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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16
votes
7answers
47k views

How to include PHP files in plugins the correct way

My problem is when on the main plugin file I include a PHP file something like this: include(WP_PLUGIN_URL . '/wordpress-group-buying/ipn/paypal-ipn.php'); // or include_once(WP_PLUGIN_URL . ...
16
votes
4answers
10k views

Post meta vs separate database tables

When developing plugins that requires data storage, what's the pros and cons of using one method or another ? The explanation given in the codex is not detailed: Before jumping in with a whole ...
11
votes
2answers
15k views

How do I create a custom role capability?

I wish to create a custom capability for accessing the interface of my plugin. Should the plugin manage adding this capability to all the administrator accounts on activation? If so: Does WordPress ...
16
votes
4answers
788 views

Who are the most trusted plugin developers? [closed]

Note: Please vote on the question, and any answers you find useful by clicking on the UP arrow on the left hand side of the question or answer. There are so many plugins out there. Whose plugins can ...
15
votes
4answers
3k views

Plugins in symlinked directories?

When I develop plugins I test them on multiple versions of WordPress by symlinking my plugin directory in the different wp-content directories. This is great since I only have to edit the files once, ...
8
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 ...
4
votes
3answers
2k 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; ...
2
votes
3answers
5k 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 = ...
5
votes
2answers
500 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 ...
9
votes
3answers
3k 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 ...
5
votes
3answers
17k views

How to add a javascript snippet to the footer that requires jQuery

I know I can add a script file to the footer of wordpress that requires jquery using this code: <?php function my_scripts_method() { // register your script location, dependencies and version ...
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 ...
2
votes
3answers
5k 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 ...
1
vote
1answer
4k 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 ...
2
votes
1answer
4k 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
4answers
14k 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 ...
4
votes
1answer
635 views

Upload file to remote storage

I am looking to overwrite the existing upload functionality to save the file on a remote storage service. The remote storage has an HTTP interface that allow me to post file and return an addressable ...
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... ...
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 ...
4
votes
3answers
498 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 ...
4
votes
2answers
2k 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?
1
vote
2answers
549 views

Missing “category_children” option when dynamically creating categories via a plugin

I've isolated the source of a fatal error that's been occurring when a brand new site is previewed just after installing and activating the plugin I'm working on. The problem appears to be that the ...
0
votes
2answers
1k views

How to include a file using get_template_part() in a plugin?

A very simple question may be, but I'm struggling. In theme development, I worked with get_template_part() many times, and I understand its basics. But when I's developing a plugin, I wondered using ...
1
vote
1answer
228 views

Publish Post After Click On A Link

I have a frontend posting form (CF7), where user inputs (among other data of course) his email. Now I set the status to pending. What I want is, that the user would get trough autoresponder a mail, ...
0
votes
1answer
4k 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 ...
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 ...
39
votes
2answers
9k views

Autoloading & Namespaces in WordPress Plugins & Themes: Can it Work?

Has anyone used autoloading and/or PHP namespaces within a plugin or theme? Thoughts on using them? Any harm? Pitfalls? Note: namespaces are PHP 5.3+ only. Assume, for this question, that you know ...
18
votes
9answers
6k views

How to structure a plugin

This isn't a question about how to build a WordPress plugin. Rather, what, if any, guides could be applied to how to put together the file architecture of any plugin. Some other programming languages ...
23
votes
5answers
17k 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 ...
26
votes
7answers
2k views

What Plugins Demonstrate Great WP Plugin Development?

I'm going to be tackling my first plugin soon and I'm looking for plugins which you feel are of very high quality, under the hood. Stuff I can use as an example while I design the framework for my ...
14
votes
2answers
668 views

In Which Contexts are Plugins Responsible for Data Validation/Sanitization?

I want to make sure all of the data in my plugins/themes is handled securely before entering the database and before being output to the browser. My problem is that there are situations where the API ...
9
votes
3answers
10k views

How do i best handle custom plugin page actions?

I'm constantly running into the same annoyance, so i thought i'd see if there's any ideas or experience out there... I've created a plugin that uses it's own admin page. It has to. Now that i sorted ...
13
votes
1answer
4k views

Should I use custom post types or a custom database tables for plugin development?

I'm fairly new to writing wordpress plugins, but I've jumped in the deep end already and I want to make sure I'm doing it "right" on my upcoming big project. I'm going to be heavily extending ...
14
votes
3answers
448 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
2answers
951 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
6k 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 ...
28
votes
2answers
13k 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 ...
7
votes
4answers
2k views

dealing with large HTML output via plugin code

I recently wrote my first WP plugin that adds a shortcode for embedding a custom jquery image gallery into posts. It's primarily just dumps a good chunk of HTML into the post, along with javascript ...
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 ...
7
votes
4answers
4k 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 ...
12
votes
5answers
512 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 ...
7
votes
2answers
2k 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
368 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

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 ...
5
votes
1answer
126 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 ...
10
votes
1answer
196 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 ...
8
votes
3answers
1k views

Best way to abort plugin in case of insufficient PHP version?

You write a plugin which requires PHP 5.1. Someone tries to install it on a server with PHP 4. How do you deal with that in a safe and user-friendly manner?
5
votes
1answer
309 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
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( ...
3
votes
1answer
817 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, ...