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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6
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1answer
159 views

Understanding Wordpress functions' naming conventions

Many Wordpress functions follow naming conventions, probably the most well known of these would be the the_*() functions, such as the_post(), used in The Loop. Obviously the is_*() family of ...
6
votes
3answers
436 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
1answer
4k 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
3answers
3k 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
6k 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
8k views

Quick edit screen customization

Possible Duplicate: How to show custom meta box on "Quick Edit" screen? I'm trying to edit the quick edit screen on my custom post type "visitor" so that I can add some options for my end-users. My ...
6
votes
3answers
488 views

Standard location for plugin to save/cache files?

Are there official guidelines on where a plugin should cache files? If not, is there a best-practice out there that I can follow? For example, a plugin grabs content from a back-end system ...
6
votes
3answers
2k views

Query Posts by Custom Field 'Price'

I'd like to display all posts within a given price range. For example: When a user inputs 100 and 1000 (in two separate form fields) - my site will display all posts that have a custom field called ...
6
votes
1answer
721 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
4k 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
132 views

What is the etiquette on extending a plug-in

I recently played with a plugin which I liked a lot, but felt it was missing something. So as first stage I went and wrote a tiny plugin (my first), that just added the needed feature - meaning, that ...
6
votes
1answer
211 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
166 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
939 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
3answers
1k views

Widget development - Drop down options won't save

So, i successfully managed to add a drop down option, the problem is when i click save all of the options are removed, however the chosen option is implemented successfully. Here is the relevant code:...
6
votes
1answer
142 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 http://eyewebz.com/EN/...
6
votes
3answers
704 views

Plugin directory “Last Updated” not changed after initial commit?

I released the first version of my Rewrite analyzer plugin with a commit on 2010-05-12. The WordPress.org plugin directory however still displays 2010-11-27 as the "Last Updated" date - this is the ...
6
votes
3answers
961 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
8answers
7k views

is_plugin_active function doesn't exist

I'm using WordPress 3.0.5 and have tested with 3.1rc4. In the main PHP file of my plugin, when I try to call is_plugin_active I get Call to undefined function is_plugin_active(). I can call add_action ...
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 hook ...
5
votes
3answers
1k 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 ...
5
votes
2answers
1k views

Test to see if jQuery or Prototype is queued by another plugin?

In my plugin, I want to test to see if jQuery or Prototype (or both) are going to be loaded by another plugin. So, have wp_enqueue_script('jquery') or wp_enqueue_script('prototype') has already been ...
5
votes
3answers
10k views

How to call a plugin function from index.php [closed]

I have created a function in my plugin myplugin with the name foo, how to call it from the frontend? e.g. index.php?
5
votes
2answers
1k views

Where can I find a schema of wordpress plugin core architecture?

There are plenty of articles which explain how to create a wordpress plugin. I'm not looking for that, I'm looking for a schema of the core architecture of a wordpress plugin (an UML class diagram and ...
5
votes
4answers
3k views

How to create and link to administration page for a plugin?

OK Full Code: <?php //check to see whether the user is an admin or not. if (is_admin()) { function wpsc_display_products_seo(){ global $wpdb; $productList = $wpdb->get_results("SELECT * FROM ...
5
votes
2answers
285 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
1answer
2k views

Load js/css files only on specific admin UI pages

How do I adapt this solution to work with my plugin? (Please see the link). I enqueue my css and js script as follows: function my_plugin_init() { wp_enqueue_script('my_plugin_script', plugins_url('...
5
votes
3answers
22k views

How to include wp-load.php from any location?

I have a plugin which calls a stand-alone php script (myAjax.php) via a jQuery.ajax() script inside the plugin. I need to place the following code into the myAjax.php file: require_once('../../../wp-...
5
votes
1answer
491 views

Nonces can be reused multiple times? Bug / Security issue?

I've read that nonces are meant to be for one time use only, and after an ajax request, you should issue a new nonce so with the next ajax request, a new nonce would be sent to the server. However, I ...
5
votes
2answers
3k views

How to implement bulk actions in my plugin?

