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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9
votes
2answers
3k views

Looking for WordPress System Diagrams

I am looking for WordPress chart/diagram system design. I found only the template hierarchy diagram, but it's only part of the system. source: http://upload.wikimedia.org/wikipedia/commons/3/3d/...
9
votes
2answers
5k views

How to Remove Certain Screen Options and Meta Boxes from add/edit post type?

Now, when you add or edit a particular post within your desired post type, there are more screen options as well. Although, these Screen Options are showing/hiding meta boxes. I would like to be able ...
3
votes
3answers
6k views

What is the recommended way to create plugin administration forms?

I have seen and been using the following technique for adding php scripts to my plugin for handling custom forms in a wordpress plugin. from the quizzin plugin: $code_pages = array('quiz_form.php','...
6
votes
2answers
6k 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 ...
10
votes
3answers
4k views

Should Plugin Folders Include a Blank index.php File?

WordPress itself, in the wp-content folder, includes an empty PHP file which looks like this. <?php // Silence is golden. ?> Should plugins include an empty file like this as well to stop ...
4
votes
3answers
3k views

Creating a default Custom Post Template that a Theme can override

I'm in the midst of building a Wordpress Plugin that adds a custom post type, for which I'd like to include a default template to display. Essentially, this is an event management plugin, and the ...
12
votes
2answers
3k views

How to store username and password to API in wordpress option DB?

I'm currently developing a plugin and the chances are that I will more than likely release it on the public plugin repository so others can use it. The plugin will be using an API and to use this API ...
3
votes
1answer
6k views

template_include (overriding default plugin templates via current theme)

This is an extension of this question/answer. A comment on that question references that template_include is preferred to template_redirect when loading templates from a plug-in. However, hanging ...
5
votes
1answer
668 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 ...
2
votes
3answers
1k views

How do you store options with a:n:{{}} syntax in wp_options?

I'm checking out how a particular plugin works and noticed that it stores its data for option_value in wp_options in this array format... a:2:{i:20;a:2:{s:8:"original";s:15:"20.original.jpg";s:9:"...
1
vote
1answer
7k views

What is the difference between $post_id and get_the_ID()?

What is the difference between $post_id and get_the_ID()? I could not find any documentation on $post_id.
8
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 ...
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
2k 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
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 ...
4
votes
2answers
3k views

Is There A Hook To Process The Content Of The Text Widget?

Is there any filter which can be used in a plugin to process the content of the text widget before it is rendered?
4
votes
3answers
558 views

Handling jQuery Component Collision

In plugin development, what is the best practice to prevent jQuery component collision on the front end? For instance, let's say I include the jQuery Apprise dialog in a plugin that loads this on the ...
0
votes
5answers
3k views

Plugin Development: Wordpress processes twice on post update. How to skip process on the first?

When you create a plugin and set up a process function, Wordpress will run the plugin process function twice upon clicking the update button. I believe the first process is for the versioning (...
0
votes
1answer
687 views

Filters 'request' and 'parse_query' not firing in sites.php nor link-manager.php

I'm trying to make sortable columns in Sites and Links listings admin pages. /wp-admin/network/sites.php and /wp-admin/link-manager.php The problem is the following filters are not firing up in ...
34
votes
9answers
11k views

What process do you use for WordPress development?

I'm interested in how other people develop themes and plugins for WordPress. To me, the in-browser editor in the admin panel just doesn't cut it. Currently, I'm just using an IDE with a PHP plugin (...
29
votes
1answer
3k views

Add multiple plugin directories

The task You can register add additional Themes directories using register_theme_directory() for your WP installation. Sadly core doesn't deliver with the same functionality for plugins. We already ...
28
votes
5answers
22k views

Creating a table in the admin-style?

What is the recommended way of creating a page with a table, in the style of the tables showing posts or users in the admin area? I am expanding the Cache Images plugin, and it contains a table with ...
42
votes
2answers
22k views

add_menu_page() with different name for first submenu item

The add_menu_page documentation says to pass the menu title as the second parameter: add_menu_page('Page Title', 'Menu Title', ...); When adding more pages later via add_submenu_page, the main page ...
14
votes
3answers
467 views

What are the common security flaws I need to look for? [closed]

As a wannabe WP plugin developper, what are the main security flaws/holes I should look for? I'm about to create a new plugin with a configuration panel (ie input fields and stuff). What should I be ...
12
votes
3answers
1k views

Conditionally enqueue a widget's script/stylesheet in HEAD (only when present on page!)

