Method by which plugins and themes extend core WordPress functionality.

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5
votes
1answer
1k 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
4answers
5k 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 ...
5
votes
1answer
3k 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 ...
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
72 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
92 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
104 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
807 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
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 ...
4
votes
3answers
7k 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 ...
4
votes
4answers
3k 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
872 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
267 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
864 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
115 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
115 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
337 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
1answer
4k 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
2answers
675 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
5k 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
545 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
330 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
64 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
1answer
4k 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
2answers
198 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 ...
3
votes
2answers
5k 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, ...
3
votes
5answers
7k 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
322 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
1answer
5k 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 ...
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
3answers
2k 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
139 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
2answers
141 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
1answer
101 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
1k 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
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 ...
3
votes
1answer
4k 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
5k views

Add subtitle to Woocommerce product title

I'm using WooCommerce on a site built with Pagelines Framework. I need to have a subtitle/customisable field appear under the product name anywhere it appears in the site. As it is, WooCommerce ...
3
votes
1answer
444 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 ...
3
votes
1answer
430 views

Is there an action for when permalinks are rebuilt?

In my plugin, I have a list of titles and permalinks in the options table. It's updated every time my custom post type is saved. Since I'm saving permalinks the option data can become bad if the ...
3
votes
3answers
3k views

Hooking a function onto the sidebar?

I'm looking for a way to add some content to the top of the sidebar when it get's loaded. I've tried hooking onto the get_sidebar action as referenced here, but it seems to override the sidebar call ...
3
votes
1answer
54 views

How to add a link to Wordpress Plugin install Listing

When an user searches for a plugin from the WP Admin's Add Plugin area, I want to add a link/button to every plugin's listing area. Which hook should I use? The location where I want the link is ...
3
votes
2answers
210 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, ...
3
votes
2answers
267 views

Identify which loop you are hooking into; primary or secondary?

What is the most efficient way to determine which loop I'm in? I have a few plugins that alter the query by hooking into various parts of WP_Query::get_posts(), through the usual suspects, ie ...
3
votes
2answers
681 views

Seeking clarification on page request life-cycle

I'm just trying to get my head around the "life-cycle" of a typical page request in WordPress. The Action Reference page lists 38 actions that occur during a typical page load, but two things aren't ...
3
votes
1answer
282 views

Check php version before theme activation

I've got theme that requires php 5.3+ version. If older - fatal error occurs with it. So what I need to do when user try to activate this theme is to check php version before going into theme code ...
3
votes
1answer
76 views

Disallow a user to post in certain categories

I am writing a plugin that will disallow user to post in certain categories. I am trying to display an error message to the user when he tries to post in the restricted category and also want WP ...
3
votes
1answer
1k views

Hooks for trashing, deleting, saving, restoring custom post type

I need some hooks especially for trashing and untrashing custom post types. However the hooks are not so clear in this case. For example, to run a function on trash, I can use ...
3
votes
1answer
906 views

Is there a filter/action to add content to WP admin metaboxes?

I want to add an instruction into a custom term meta-box. Is there a hook to add this or is it easiest just to use JavaScript?
3
votes
1answer
29 views

Change text of Description in Image Library

i would like to change or add text to the Media Library Overlay on the right side if you click on an image and can enter a description for the image. At the moment there stands "Description" or ...