Questions tagged [filters]

A type of hook that provides a way for content to be overridden programatically

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7
votes
2answers
1k views

Clarification on filters and hooks

I am about to start my first WordPress project and I have the task of moving customized core code that override the core into separate functions/files (this way it'll be easier to maintain when we ...
61
votes
3answers
9k views

How to remove a filter that is an anonymous object?

In my functions.php file I would like to remove the below filter, but I'm not sure how to do it since it's in a class. What should remove_filter() look like? add_filter('comments_array',array( &$...
57
votes
7answers
39k 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 ...
52
votes
8answers
32k 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 $...
28
votes
1answer
32k views

How to add defer=“defer” tag in plugin javascripts?

I couldn't add defer tag in plugin javascripts. Google developer pagespeed test suggests me to add defer tag in contact form 7 javascripts. This is how contact form 7 includes javascript in header. ...
51
votes
3answers
27k 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 ...
43
votes
3answers
65k views

Add filter menu to admin list of posts (of custom type) to filter posts by custom field values

This answer is very close to what I am looking to do, but instead I would like to specify a specific custom field and display a select menu of its available values. Thanks!
20
votes
1answer
2k 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 ...
134
votes
7answers
60k views

Disable emojicons introduced with WP 4.2

So WP 4.2 introduced emojis (smileys) that basically adds JS and other junk all over your pages. Something some people may find shocking. How does one completely erase all instances of this?
15
votes
1answer
10k views

Saving Taxonomy Terms

I have an interesting problem which I hope someone can quickly answer. I have created my own metabox which, based on "MY METABOX CODE" (list below) is correctly displaying a dropdown list of all my ...
9
votes
3answers
6k views

Filter any HTTP request URI?

I want to filter any HTTP request URI done through the HTTP API. Use cases: The WordPress update check goes to http://api.wordpress.org/core/version-check/1.6/, but https://api.wordpress.org/core/...
35
votes
4answers
26k views

Filter to remove image dimension attributes?

I'm working on a site based on a fluid width css template which sets a max-width on images to the width of the column containing them, and I need to remove the inline width and height dimension ...
19
votes
6answers
12k views

single-{$post_type}-{slug}.php for custom post types

My favorite part of the Wordpress template hierarchy is the ability to quickly create template files for pages by slug, without having to edit the page in Wordpress to select a template. We can ...
8
votes
1answer
5k views

Set JPEG compression for specific custom image sizes

I use various custom image sizes (by add_image_size) and I have set my JPEG compression to 30% with this filter: function jpeg_quality_callback($arg) { return (int)30; } add_filter('jpeg_quality', ...
21
votes
2answers
3k views

How do filters and hooks really work in PHP

How does filters and hooks actually work in WordPress? I'm asking about something advanced. How is it implemented in PHP? E.g how does it collect all the hooks from the different plugins and "attach" ...
19
votes
5answers
33k views

How can I edit post data before it is saved?

I have a plugin and I would like to be able to run the post content through some filters before it is saved to the database. From looking at the plugin api, I see that two hooks that look like they ...
10
votes
2answers
904 views

current_shortcode() - detect currently used shortcode

In a plugin class I want to provide simple fields for public data: email, phone number, Twitter etc. The list can be extended. See the plugin Public Contact Data on GitHub for details. To keep the ...
11
votes
1answer
17k views

Where is the best place to use add_filter

Should I use the function add_filter In my plugin's init action hook or just the in the main plugin script? Since sometimes I found people is using filter all over the place and if I put in the init ...
14
votes
3answers
2k views

the_content and is_main_query

I am filtering the content with the the_content filter. Everything works perfect, excerpt that my changes are applied to custom queries as well. My changes appear in the sidebar as well if the widget ...
5
votes
1answer
3k views

Sort search results by post type

I need to sort my search results by custom post type. the problem: the order is custom. I do have 5 different post types and i got the order like so: artist artwork page post publication I'd like ...
1
vote
1answer
717 views

Exclude custom function content from certain pages

I have added a small custom function to display a little author bio blurb at the bottom of each blog entry in my functions.php file inside the current theme that I am using. So far so good, it is ...
7
votes
1answer
5k views

Add custom class to core blocks in Gutenberg

I'm trying to add a class to list blocks (core/list) in Gutenberg. Unfortunately, it looks like because some blocks like lists and paragraphs don't have the standard default class name of wp-block-{...
28
votes
1answer
25k 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' ...
2
votes
6answers
6k views

Make parent categories not selectable

I'd like that my categories having child-categories don't be selectable on the post article page. What I want to do is to remove the checkbox before their label. I've looked the filter documentation ...
5
votes
2answers
6k views

add_filter and changing output captions of image gallery

I'd like to change only one output of native WP Gallery (in media.php) On Smashing Magazine (link) author advises to change whole gallery_shortcode function. But I wondered if is possible to change ...
1
vote
2answers
2k views

Override parent theme function that is not hooked or in the functions.php file

I need to remove a function from the parent theme and replace it within the child theme. The function is called print_meta($meta_box). The function is not pluggable and it located in a random file, ...
32
votes
5answers
32k 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.
10
votes
2answers
12k views

WP Rest API: details of latest post including featured media url in one request?

