WordPress Plugins allow easy modification, customization, and enhancement to a WordPress blog. Instead of changing the core programming of WordPress, you can add functionality with WordPress Plugins.

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7
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3answers
3k views

How do I change the author of a custom post type?

I have made a custom post type and need to be able to create posts and assign them to authors. It is easy to do this with posts as you can go to the bulk edit screen and immediately change the author. ...
7
votes
3answers
2k views

How would you require and automatically download dependent plugins?

Was wondering if there was a class or programming technique that would allow me to check for the installation and activation of a particular plugin and if said plugin were not installed, to have it ...
7
votes
2answers
701 views

How do I improve this admin query snippet to avoid generating duplicate results on non-meta searches?

I've been playing around with code snippets which add meta data to admin searches. The best snippet I've found was written by Stefano on this question. However, it appears to have 1, annoying bug ...
7
votes
4answers
3k views

Update plugin from personal API

I'm developing a wordpress plugin at the moment which I do not want in the Wordpress plugin repository. However I still want to be able to push updates to my costumers from my own API repository. ...
7
votes
2answers
2k views

What should I use instead of WP_CONTENT_DIR and WP_PLUGIN_DIR?

The WordPress documentation for Determining Plugin and Content Directories states that: WordPress makes use of the following constants when determining the path to the content and plugin ...
7
votes
2answers
2k views

Is wp-content/install.php a Drop-in?

I cannot find documentation or discussions on what is and how to use Drop-in plugins. The question was raised in this Q&A, Populate content on install. Is a wp-content/install.php file that ...
7
votes
4answers
5k views

Where, When, & How to Properly Flush Rewrite Rules Within the Scope of a Plugin?

I am having a bit of a strange issue with rewrite rules not flushing properly. I have tried using flush_rewrite_rules(); and flush_rewrite_rules(true);. I have also tried globalizing $wp_rewrite ...
7
votes
2answers
4k views

Creating a Custom Post Type as a Plugin? Why?

I've been experimenting with creating a Custom Post Type as a plugin (because I've seen this recommended in various places). But I have a question not about the how, but rather the why of building ...
7
votes
1answer
1k views

Change admin language based on user (in single-site)

I'm trying to make a small plugin to install in some sites of a german client. I can make my way around WordPress in german, but would be easier if it was in english. There's a plugin that manages ...
7
votes
1answer
182 views

WordPress 4.5 deprecated get_currentuserinfo()

As of about 10 days ago, WordPress 4.5 developers deprecated get_currentuserinfo() as a pluggable function. Unfortunately my plugin uses it's own get_currentuserinfo() to login users from an external ...
7
votes
2answers
2k views

Get a path to a different plug-in

To get a the path to a plugin you can use plugin_dir_path(__FILE__) - but this obviously has to be called from within the plug-in. How can you reliably get the path to plugin B (pluginb/pluginb.php) ...
7
votes
2answers
3k views

Add screen options to custom admin pages

I want to add screen options to my plugin settings page, like the ones that are available in the Dashboard. I tried using the add_option method of the WP_Screen object and found that it supports ...
7
votes
3answers
288 views

Getting a peer review for my new plugin?

What is the best way to get an experienced WordPress developer take a look at my plugin and give constructive criticisms? I have written code to solve some of my questions on this site, and I think ...
7
votes
1answer
828 views

Adding more options to the instance of an image. (Attachment Display Settings)

I'm trying to build a simple reusable plugin for image presentation in Wordpress 3.9, and it seems I've hit a brick wall. I would like to be able to add a couple of options to the instance of the ...
7
votes
1answer
154 views

Is there a limit on making calls to WordPress.org API's?

I am writing a plugin which makes calls to https://api.wordpress.org/plugins/info/1.0/{slug}.json Is there a limit on making calls to WordPress.org API's? For example once per hour or every 10 ...
6
votes
17answers
418 views

The Great Plugin Nomenclature Contest of 2011

It's been a while since I've done a bounty challenge, so here's another. Same basic rules: 1 answer per person, most creative/useful/helpful/entertaining answer wins. This time around, the award will ...
6
votes
4answers
17k views

How can you check if you are in a particular page in the WP Admin section? For example how can I check if I am in the Users > Your Profile page?

