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Questions tagged [plugin-development]

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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135
votes
37answers
17k views

Objective Best Practices for Plugin Development? [closed]

Starting a community wiki to collect up objective best practices for plugin development. This question was inspired by @EAMann's comments on wp-hackers. The idea is to collaborate on what objective ...
90
votes
5answers
47k views

Best way to initiate a class in a WP plugin?

I've created a plugin, and of course being me, I wanted to go with a nice OO approach. Now what I've been doing is to create this class and then just below create an instance of this class: class ...
88
votes
6answers
14k views

Where to put my code: plugin or functions.php?

Is there an easy to understand scheme to decide what kind of code belongs to a plugin or the theme’s functions.php? There are many cases and many debates about that topic, mostly because there are ...
84
votes
3answers
68k 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 ...
72
votes
18answers
6k views

WPSE Plugin Repository: The plugins that came out of WP-Answers

Link your WPSE-Plugins If you answered a question and made a plugin out of your code, than this is your place to share it. The Idea: An old comment from @MikeSchinkel during the beta phase where he ...
71
votes
27answers
11k views

Software for WordPress Theme and Plugin Development? [closed]

What software do you use for your WordPress related needs? Please state your OS. On windows XP I use: filezilla (FTP) notepad++ (for reading of PHP / CSS files) firebug (a firefox extension to ...
71
votes
3answers
23k 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 ...
62
votes
2answers
102k views

How can I add an image upload field directly to a custom write panel?

I've added a new page under "Pages" in the wordpress admin, and added several custom fields. I'd also like to be able to add an upload image field to the page editor - is there some way to do this via ...
59
votes
8answers
131k 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 . '/...
57
votes
1answer
17k views

A tool to analyze rewrite rules? [closed]

Is there a good tool to analyze my rewrite rules? I always get confused with the regexes and the parameter replacements. I have created something myself and will post it here so others can use it, ...
51
votes
3answers
28k views

Difference Between Filter and Action Hooks?

I have been looking at the plugin API a bit more in depth recently and I was wondering what real differences there were between action and filter hooks. They both are events that receive data as a ...
49
votes
16answers
10k views

How do you debug plugins?

I am pretty new to plugin authoring and was having a hard time debuging. I used lots of echo and it is sloppy and ugly. I am sure there is a better way to do this, maybe an IDE with a debugger that ...
49
votes
1answer
8k views

What's the preferred method of writing AJAX-enabled plugins?

I'm wondering what the preferred method is for dealing with AJAX calls. Should one use the same plugin php file to process the POST or a separate one? Which is cleaner or safer?
49
votes
6answers
9k views

framework for plugin/theme options panel? [closed]

I found that the longest part of a plugin or theme development is creating the options panel, at least in my case. So i like to know what's your take on that. Do you use a ready made framework or ...
44
votes
5answers
45k 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 ...
41
votes
10answers
16k 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 ...
39
votes
3answers
5k 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 ...
38
votes
1answer
9k 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 ...
38
votes
10answers
13k views

What process do you use for WordPress development? [closed]

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 (...
34
votes
2answers
58k views

How to add a shortcode button to the TinyMCE editor?

How to make any plugin icon in wordpress post? The code I want to insert in plugin code and will appear in post bar [wp-admin/post.php]. Like this image: Output: If I click the icon it automatically ...
34
votes
4answers
7k views

Where do I put the code snippets I found here or somewhere else on the web?

Many posts here or somewhere else contain code, but they do not say where to put it. Example: I have found this post: How do I turn off 301 redirecting posts (not canonical)? I'm a newbie with PHP. ...
34
votes
3answers
20k views

What are the differences between WPINC and ABSPATH?

It's common for plugin developers to protect their plugins from direct access. I saw two ways to do that: if ( ! defined( 'WPINC' ) ) die; and if ( ! defined( 'ABSPATH' ) ) exit; What are the ...
33
votes
7answers
3k views

What Plugins Demonstrate Great WP Plugin Development? [closed]

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 ...
32
votes
5answers
45k 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 ...
32
votes
1answer
20k views

Settings API with arrays example

I'm using the Wrox WordPress plugin development book as a primary reference for getting started with a new plugin and I understand all settings can be saved as 1 array but the book does't give an ...
30
votes
1answer
8k views

Is it possible to reuse wp.media.editor Modal for dialogs other than media

To expand: I'd like to utilize the same Modal code/appearance ( as used in wp.media.Modal, wp.media.FocusManager ) to open a modal of my own custom dialog, not the Media Editor. In the past, I've ...
29
votes
2answers
5k views

Enhance Media Manager for Gallery

I would like to enhance the Media Editor, after WordPress 3.5, on the gallery view. I want to add a new select field on the right side and send the selected values to the gallery shortcode. I think, ...
29
votes
4answers
22k 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 ...
29
votes
5answers
20k 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 new ...
29
votes
5answers
9k views

Is there any plugin development framework

Since I am new to WordPress plugin development I have been examining the internal structure of many plugins. I have found that most of them don't fit any pattern and so understanding how they work can ...
28
votes
3answers
28k views

Should I use wpdb prepare?

