The server-side programming language that the WordPress core, plugins and themes are written in.

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37
votes
5answers
26k views

What are PHP extensions and libraries WP needs and/or uses?

Codex loosely only mentions PHP version in server requirements, however PHP can be configured in pretty wide range of excluding/including different parts. What are extensions/libraries that: are ...
27
votes
6answers
4k views

Using OOP in themes

I see a lot of plugins making use of object-oriented coding when there isn't really necessary. But what's even worse is that theme developers are starting to do the same thing. Commercial themes and ...
26
votes
5answers
19k views

How to get WordPress Time Zone setting?

Can someone tell me how to get the time zone that is set in the WordPress Admin? For example, if the blog is set to Eastern time, I need this exact string to print out: US/Eastern This is for a ...
22
votes
5answers
2k views

Should all plugins be encapsulated in a Class?

When developing a plugin should the functions be grouped together into a Class to avoid namespace conflicts? Does using classes create performance overheads for PHP? If there is a performance hit, ...
19
votes
7answers
70k views

How to retrieve the slug of current page?

I am trying to retrieve the slug of the current wordpress page outside the loop. The title of the page returns with wp_title () but how can I get the slug? <li><a ...
16
votes
3answers
3k views

How exactly do automatic updates work?

I received an email this morning stating that my Wordpress site had been automatically updated to the latest version. I knew about the feature but I've always wondered exactly how it works. PHP isn't ...
15
votes
1answer
35k views

Allow HTML in excerpt

Here is my excerpt code. // Generate custom excerpt length function wpbx_excerpt_length($length) { return 300; } add_filter('excerpt_length', 'wpbx_excerpt_length'); How do I allow html like ...
15
votes
4answers
870 views

Why have <?php and ?> on every line

I've seen this convention pretty much everywhere, and, at times, it comes close to driving me nuts: <?php //The loop ?> <?php while ( have_posts() ) : the_post(); ?> <?php ...
14
votes
4answers
32k views

WP insert post PHP function and Custom Fields

The WordPress function is used for submitting data programatically. Standard fields to submit to incude the content, excerpt, title, date and many more. What there is no documentation for is how to ...
14
votes
5answers
15k views

Sending the reset password link programatically

I have this manually created page: $user_login = sanitize_text_field( $_GET['user_login'] ); if ( username_exists( $user_login ) || email_exists($user_login) ) { ?> <!--Everything has been ...
13
votes
1answer
3k views

How can I use WordPress functions in my stylesheet?

I have my style.php file looking like this. <?php header('Content-Type: text/css');?> #div{ background:<?php echo get_option('bgcolor');?>; } This does not work, but when I do ...
13
votes
2answers
7k views

How to create custom 401, 403 and 500 error pages?

When a 404 error is encountered, a 404.php template file can be used to render a custom error message. This is documented in the Template Hierarchy article. My aim is to create custom error pages ...
12
votes
4answers
9k views

User registration followed by automatic login

I am using a plugin modified for my purposes. What I am after is after the user has registered for it to automatically log them in and return them to the current page. At the moment it sends them an ...
11
votes
5answers
4k views

Inserting terms in an Hierarchical Taxonomy

I'm really having a few issues with inserting terms. Here is my scenario: I have a taxonomy called veda_release_type: //Release Type and Region $labels = array( 'name'=> ...
11
votes
4answers
22k views

How to manually fix the WordPress gallery code using PHP in functions.php?

It's been talked many times that Wordpress outputs some really bad code for the built-in gallery function. This is the core code responsible for the gallery output (in /wp-includes/media.php): ...
11
votes
3answers
461 views

How to deprecate a function used in a plugin?

One of the functions I'm using in my plugin is polluting the global scope with a name that could collide with another function (used in another plugin). So, I guess I should deprecate it. But how ...
11
votes
1answer
273 views

Why isn't WordPress part of Framework Interop Group?

Are there any technical reasons that prevent WP to be part of Framework Interop Group?
11
votes
1answer
341 views

Are WordPress Heartbeat API 'beats' staggered or do they occur simultaneously for all users?

The WordPress Heartbeat API uses admin-ajax.php to run AJAX calls. If User X leaves their browser open, many calls will be made to the server, with each call happening when there is a 'beat'. Now if ...
11
votes
2answers
9k views

Getting only direct child pages in WordPress with get_pages

I am trying to fetch all direct children of a page. But I am getting all children and grand children as well. Any ideas? PHP Source: $args = array( 'child_of' => $post->ID, ...
11
votes
2answers
1k views

How to make a image-size selected by default in Media upload - WP v3.5

Bare with me. I want to have a custom image size selected by default in the Media upload popup page. In Wordpress v3.4.2 and prior, this elegant code worked fine: function ...
10
votes
9answers
5k views

Adding first / last CSS classes to menus

is that possible, without javascript hacks? like this: <ul class="my_menu"> <li class="first"> ... </li> <li> ... </li> <li> ... </li> <li ...
10
votes
2answers
654 views

To close or not to close php

I have read that it is advised (especially with php 7) to not close the php files with ?> Many of my WP php files end like this: <?php get_sidebar(); ?> <?php get_footer(); ?> ...
10
votes
1answer
7k views

How to include checkbox in widget backend form?