I am developing a WordPress plugin. This plugin displays a list of courses. Now I want to implement the bulk actions just like in other plugins. From where I can apply the delete and edit actions to ...
5
votes
2answers
3k views

How do I create links at the top of WP_List_table?

I am trying to create links like the ones in the post tab. See Image Below. I created my WP_List_table but I am not sure how to create those links or how to get them to show a different db query. I ...
5
votes
3answers
2k views

Is there a hook for when you switch themes?

I created a plugin but I just came across a bug that I don't really know how to solve. When you activate my plugin, it creates a file in the active theme directory and when you deactivate it, it ...
5
votes
1answer
1k views

How does Wordpress handle MySQL row lock errors?

If there is a WordPress plugin which updates rows in a custom table, but that update encounters a row lock, what happens? E.g. two users simultaneously fire an update on TABLE1, one setting AGE=1 and ...
5
votes
4answers
4k views

Where to put third party PHP library?

I'm developing a couple of open-source plugins and a theme (all part of a "suite") that all use the same third party PHP library. I'm wondering what is the best way to include it in Wordpress. Here ...
5
votes
3answers
2k views

How to output message during plugin activation

I am developing a plugin, but during the activation phrase I am constantly facing bugs. However there is no easy way to display error messages, since echoing stuff would result in 'unexpacted output' ...
5
votes
1answer
4k views

Custom Filter in Wordpress to modify footer information via plugin?

Basically, I've got a plugin that searches for certain tokens in the entire page and replaces the tokens with images. The problem is, I've got one of those tokens in the footer and, as far as I can ...
5
votes
2answers
412 views

How would I create a plugin for my shortcodes?

All tutorials I have found say to add your shortcodes to functions.php in your theme. I would like to break that away from my theme and put that in a plugin so I can share these shortcodes between my ...
5
votes
2answers
312 views

What is wrong with using add_option with Multisite instead of add_blog_option in a plugin

I'm working on a new plugin but it's my first to save which will save an option to the database. Currently I'm using add_option and I assumed that - activation would fail or - the wrong value would ...
5
votes
3answers
3k 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
2answers
306 views

Should I create a theme or a plugin?

I'm working on a pro bono project to try to learn WordPress. I've been provided with a rough design (see screenshot below) and I'm struggling trying to think of how to approach the issue. My main ...
5
votes
1answer
368 views

Completely remove WP_Admin_Bar for specific user roles

How do I hide/remove the admin bar that is displayed when a user with specific role is logged in? I figured I have to do something with remove_menu(), but not exactly what and how. Codex
5
votes
1answer
522 views

Do plugin files have to follow a specific convention to be “picked up” by WordPress?

I developed a plugin using the normal convention of naming the main plugin file after the plugin folder (i.e. prefix-someplugin for the folder and prefix-someplugin.php for the file). However, I saw ...
5
votes
2answers
2k views

How-to implement admin Ajax inside an admin WP_List_Table?

I am new to WordPress if someone will help me I will be very appreciate. There is parameter ajax "true" but in docs. wasn't said how to implement Ajax using WP_List_Table Class? parent::__construct( ...
5
votes
2answers
2k views

Inserting Taxonomy Terms During a Plugin Activation?

I've been trying various ways of doing this. Basically, I've been trying to make it so that a plugin of mine populates the terms of a taxonomy only once during the plugin's activation. The term ...
5
votes
1answer
667 views

Modifying the way WP sets cookies

I'm trying to create a custom plugin that will change the way that wordpress names its cookings. Specifically, I want to write my own version of wp_user_settings(). I know I probably shouldn't hack ...
5
votes
2answers
301 views

Best practice for including plugins as part of a theme?

I'm working on a theme that includes some functionality I've developed as separate plugins (as I'm hoping to release them independently). I'd like to include these plugins as part of the theme core ...
5
votes
3answers
3k views

How can I find plugins' slug?

I'm wondering how can I find plugins' slug (slug = internal name used by WordPress to do plugin updates and to determine which plugins are currently active)? It is usually plugin's folder name but if ...
5
votes
1answer
298 views

Using a database view = evil incarnate?

I'm at a point in doing some WordPress plugin development where from what I can tell I either have to create an entirely new plugin or I can create a database view. The client wants some simple logs ...