I'm new to SQL and am wondering if I need to use wpdb->prepare for the following query to a table I've created global $wpdb; $tablename = $wpdb->prefix . "my_custom_table"; $sql = "SELECT * ...
27
votes
5answers
58k 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 ...
26
votes
2answers
64k views

How to get the path to the current theme?

This code is used to get the directory of the current plugin: plugin_dir_url( __FILE__ ). What should I use to get the directory of the current theme?
26
votes
5answers
22k views

How do I add CSS options to my plugin without using inline styles?

I recently released a plugin, WP Coda Slider, that uses shortcodes to add a jQuery slider to any post or page. I am adding an options page in the next version and I would like to include some CSS ...
26
votes
3answers
40k 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 ...
25
votes
2answers
75k views

ajaxurl not defined on front end

I am trying to create a ajaxform on the front side. I am using the code jQuery.ajax( { type: "post", dataType: "json", url: ajaxurl, data: ...
25
votes
3answers
12k views

Why does WordPress use outdated jQuery v1.12.4?

While checking the source code, I saw that WordPress uses jQuery v1.12.4. Why does WordPress use this outdated version of jQuery?
25
votes
1answer
787 views

Adding Custom Text Patterns in the WP 4.5 Visual Editor

4.5 is out and with it new Text Patterns. I would like to know how to go about adding my own custom patterns. Taking a look at wp-includes/js/tinymce/plugins/wptextpattern/plugin.js it seems pretty ...
22
votes
4answers
1k views

Automatically determine minimum WordPress version required for a plugin?

When developing a plugin, is there a way to automatically determine the minimum version of WordPress that's required to run it? I want to make sure that the Requires header is accurate, but manually ...
21
votes
3answers
27k 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 ...
21
votes
1answer
5k views

What is the advantage of using wp_mail?

What is the advantage of using wp_mail() over mail(). Codex says they're similar, but they seem to be very similar.
21
votes
2answers
943 views

Is it ever okay to include inline CSS in plugins?

Normally in a plugin I would add styles using wp_enqueue_style. However, I am currently creating a plugin that only needs a few lines of CSS and I am wondering if it might be better to serve the ...
20
votes
4answers
15k views

What's the difference between term_id and term_taxonomy_id

The title says it all. At the moment in my custom taxonomies I'm getting the terms using the term id and taxonomy name. Thought this question would've been asked before but can't find it anywhere! So ...
20
votes
3answers
2k views

How many times will this code run? (or, how rich is grandma?)

Hypothetical example but real world applicability (for someone learning, like me). Given this code: <?php function send_money_to_grandma() { internetofThings("send grandma","$1"); } ...
20
votes
3answers
18k views

Add custom TinyMCE 4 Button, Usable since WordPress 3.9-beta1

How is it possible to add a custom button to the visual editor TinyMCE, Version 4? Currently I found this q&a with a little bit hints to the topic, but not a solution or a how to. But I can't ...
20
votes
1answer
2k views

How to create an API for my plugin?

I have been developing plugins for WordPress, most plugins I have developed use two or three classes, hence not as huge as Buddypress or WooCommerce. I am planning to develop two open source plugins ...
20
votes
4answers
4k 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, ...
19
votes
2answers
12k views

How to make a WordPress plugin translation ready?

What is the best way create a plugin that is translation ready? It doesn't have to be translated from the beginning but it has to be easily translatable so fellow developers from different cultures ...
19
votes
5answers
20k views

“Error: Options Page Not Found” on Settings Page Submission for an OOP Plugin

I am developing a plugin using Tom McFarlin's Boilerplate repository as a template, which utilizes OOP practices. I've been trying to figure out exactly why I'm unable to correctly submit my settings. ...
19
votes
4answers
4k views

Delete WordPress plugin Repository

I wanted to create a WP plugin. So I requested and my request was approved by WordPress.org But I don't want to develop that plugin anymore. How can I delete the repository forever or request its ...