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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13
votes
3answers
838 views

What are the advantages to the Settings API?

Let me preface this by saying that I hardly ever work with WordPress - in fact, the last time I did a site in WordPress was back during 2.2. Yesterday I made quite a mess of everything and asked ...
13
votes
2answers
1k views

Strategy On Building Plugin Using Eclipse

Anyone who has experience in building wordpress plugin using eclipse PDT? My situation is: I need to build plugin that extend another plugin (look at it as premium version from another plugin) I ...
13
votes
3answers
9k 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 only ...
13
votes
3answers
64k 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-...
13
votes
2answers
2k views

Is There a Plugin Life Cycle Documentation?

Is there some documentation somewhere that explains what is the life cycle of the plugins? I'm starting a new plugin with OOP style, and I just found out that my main class is being instanciated a ...
12
votes
3answers
31k views

$_POST form request with admin-post

I tried to use a form with the following markup using the action admin-post.php <form method='post' action='admin-post.php'> I'm using the action hook suggested by Wordpress to proceed the $...
12
votes
3answers
17k 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. ...
12
votes
4answers
21k 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?
12
votes
4answers
228 views

What do you think about custom designed plugin/theme options UIs?

You probably noticed the trend of making custom designed plugin/theme options UIs, especially in the commercial ones (on CodeCanyon for example - custom boxes, tabs, accordions etc). I personally ...
12
votes
2answers
4k views

How to fork a plugin?

I want to start giving back to the community, but writing a plugin from scratch is currently slightly beyond my skill level and creativity level (meaning, I don't know what kind of problem I can solve ...
12
votes
5answers
7k views

How can I update a wordpress plugin from a Git repository (github)

is there any way to easily update a plugin installed on multiple sites from a github repo. I know I can do it from the command line of each server using git pull. but is there a way to do it from the ...
12
votes
6answers
19k 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
4answers
665 views

Is it necessary to bump a plug-in's version if you're just updating the “Tested up to” attribute?

I've got a number of plug-in's hosted on the wordpress.org svn server ... with the immenent release of 3.1, I would like to update the "Tested up to" meta data. There will be no functional changes to ...
12
votes
2answers
9k 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 ...
12
votes
2answers
20k views

How to add sub-menu to a menu generated by wp_nav_menu by using plugin

I have a menu generated by wp_nav_menu which look like <ul class="nav-menu" id="menu-top-nav"> <li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-43" id="menu-...
12
votes
1answer
3k views

Custom media upload content for inserting custom post shortcode

I’m working on a plugin that creates custom post type “portfolio” along with shortcode to insert in any page or post. The shortcode is: [portfolio option1=“1” option2=“0” option3=“1” ] And it works ...
12
votes
5answers
6k views

How to debug a plugin with Xdebug?

I was able to install and setup quite easily NetBeans 6.9.1 and Xdebug on my local environment, based on PHP 5.3.0 (XAMPP). My problem now is the following: if I put a breakpoint on Wordpress's index....
11
votes
3answers
26k views

Correct way to enqueue jquery-ui

I'm having a tough time including jquery-ui scripts and styles in my plugin. It seems that my wp_enqueue_script calls are simply ignored. There are already many questions similar to this one, but all ...
11
votes
3answers
3k 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 $...
11
votes
1answer
17k 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.
11
votes
2answers
2k 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 ...
11
votes
1answer
1k views

Add self-closing shortcode button to TinyMCE in WP 4.6

I'm familiar with creating self-closing shortcodes like: // shortcode function wpse_shortcode_example( $wpse_atts ) { // Attributes $wpse_atts = shortcode_atts( array( '...
11
votes
4answers
5k views

Stop a plugin in the activation process when a certain WP version is not met then show error message in admin_notices action hook

I have a plugin that I do not want to be activated if it doesn't meet a certain WP version number then show error message in admin_notices action hook. As far as I have researched, the code below is ...
11
votes
2answers
9k views

How to Add a Third Level Sub Menu to the Wordpress Admin Menu

Is there a function, action or filter that I can use to add a third level drop-down menu to the WordPress admin menu. For instance, right now in the sidebar menu, there is a menu for posts and under ...
11
votes
2answers
6k 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 ...
11
votes
2answers
3k views

How to Add an Index to Plugin Database table

I've created some additional tables for a plugin I'm developing and need to add indexes to these tables. What's the WordPress way to do this? Using dbDelta() doesn't seem to be working, and I'm ...
11
votes
2answers
3k views

Symbolic Links on dev box with plugins and stylesheets

I'm using mac os x 10.6 with xampp. http://wp3.1/ is the url to where I have WordPress installed. The physical path is /Users/myUserName/Sites/wp3.1/ I do not install plugins or themes in the "...
11
votes
1answer
325 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 ...
11
votes
2answers
11k views

How to implement WordPress plugin update that modifies the database?