I've been trying to load scripts and styles for a WordPress widget with the following conditions... The scripts MUST load in the HEAD (else they break). The scripts must ONLY load when the widget ...
4
votes
2answers
7k views

how to create child WordPress plugin

I like to create child plugin.. Explanation :- I have one parent plugin named X. This will work independently (like other existing plugins). Now I decided to add some extra features to that plugin ...
3
votes
3answers
10k views

Category listing with thumbnail and description on home page

I really need a comprehensive solution to this, so I'm offering up almost a quarter of my rep in bounty :) I would like to have a plugin that creates a custom category listing on my home page. To do ...
10
votes
6answers
3k views

How can I add an option to the Page Template list from a Plugin?

I've been looking around for the past couple hours for a way to create a custom page template from within a plugin but haven't had any luck yet. What I am specifically trying to do is add an option ...
5
votes
2answers
595 views

Strategies to implement selective loading of plugins

I'm trying to figure out some kind of mechanism to load plugins on demand, depending on the page url, to improve performance. My primary concern is that I have some admin-ajax.php calls that are ...
3
votes
3answers
6k views

Change default admin page for specific role(s)

I was wondering if anyone knew of a plugin or a way programmatically to change the the default admin page for a specific user/role? I have a master panel page for my plugin currently setup with ...
2
votes
1answer
6k views

Email verification for new users

I would like to implement a plugin that requires new users to reply to an email, to verify their email address, on registration. I am already doing extensive codex research, but I am very new and ...
8
votes
2answers
5k views

Pass PHP variable to javascript

Is there any possibility to pass some PHP variables in javascript so I can use them later? Only in single.php. I heard about wp_enqueue_scripts but with that it is neccesary to declare a path to a JS ...
8
votes
4answers
6k 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 ...
4
votes
1answer
428 views

Turn Shortcode Gallery into Carousel in WordPress 4.4

I searched for existing plugins that could do carousels in wordpress posts but they turned out to not display correctly in WordPress 4.4 which released recently. https://wordpress.org/plugins/...
12
votes
5answers
568 views

Can a developer adopt a plugin marked as “not updated in over 2 years”?

I have come across a few WordPress plugins on http://wordpress.org/extend/plugins/ with this warning: This plugin hasn't been updated in over 2 years. It may no longer be maintained or supported ...
8
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 ...
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
431 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
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 ...
4
votes
1answer
1k views

Changing upload directory for plugin uploads only

I've spent a lot of time reading the other threads on this question, but I just cannot get my code to function properly. I'm building a plugin, and I've set up an upload form on my custom admin page, ...
1
vote
2answers
2k views

How to trap “Publish” button to check for meta box validation?

I'm trying to do some form validation on my custom meta box, and I remember somewhere reading about some javascript function to disable/enable the Publish button - except I can't find it. How do I ...
10
votes
1answer
216 views

Does the number of downloads displayed for a plug-in in the WordPress.org plug-in directory include automatic updates?

I'm wondering how the number of downloads displayed in the plugin-directory correlates to the number of actual websites using the plug-in. I realise some people will download and never install and ...
4
votes
1answer
1k views

Admin config screen without menu

I want to create a sub config from some page on admin panel, eg: I've set config menu this way: add_menu_page( 'E+', 'CRE+', 8, 'cr_e_plus_user_config', 'cr_e_plus_user_config'); add_submenu_page( '...
4
votes
3answers
1k views

How to delete custom taxonomy terms in plugin's uninstall.php?

I am writing my plugin's uninstall.php file and would like it to delete any terms that were created in the plugin's custom taxonomy. In the plugin's uninstall.php file I am using this: // Delete all ...
3
votes
2answers
3k views

How to add option box in “Edit Post” plugin API?

This might be kind of simple, but I couldn't find a way to do so in the WP docs. My plugin currently uses custom fields for things I could just have radio buttons/check boxes for each post. How do I ...
3
votes
1answer
178 views

Update a Plugin while maintaining back compatibility: general

How can I make updates a public plugin of mine without breaking the plugin for all existing users. Firstly, I'd like to change the main plugin's class/namespace, because I'd like it to be similar ...
2
votes
2answers
2k views

How to use filter hook 'post_updated_messages' in coherence with action hook 'save_post'

I am trying to send out e-mail, SMS and IM notifications to group members of this WordPress website, whenever a WordPress page in their user group has been published/updated. I figured using the ...
2
votes
2answers
2k views

How to get posts by content?

I found the following codes to get post details. However, it is not possible to get the posts by content. Does any one has any ideas? get_posts() //// get post //// $args = array( 'numberposts' ...
1
vote
3answers
1k views

Creating a theme option page?

I have a template page in Wordpress that I want the Admin to be able to change the text on that page. I'd love to learn how to make a plugin (I know how to make a plugin so that it shows up in WP, ...
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 ...