I'm building a plugin and I want to add bits of javascript in the admin head but only for certain admin pages. I don't mean pages as in a WordPress page that you create yourself but rather existing ...
6
votes
4answers
23k views

Get page content using slug

I'm trying to get page content when I only know the slug string. Is there a function for this, or an easy way to do this or is this a case of doing it via SQL? Thanks very much
6
votes
2answers
8k views

How to change a user's password programatically

I am trying to create a totally different profile page (not the one provided by Wordpress), since the layout and feel of the default profile page is too "Wordpress" for the users. Now I am successful ...
6
votes
3answers
5k 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 ...
6
votes
3answers
3k views

PHP error with shortcode handler from a class

Currently i am using the following generic flow for adding the shortcode for a plugin. class MyPlugin { private $myvar; function baztag_func() { print $this->myvar; ...
6
votes
2answers
3k views

On the WordPress Admin section how do I link to submenu pages created for a plugin?

So i'm trying to create a WordPress plugin and I've created some menu pages using this provided function: add_submenu_page('my_plugin_menu', 'Edit record page', 'Edit record page', 'manage_options', ...
6
votes
7answers
5k views

WordPress Plug-in Development In MVC Architecture, How?

I think, the wordpress plug-in architecture is not MVC. So I want to use/do the MVC architecture in WordPress plug-in development (like cakephp, codeIgniter ). How can I use them in plguin ...
6
votes
1answer
2k views

Why does WordPress add 0 (zero) to an Ajax response?

Unless I end Ajax processing function by exit() or die(), the Ajax function receives desired and correct output but following by 0. Any idea why is that happening? Is that meant to be like that or ...
6
votes
3answers
564 views

Is it a good idea to edit an already existing plugin to add more functionality?

I need to add a relatively small bit of functionality to a Wordpress plugin and I have the option to either edit the plugin directly, or scrap the plugin completely and repurpose PHP code from another ...
6
votes
2answers
5k views

How Do I Use jQuery UI In My Plugin

It's a sad day in the world when I Google something and it returns nothing. I am trying to use the default datepicker (or ANY datepicker at this point) and am unable to because of my lack of ...
6
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2answers
2k views

Default table collation on plugin activation?

I'm following this to make my plugin auto-create a table when the plugin is activated, but what happens is that while all the tables (the whole db) are utf8_general_ci, the newly created table is ...
6
votes
2answers
3k views

How to make a plugin require another plugin?

I'm building a plugin that adds extra functionality to a main plugin. Ideally in the plugins administration screen, the "activate" link should be disabled and an inline note should be added that tells ...
6
votes
3answers
7k views

Getting Path To Uploaded Attachment Image After Upload

After you have uploaded an attachment in Wordpress using the media upload screen, is there a hook or filter I can run after the image has been uploaded where I can get the path to the uploaded image ...
6
votes
3answers
826 views

Is there a way for a plug-in to get it's own version number?

Is there an API I can call, inside my plug-in, to determine the plug-in's version? I just want to have my plug-in emit a html comment with it's own version number ... for diagnostic purposes.
6
votes
1answer
407 views

Optimize shortcode callbacks

I created a plugin to add some shortcodes in my WordPress site. But I'm a PHP newbie, so I believe it may have some errors or ways to optimize it. It's working fine, and apparently there are no ...
6
votes
2answers
2k views

How to provide translations for a WordPress TinyMCE plugin?

I know that I can get my translations into JavaScript doing: $MyTranslations = array( 'translation1' => __("Some String 1", "MyTranslations"), 'translation2' => __("Some ...
6
votes
3answers
417 views

Releasing new plugin version, how to rename old options keys?