I'm trying to include a checkbox in my widget back end. But I cannot get the value (on or off) after the user submits it. I thought the value would be stored in "esc_attr( $check )" (as it is when ...
10
votes
1answer
759 views

How do I make an HTML table from a database table?

is there a built-in wordpress function to make the HTML or should I use plain-old PHP?
10
votes
2answers
4k 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 ...
10
votes
1answer
439 views

Limit the number of inactive widgets

I'm trying to restrict the number of widgets from the "wp_inactive_widgets" sidebar to maximum 10, because the widgets admin page is incredibly slow: add_filter('pre_update_option_sidebars_widgets', ...
9
votes
5answers
9k views

Converting timestamps to local time with date_l18n()

I've got a WordPress cron job that sends an email periodically and saves the timestamp when it was sent as an option, and I'd like to display a date on a settings page. Something like, "The last ...
9
votes
2answers
1k views

Can I use the same nonce for multiple requests on the same page?

Or does this break the purpose of the nonce, which I admint I don't quite understand it? :) For example on two ajax requests that run on page load, or when something is clicked: $.ajax({ type: ...
9
votes
1answer
4k views

Mega Menu Walker

I'm trying to create a mega menu walker. Unfortunately, walkers completely escape my coding knowledge. I could really use some help getting it working. Here's the features I need: Wrap the ...
8
votes
3answers
2k views

How to change the case of all post titles to “Title Case”

I am helping my father with his WordPress website. It has over 1,700 posts with TITLES IN UPPERCASE. We'd like to change these to "Title Case" in the database (possibly using this PHP script). The ...
8
votes
3answers
2k views

What's the best way to use the Featured Image for responsive web design?

I have a brilliant idea and since WordPress already takes care of some of the work, I just need to find a good method to make this work. I am working on a project that needs to be responsive to all ...
8
votes
1answer
687 views

WordPress Themes and PHP unit

Is there any examples of using PHP unit tests with WordPress themes, seems a lot of blogs out there on the subject are out dated as the core unit tests are apart of trac, yet last night - I pulled ...
8
votes
1answer
9k views

How does printf( __( ) ); work?

Today I work through a theme to get a better understanding of WordPress and templating. I discovered this: <?php printf( __('Designed by %s', 'Anyword'), '<a ...
8
votes
5answers
3k views

Wordpress and magic quotes

I've been writing some Wordpress plugins, and I've been having some problem with Wordpress putting magic quotes on POST and GET data. Specifically, the "wp_magic_quotes" function in ...
8
votes
3answers
463 views

Make Google index the entire post if it is separated into several pages

While this is a question, it is as well a serious warning to publishers that separate their posts using <!--nextpage-->. Bare with me. I run a highly trafficked multiple author platform that ...
7
votes
4answers
5k views

the_date() not working

I am using wordpress 3.2 and I did a query post like this: <?php query_posts("posts_per_page=1post=type&page=post_parent=10");?> Then I try to echo out the date of this post I queried ...
7
votes
6answers
3k views

Where to store PHP files created by plugin / themes

There are cases in which a plugin or theme needs to create a php file somewhere that can later include it. For example a captcha plugin, or some kind of a templating system like twig/smarty (In my ...
7
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 ...
7
votes
4answers
5k views

Only get_posts of certain post formats

I'm trying to create a archive list with only my "normal" post format articles (not link, aside, quote, etc formats). How would I implement has_post_format( 'standard' ), or something similar, into ...
7
votes
1answer
3k views

How can I fetch loop of post titles via AJAX?

I have a list of the most recent post titles in sidebar.php. Here is an example of how that code looks: <?php $args = array('posts_per_page' => 20); ?> <?php $sidebar = new ...
7
votes
6answers
1k views

Is there a way to use the Wordpress users but without loading the entire Wordpress core?

I have a Wordpress site and a web application that can be used only by the registered (Wordpress) users. Now I'm loading wp-blog-header.php to check if the user is logged in. Everything is working ...
7
votes
2answers
13k views

Display all values of custom a field created with ACF on a page

I'm using Advanced Custom Fields / ACF to create custom fields. One of them is a list of checkboxes that display some options (option1, option2, option3...). Now I want to display all options of ...
7
votes
1answer
4k views

Contact form redirecting to page not found on send

I have a contact form that I used lot's of times before on other non WP sites but it doesn't seem to work on my current WP site, it just redirects you to a page not found. I don't want to use any ...
7
votes
2answers
262 views

Why do templates contain so many PHP tag pairs?

I have some PHP experience, but hardly any WP theme writing experience...I'm just starting the journey. All of the themes I have looked at so far in the .org repository have code that looks like ...
7
votes
2answers
712 views

Wordpress and event-driven programming - what is it about?

I want to state very clearly that this does not intend to revive the discussion about functional/procedural programming versus object-oriented programming. There is plenty said about that, on WPSE and ...
7
votes
2answers
2k views

Remove “Insert from URL” link in Media upload - WP 3.5

How do I remove the Insert from URL link in the new Wordpress 3.5 Add Media popup page? In earlier versions of Wordpress, this worked fine: // removes URL tab in image upload for post function ...
7
votes
2answers
5k views

Any guides on creating custom admin pages?

I basically want to create a table (preferably AJAXified) that lets the user enter a line of information, and be able to add new lines of information, and delete selected ones. I've found this post ...
7
votes
3answers
949 views

Adding custom input for data attribute in insert media modal

I'm trying to add a text input to the "Insert Media" modal in the hopes of being able to add an html5 data- attribute to the images' parent anchor. <a class="fancybox" href="..." ...
7
votes
1answer
1k views

Wordpress Admin Bar pushed Sticky Footer off the bottom of the page

I've implemented Ryan Fait's oh-so-common sticky footer in a custom Wordpress theme. I've noticed now if I implement the Wordpress Admin Bar into my pages, which is 28px high (in current Wordpress ...
6
votes
4answers
385 views

Cleaning up WordPress to improve performance?

Looking over the current WordPress codebase it's clear that functions are over-used. My count is over 8,100 functions/methods are defined inside the WordPress codebase. That is terrible, and a ...