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Questions tagged [filters]

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

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135
votes
7answers
61k 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?
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( &$...
58
votes
7answers
41k 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
33k 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 $...
51
votes
3answers
28k 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 ...
44
votes
3answers
67k 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!
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 ...
33
votes
10answers
66k 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? /*...
32
votes
5answers
33k 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.
29
votes
2answers
57k views

WordPress hooks/filters insert before content or after title

trying to insert content before the post content in my functions.php - I know how to use the regular wp hooks, but unsure how to insert into other areas. Tried this, but it kills content on any other ...
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. ...
28
votes
1answer
26k 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' ...
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" ...
20
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 ...
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 ...
19
votes
2answers
24k 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, ...
19
votes
5answers
34k 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 ...
18
votes
1answer
62k views

apply_filters('the_content', $content) vs do_shortcode($content)

Lets say I have a theme option or custom postmeta text area. Now I want to execute multiple shortcodes, general texts, images etc. What will be best practice and why? Option 1: $content = //my text ...
16
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 ...
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 ...
16
votes
2answers
3k 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 ...
16
votes
3answers
7k 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' ); ...
16
votes
1answer
16k views

Row actions for custom post types?

I'm working on a plugin, which converts a site into a feedback sort of portal. I made a new object page, 'Feedbacks', which displays all the feedbacks is a tabular format, and I'm using ...
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
3answers
57k views

How to reorder billing fields in WooCommerce Checkout template? [closed]

I'm creating a madlib style checkout form using WooTheme's Customizing checkout fields using actions and filters. Billing fields in the checkout template form-billing.phpare displayed with this call:...
15
votes
3answers
11k views

How can I modify the WordPress default widget output?

I don't want to style the default widget with only CSS. I want to display the default 'Categories' widget content with my own HTML structure. Is there available any filter or hook to do that?
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 ); $...
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 ...
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 ...
13
votes
3answers
27k views

remove custom post type permalink

I've registered post type with following -- $holidayLabels = array( 'name' => __( 'Holidays'), 'singular_name' => __( 'Holidays'), 'all_items' => __( 'All Holidays'), '...
13
votes
3answers
21k 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 ...
12
votes
4answers
5k views

Issues with title-tag and document_title_parts

Wordpress version 4.5.1 I'm trying to dynamically update page titles on a particular template. After lots of digging and learning about the wp_title() changes, I'm attempting to use ...
12
votes
2answers
22k views

Changing WooCommerce Display Price Based on User Role & Category [closed]

I'm looking to display a different price based on a user role (wholesaler, dealer, etc) AND based on the category. There's a dynamic pricing plugin that displays these discounts once an item is added ...
12
votes
3answers
611 views

How to show page content in feed?

I want to show the whole content of every page in feed .I search for it and found some plugin but I could not solve my problem. I want when I enter http://swissaudio.com/craftsmanship/feed it ...
12
votes
2answers
16k views

How to add sub-menu to a menu generated by wp_nav_menu by using plugin

I have a menu generated by wp_nav_menu which look like <ul class="nav-menu" id="menu-top-nav"> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-43" id="menu-...
12
votes
2answers
2k views

How to make a image-size selected by default in Media upload - WP v3.5

Bare with me. I want to have a custom image size selected by default in the Media upload popup page. In Wordpress v3.4.2 and prior, this elegant code worked fine: function ...
11
votes
1answer
2k views

what is __return_false in filters

I was thinking of removing/hiding admin-bar from my wordpress (3.1.1) installation. I visited following link: http://codex.wordpress.org/Plugin_API/Filter_Reference/show_admin_bar I was surprised ...
11
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,...
11
votes
1answer
18k 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 ...
11
votes
3answers
18k views

How to Pass External Variables to Filters/Actions

I find myself needing to pass custom data to a filter provided by a 3rd party plugin. All of the ways I've seen to do this are really complicated and hard to wrap my head around. Take this example: $...
11
votes
2answers
918 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 ...
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 ...
10
votes
3answers
7k 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/...
10
votes
3answers
23k views

apply_filters() and the_excerpt are giving unexpected results

I feel like I must be missing something pretty obvious, here, but I can't seem to get WordPress to cooperate. I'm generating Facebook OG tags with a function. Everything works fine, except for the ...
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 ...
10
votes
3answers
18k views

Filter by one custom field, order by another?

I have a custom post type "Listing" and I want to get all Listings that have a custom field gateway_value != 'Yes', and order the results by another custom field, location_level1_value. I can get the ...
10
votes
2answers
7k views

Use REGEXP in WP_Query meta_query key

I know I can use REGEXP in WP_Query like this: $query = new WP_Query(array( 'posts_per_page' => -1, 'post_status' => 'publish', 'meta_query' => array( array( '...
10
votes
1answer
2k views

Media library - Limit images to custom post type

Is there some wordpress magic/plugin that will make the media library only show images that were uploaded to a specific custom post type? I have a custom post type called "artists", I want, when admin ...
10
votes
4answers
251 views

Is there any action filter/hook for validating a custom field before publishing the post?

I have a custom filed called xxxx_url. xxxx_url should be unique. So, before publishing the post, I want to make sure that xxxx_url is unique or not? If it isn't unique, publishing the post should be ...
10
votes
1answer
523 views

Gutenberg: Is there a way to know if current block is inside InnerBlocks?

So I am using nested blocks in Wordpress Gutenberg. I am applying a wrapper on my elements that apply a bootstrap container class. Obviously I'd only want that on the outermost blocks, not on the ones ...