I have everything ready for publishing a new version of my plugin but one last issue stands... The old version had no naming convention for its key option names. The options grew and I renamed all ...
6
votes
3answers
2k views

How should one implement add_settings_error on custom menu pages?

The Professional WordPress Plugin Development book explains in detail how to properly use the Settings API, and it also demonstrates how to add Menus and Submenus, but unfortunately it doesn't provide ...
6
votes
4answers
5k views

Passing arguments to a admin menu page callback?

Situation: I'm working on a plugin and I'm developing it as a class, everything worked fine until I run into this situation. I wanted to make things a bit cleaner and tried this.. class MyPlugin { ...
6
votes
3answers
2k views

Using Docker for WordPress development

I am getting started with Docker and I'm still new to professional WordPress development practices. I would like to set up a Docker development environment (on my Mac) so that I can do custom ...
6
votes
1answer
648 views

Uninstall script for a plugin in Multisite

I've just realized that the traditional uninstall.php file along a plugin is not working in Multisite. if ( !defined( 'WP_UNINSTALL_PLUGIN' ) ) exit(); delete_option( 'plugin_option_name' ); ...
6
votes
2answers
3k views

Get List of Registered Meta Boxes and Removing Them

Is there a function for getting a list of registered Meta Boxes and removing them? I see there is a method for adding, and removing. http://codex.wordpress.org/Function_Reference/remove_meta_box ...
6
votes
1answer
3k views

Using a plugin class inside a template

I am writing a plugin to send an invitation to a friend which opens up a form when a link is clicked. I encapsulated all the functions in class by following the code given in the Report Broken Video ...
6
votes
1answer
203 views

How to write testable classes in Wordpress

I'm currently doing some modifications on the Wordpress plugin that I created in order to make it testable. The problem is I don't know which methods am I suppose to write tests for. I have methods ...
6
votes
1answer
158 views

API to trigger prompt on leaving page

I have a proprietary plugin that creates a metabox on the edit-post page. When the data managed by the plugin is edited and the user navigates away then we would like the user to be prompted as ...
6
votes
1answer
886 views

What is the difference between esc_html and wp_filter_nohtml_kses?

What is the exact difference between esc_html and wp_filter_nohtml_kses. Everywhere I look says that both strip all the html, the only difference I can see is to do with exactly how they do this. Does ...
6
votes
1answer
141 views

Rewriting every url

I have a question regarding permalinks and rewriting url's. I am writing a translation plugin and I would like to add the language shortcode in my url (Something like ...
6
votes
3answers
1k views

How can I make it so the Add New Post page has Visibility set to Private by default?

I'm trying to create a plugin that alters the Add New Post page so the Visibility field says "Private" by default: Status: Draft Visibility: **Private** Publish immediately [Publish] ...as opposed ...
6
votes
3answers
954 views

Replace audio/video enclosure with player?

Current state: I'm parsing XML feeds into the front end and/or the back end (Admin UI), but not into the DB. Inside those feeds i place mp3- and video content, currently only as plain text (no link, ...
6
votes
1answer
1k views

Mini-Site Strategy

I'm working on a project to allow a number of mini-sites within a WordPress multisite installation. Here's how it's supposed to function: The client has a large number of individual locations, each ...
5
votes
2answers
1k views

Custom pages with plugin

I'm developing some plugin where I would like to enable custom pages. In my case some custom page would contain a form like contact form (not literally). When user will fill out this form and send it, ...
5
votes
3answers
8k 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 ...
5
votes
3answers
987 views

How do I log plugin (cron) actions?

Is there a recommended way to log (failed) cron actions from your plugin? For example, I have a plugin that synchronizes with an external service every hour. I want to log how much was changed, but ...
5
votes
1answer
2k views

How can I add columns to the post edit listing to show my custom post data?

When you click on "Posts" or "Pages", you get a paged listing of your posts or pages with the following columns: Title | Author | Categories | Tags | Date I have a plugin which gives an SEO score ...