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
votes
4answers
7k views

What is difference between get_bloginfo('url') and get_site_url()?

I am developing a plugin. I want to know difference between get_bloginfo('url'); and get_site_url(); I got same output, then what's the difference?
6
votes
3answers
6k 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
1answer
321 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
1k views

WP_Query leaking absurd amounts of memory

Every time I call WP_Query() in the function below, Wordpress leaks 8 megs of memory. And since I call this function a lot, things get hairy pretty quickly... :( I've tried unsetting the resulting ...
6
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. ...
6
votes
2answers
1k views

What is the correct way to build a widget using OOP

I am working on a simple search form widget, with a built in autocomplete capability (You can download the current version here). The plugin is working, but I am currently rewriting all the code using ...
6
votes
2answers
505 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 ...
6
votes
3answers
371 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
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 ...
6
votes
1answer
192 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
132 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
2answers
1k 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) ...
6
votes
1answer
745 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
133 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
1answer
2k views

Adding Widget form fields dynamically

I am trying to add form field to a WordPress widget dynamically. So if the user want to add another date to an event they can click a button to get more fields. The question is: How do save newly ...
6
votes
3answers
846 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
915 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
873 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
3answers
4k 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 ...
5
votes
3answers
815 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
932 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 ...
5
votes
3answers
16k 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
5
votes
2answers
932 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
4answers
2k 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
3answers
477 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 ...
5
votes
2answers
2k 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
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', ...
5
votes
3answers
632 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.
5
votes
3answers
2k 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. ...
5
votes
2answers
5k views

Using add_theme_support inside a plugin

I've created a custom post type as a plugin and released it into the repository. One of the core features involves using a featured image. I've added thumbnail to $supports in register_post_type(), so ...
5
votes
1answer
731 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
3answers
500 views

What's the best method for emptying an option created with the Settings API?

I'm trying to empty an option created with the Settings API and failing. update_option ( 'my_option', '' ); appears to do nothing, whereas delete_option ( 'my_option' ); destroys the whole option ...
5
votes
2answers
385 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
1answer
1k 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
2answers
2k views

Custom Post Type Plugin: Where Do I Put The Template?

I'm writing a custom post type plugin. Part of it I'm outputting to the template via shortcodes. But other parts need a custom post template, and I figured out how to use the template hierarchy for ...
5
votes
2answers
229 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
1k views

How to create a Wordpress plugin for another wordpress plugin?

I always do changes on the Wordpress plugins for clients. But these changes are always in danger to be lost if the plugin is updated. Is there is a way to make a plugin for another plugin in ...
5
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 ...
5
votes
4answers
2k 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

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
271 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
268 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
300 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
1answer
1k views

dbDelta not creating tables

I went through a lot of threads, codex page and tried messing with a lot of things but my code doesn't seem to be creating the tables. And I am not able to figure out where I am going wrong. I checked ...
5
votes
3answers
468 views

Prevent network activation of plugin

I have a plugin that currently doesn't support network activation. The best fix for this of course is to fix it :) which I plan to do. However I wonder if there is a temporary solution I can use to ...
5
votes
2answers
1k 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
512 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
281 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
1answer
1k 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 ...