I develop a WordPress plugin, which has several database tables of its own. The plugin creates these tables when activated, and removes them when deleted/uninstalled. I have to implement an update ...
11
votes
2answers
690 views

How to check uniqueness of plugin prefix?

To avoid collisions with other plugins, one should prefix all global functions, actions and plugins with a unique prefix, e.g.: function xyz_function_name() { ... } The question is, how do I verify ...
11
votes
1answer
1k views

Plugin API for easy admin list table generation, handling & exporting of MySQL tables?

I'm aware of the WP_List_Table class (which has helped tremendously as it stands). However, I'm hunting for something even more capable - some form of API whereby you could simply 'register' a MySQL ...
11
votes
0answers
242 views

Custom collection in media manager?

I'm working on a plugin that extends the media manager, load JSON based input data to render an own collection of images and may upload them to my wordpress media library. So far I got my own tab, ...
11
votes
2answers
5k views

Should I use spl_autoload_register() in my plugin?

When I use spl_autoload_register in my plugin, I get: Fatal error: Uncaught exception 'LogicException' with message 'Class wp_atom_server could not be loaded' wp-includes\pluggable-...
10
votes
5answers
26k views

what's the meaning of the field wp_capabilities in table wp_usermeta

I am new to wordpress, in table wp_usermeta I notice that we have a row meta_key meta_value wp_capabilities a:1:{s:13:"administrator";b:1;} First, what's the meaning of ...
10
votes
2answers
14k views

What is the difference between the “wp_footer” and “get_footer” actions?

I am working on developing a plugin, and I am trying to add a line of text to the bottom of the page, I see there are two actions that seems reasonable, wp_footer() and get_footer(). wp_footer sounds ...
10
votes
3answers
14k views

How Do I Use jQuery UI In My Plugin

It's a sad day in the world when I Google something and it returns nothing. I am trying to use the default datepicker (or ANY datepicker at this point) and am unable to because of my lack of ...
10
votes
2answers
7k 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/...
10
votes
2answers
7k views

Redesigning Custom Post Type “Add New” page

I've been browsing all over google for a solution to this. I'm writing a custom post types plugin for work to log-in visitors that we get. I initially wrote a mock-up without custom post types, then I ...
10
votes
1answer
7k views

How to safely sanitize a textarea which takes full HTML input

I'm developing a plugin which enables the user to send HTML emails from within the WordPress admin. How should I sanitize the textarea input? It has to be able to contain the whole range of HTML tags ...
10
votes
2answers
10k 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 ...
10
votes
3answers
5k 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' ...
10
votes
1answer
6k views

Making my plugin multi-site compatible

I want my plugin to be installed on each blog and create database tables per blog. I have this code: register_activation_hook( __FILE__, 'install1' ); function install1() { global $wpdb; if (...
10
votes
3answers
7k views

Get a path to a different plugin

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) ...
10
votes
2answers
9k views

Why activate_plugin is not working in register_activation_hook

I am trying to activate second plugin automatically while activating first plugin. register_activation_hook(__FILE__, 'example_activation' ); function example_activation() { include_once(...
10
votes
4answers
20k views

Change the_title() of a page dynamically

I'm developing a plugin that doesn't use a custom post type, but separate database tables. It's a plugin that displays a list of courses with links that lead to the different course detail pages, ...
10
votes
6answers
5k 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 ...
10
votes
1answer
3k views

Adding more options to the instance of an image. (Attachment Display Settings)

I'm trying to build a simple reusable plugin for image presentation in Wordpress 3.9, and it seems I've hit a brick wall. I would like to be able to add a couple of options to the instance of the ...
10
votes
1answer
34k views

How can a plugin create a page/form in the front end?

How can a plugin create a page/form in the front end thats not listed in pages (if possible). it should only be accessed through a direct link.
10
votes
1answer
3k views

How can I save a multiple select array with the settings API for a plug-in options page?

I'm thinking this may be more of a problem with my PHP rather than my use of the settings API, but I can't seem to get Wordpress to save an array of data for a multi-select box. The multi-select box ...
9
votes
2answers
4k views

Settings API updated messages won't show if custom admin page not hooked into add_options_page()

Been playing around with the Settings API and found that messages (for success or errors) are only displayed when a settings page is hooked into WordPress menu via add_options_page(). Anything else ...