I'm using wp-rest api to get posts information. I also use wp rest api filter items to filter fields and summarize the result: When I call http://example.com/wp-json/wp/v2/posts?items=id,title,...
8
votes
2answers
2k views

WordPress 3.9 - Trouble Editing new TinyMCE

With WordPress 3.9 coming soon it's bringing along TinyMCE 4.0. I'm running my plugins and functions through some testing and found that one of my functions seems broken / not working with the new ...
16
votes
2answers
2k views

How do I exclude plugins from getting automatically updated?

There is an opt-in filter that allows all plugins on my site to receive automatic updates: add_filter( 'auto_update_plugin', '__return_true' ); I like this feature, but I don't want all my plugins ...
10
votes
3answers
16k views

Filter by custom field in custom post type on admin page

I've used Advanced Custom Fields to create custom fields for Competition name, answers etc. I've made a custom post type for competitions as shown on the image and I used Wordpress functions.php to ...
9
votes
1answer
7k views

Query WP REST API v2 by multiple meta keys

Using v2 of the REST API, I'm wanting to query some posts by multiple meta keys. With v1 I was able to format the url like &filter[meta_value][month]=12&[meta_value][year]=2015 and it worked (...
16
votes
2answers
21k views

Dynamically exclude menu items from wp_nav_menu

I tried looking for info about how to exclude/remove nav menu items from custom menus, and the only thread I found did not have any answers that were useful to me. 1. Background: I put together a ...
10
votes
3answers
3k 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 ...
8
votes
2answers
4k views

Update post counts (published, draft, unattached) in admin interface

I am working on a multi-user WordPress setup and have made it so a particular type of user can only see and interact with posts, images, pages etc that they have authored. The code to make this happen ...
7
votes
5answers
16k views

How can I remove the “Add New” button in my custom post type?

I have many custom post types that need the Add [custom post type] feature but I have a custom post type of "About" and I do not need to "Add New" about to the about custom post type. So I want to ...
1
vote
1answer
425 views

What's the difference between hooks, filters and actions? [duplicate]

It seems like the terms hooks, filters and actions are used interchangeably. What's the difference between them? What do they do? How do I use them?
6
votes
2answers
18k views

remove_filter( 'the_content', 'wpautop' ); only for certain post types

I want to try and remove automatic <p> tag and <br> tag addition for my custom post type. It looks like remove_filter( 'the_content', 'wpautop' ); will do this, but how would I make the ...
5
votes
2answers
16k views

How to order posts of a custom post type by date DESC in dashboard Admin?

I created a new post type named "Video". When I create post for the post type, posts is ordered by title ASC. Is it possible to order posts by date DESC please ? register_post_type('Videos', array(...
1
vote
1answer
2k views

Title_save_pre - Simple problem that u know for sure

I have two custom post type. Then I need to use title_save_pre to post title prior to saving it in the database. I need to use this filter just for one custom post type. This is my function: <?...
3
votes
1answer
6k views

Changing Posts Per Page and offset with pre_get_posts

I have a filter using pre_get_posts to change the number of posts per page from 4 on the news landing page to 8 on all other pages (page 2, 3, etc). However I don't seem to have got the offset correct,...
15
votes
2answers
19k views

Explanation for apply_filters function and its variables

I'm learning how to build html forms using PHP by taking an example from "simplr form registration" plugin. I'm looking at this code: $form .= apply_filters('simplr-reg-instructions', __('Please ...
33
votes
10answers
65k views

remove empty paragraphs from the_content?

Hey guys, I simply want to prevent the creation of empty paragraphs in my wordpress post. That happens quite often when trying to manually space content. I don't know why this doesn't take effect? /*...
15
votes
8answers
22k views

Remove classes from body_class

I don't need this whole mess of classes like this... <body class="page page-id-829 page-template page-template-page-template-portfolio-php portfolio"> I'd like something like this... <body ...
15
votes
2answers
3k views

Add custom options to the wplink dialog

I managed to add a custom option-select for images with function attachment_field_credit( $form_fields, $post ) { $field_value = get_post_meta( $post->ID, 'first_image', true ); $...
5
votes
5answers
977 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 ...
3
votes
3answers
22k views

Remove title attribute from images

I'm looking for a way to remove the title attribute from images, preferably through using a hook or a filter. Most clients don't bother giving images a proper title, thus eliminating the purpose of ...
3
votes
1answer
7k views

Rename image uploads with width in filename

I am attempting to change the name format that WordPress uses to rename uploaded files. For example, when I upload an image with filename cat-picture.jpg WordPress will create scaled versions and ...
3
votes
5answers
6k views

How to publish a post with empty title and empty content?

Why I'm doing this you might ask? I'm developing a website for a business with a portfolio where the gallery items are posts. These posts are populated through custom fields and category selections, ...
2
votes
1answer
3k views

How can I display parent and child taxonomies in separate drop downs?

The requirement is where i have a taxonomy State which is the parent and it has a child sub-taxonomies they are the Cities, Need to display the state as a drop down, when i select the particular state ...