want to flush the rewrite rules. If I had written ...
4
votes
1answer
85 views

Can I hook inside another hook?

My question is that when we hook to a certain action using the oop way for example class My_Plugin_Class { public function __construct( ) { add_action( 'admin_init', array( &$this, ...
3
votes
3answers
2k 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 ...
3
votes
5answers
8k views

Adding onload to body

I'm currently trying to develop a plugin that will embed a Google Earth Tour into a WP post / page via a shortcode. The issue I am running into is that for the tour to load, I have to add an ...
3
votes
3answers
688 views

Filter for “get_post_type_archive_link()”

I tried to find filters or a hook to modify link returned by this function get_post_type_archive_link() I have gone through most of the documentation. I'm not sure it's not there or I'm not able to ...
3
votes
3answers
3k views

How to hook wp_list_pages?

How can I hook the wp_list_pages function so that it reads a value of a custom field and displays it instead of displaying the page title?
3
votes
1answer
254 views

the_content and wp_link_pages

Many plugins seem to be adding a filter/action hook to the_content to display related posts, advertisements and such. The problem is I these appear before the post pagination so it the pagination is ...
3
votes
1answer
3k views

why doesnt is_home() work in functions.php

I'm pulling in scripts.php through functions.php. this is in scripts.php but for some reason, wordpress isn't recognizing is_home(). i've tried resetting the query, but to no avail. Am I hooking into ...
3
votes
3answers
3k views

Wordpress hook before inserting post into database

I need to do check the inserted post for certain keywords and perform some functions depending on the keywords found. is there a wordpress hook that executes "just before the post is inserted into ...
3
votes
1answer
147 views

Is it possible to save/modify a post without calling the “save_post” action hook?

There is a save_post hook that is run when you save a post. In fact, revisions and autosaves also call this hook. Even if you simply change the status from published to draft it triggers the save_post ...
3
votes
2answers
2k views

wp_mail - Remove sitename from email subject

Can some one tell me how to remove site name from email subject. As of now my email subject looks like this [sitename] - Subject goes here I want it to look like this Subject goes here I ...
3
votes
1answer
678 views

What does (10, 2) mean when used with add_filter

Please tell my what is 10, 2 in below mention code: add_filter('nav_menu_css_class', 'add_active_class', 10, 2 ); function add_active_class($classes, $item) { if($item->menu_item_parent == 0 ...
3
votes
3answers
11k views

Woocommerce Product Category Widget - hide categories that have no products in stock [closed]

I'm using WooCommerce on my Wordpress site, and have a widget in the sidebar showing all product categories. It's setup to hide empty categories, and that works well. However, it still shows ...
3
votes
1answer
5k views

How to use the_excerpt in a filter hook?

I was hoping to process the_excerpt just like one would with the_content, but no such luck. How can I pass the excerpts of a Posts Page, through my plugin? I've tried variations on this: ...
3
votes
2answers
215 views

How to hook into the CPT's title placeholder?

I want to change the default placeholder text in my Custom Post Type title field. This isn't possible while registering a new post type. The following screenshot describes it.
3
votes
3answers
372 views

Define custom Page Template without its own .php file

Is there any way of defining a Page Template from some function/filter/hook, without having any .php file containing the comment at the top of the page to declare the Template Name? For example, ...