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Questions tagged [functions]

A function is a sequence of program instructions that perform a specific task. It is packaged as a unit that can be used wherever the according task should be performed.

324
votes
108answers
152k views

Best Collection of Code for your functions.php file [closed]

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. As with many others who are now viewing this post, I have been ...
75
votes
3answers
28k views

Between functions.php, widgets and plugins, which is loaded first?

Customer asks if a specific carousel plugin he uses can be widgetized. That means I should create a widget inside functions.php which calls the plugin's function. That means that the plugin's code has ...
56
votes
6answers
78k views

What's the difference between home_url() and site_url()

My understanding is that site_url() returns the location where the wordpress core files are. So, if my blog is hosted at http://example.com/blog then site_url() returns http://example.com/blog But ...
54
votes
8answers
118k 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 . '/...
42
votes
8answers
72k views

Remove “Category:”, “Tag:”, “Author:” from the_archive_title

I have the following code in my theme's archive.php: <?php the_archive_title( '<h1 class="page-title">', '</h1>' ); ?> This gives me titles like "Category: Russia", "Tag: America", ...
41
votes
5answers
69k views

Changing Admin Menu Labels

I have spent the last day using the functions.php file to fully customize WordPress for my client sites. I am amazed at how much I have been able to accomplish and how much easier it will make things ...
37
votes
6answers
72k views

How to customize the_archive_title()?

In my child theme's archive.php, I have the following code for displaying the title of my archive pages: <?php the_archive_title( '<h1 class="page-title">', '</h1>' ); ?...
34
votes
5answers
39k views

Get the blog page URL set in Options

I have set the blog to be a different page other than the home page. I want to have a link from single.php to this blog page. Is there any function that pulls out URL for the blog ?
33
votes
10answers
61k views

remove empty paragraphs from the_content?

Hey guys, I simply want to prevent the creation of empty paragraphs in my wordpress post. That happens quite often when trying to manually space content. I don't know why this doesn't take effect? /*...
32
votes
5answers
39k 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 ...
31
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. ...
29
votes
1answer
15k views

How to override parent functions in child themes?

I've been reading around and trying to figure out how to do this, but for some reason I can't seem to override parent functions in my child theme. I'm using TwentyTen as a parent - can anyone tell me ...
28
votes
3answers
47k views

How come Featured Image isn't showing up in my Custom Post Type?

I have thumbnail support added with the following in my functions.php // Add Thumbnail Support add_theme_support('post-thumbnails'); set_post_thumbnail_size( 140, 140, true ); And I create the ...
27
votes
4answers
36k views

Why use if function_exists?

I noticed a lot of developers of WordPress themes would use this in functions.php if (function_exists('register_nav_menus')) { register_nav_menus (array('primary' => 'Header Navigation')); } ...
26
votes
2answers
42k views

get_template_directory_uri pointing to parent theme not child theme

The problem I am having is that the get_template_directory_uri is pointing to the parent theme like site/wp-content/themes/twentythirteen/myGallery/gallery_functions_include.php but I want it to ...
26
votes
4answers
154k views

How to set and use global variables? Or why not to use them at all

UPDATE: My original question has been solved, but this is turning into a valid discussion about why not to use global variables, so I am updating the question to reflect that. The solution was <?...
25
votes
2answers
36k views

Redeclare/Change Slug of a Plugin's Custom Post Type

Is it possible to redeclare/change the slug of a plugin's existing custom post type (without simply editing the plugin)? That is, if Plugin X creates a custom post type with the slug /uncookedtoast/, ...
21
votes
4answers
332 views

How long does a deprecated function live in core?

I'm curious to find out the process/philosophy behind removing deprecated functions from core. The Codex says this: These functions below have been deprecated. That means they have been replaced ...
20
votes
1answer
17k views

What is the “with_front” rewrite key?

I have the following line in a register_post_type function: 'rewrite' => array('slug' => 'Newsletters', 'with_front' => false), I understand what the line does in general (adds "newsletters"...
19
votes
2answers
33k views

Add multiple custom fields to the general settings page

What I would like to do is to add a few custom fields to the general settings. This is the code that I'm using. It works alright but I just cant figure how to add more fields. I would like to create ...
19
votes
3answers
14k views

Solution to render Shortcodes in Admin Editor

I have asked this question about a year ago and I am hoping there is some type of simple solution which will allow me achieve my objective. So here it goes: I often utilize shortcodes within the ...
17
votes
2answers
14k views

Manually set global $post vars with an ID, in order to use template tags

I have a function retrieving ID's of posts by very specific means. I need to be able to set the global $post in order to use functions like the_content(), which does not allow an ID as a parameter. ...
16
votes
5answers
32k views

How do I remove UL on wp_nav_menu?

I search on this site and found many answers for this question. Most of them is not working on my theme. Here is a one solution I found and it's working according to my need. function ...
16
votes
3answers
12k views

remove_action on after_setup_theme not working from child theme

I am trying to remove a theme action for an elegant-themes theme using a child theme.. This works when I remove action after add_action code anywhere in the parent theme functions.php. However, it ...
16
votes
3answers
16k views

How to change default position of WP meta boxes?

Im wondering if there is a way to change the default position of Wordpresses meta boxes such as "featured image" for custom post types without having to drag them manually? Example:
15
votes
5answers
48k views

Ajax call always returns 0

I have a problem with AJAX returning 0 always! I have done everything by the book and can't figure out what is wrong? Please help!! Here is my Ajax call: //Pass data through AJAX var ...
15
votes
3answers
20k views

Disable plugin / plugin action via theme

I have installed the Google Analyticator plugin on my site. I am also using the MobilePress plugin to serve up a theme designed for non-smart-phone mobile browsers. I have set up Google Analytics for ...
15
votes
5answers
4k views

Best way of passing PHP variable between partials?

I have a variable in header.php, such as: $page_extra_title = get_post_meta($this_page->ID, "_theme_extra_title", true); Once I do: var_dump($page_extra_title); I always get NULL outside of ...
15
votes
4answers
27k 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): ...
15
votes
3answers
23k views

Upload Multiple Files With media_handle_upload

I have a WordPress form plugin and I use media_handle_upload to upload the files and get there ids directly and attached its ids to the post as a meta date, I used the following to did that: The HTML ...
15
votes
4answers
1k 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 ...
14
votes
1answer
10k views

Why does WordPress add 0 (zero) to an Ajax response?

Unless I end Ajax processing function by exit() or die(), the Ajax function receives desired and correct output but following by 0. Any idea why is that happening? Is that meant to be like that or ...
14
votes
5answers
34k views

wp_enqueue_script was called incorrectly

Hello I don't know how but now I am getting this error Notice: wp_enqueue_style was called incorrectly. Scripts and styles should not be registered or enqueued until the wp_enqueue_scripts, ...
13
votes
1answer
14k views

plugins_url vs plugin_dir_url

Im seeing WordPress plugins either use plugins_url or plugin_dir_url when creating constants to some of their folders. Is one better than the other? examples: define( 'MEMBERS_URI', trailingslashit( ...
12
votes
5answers
12k views

How to use a custom post type archive as front page?

I'd like to use a custom post type archive as a site's front page, so that http://the_site.com/ is a custom post type archive displayed according to my archive-{post-type}.php file. Ideally I ...
12
votes
4answers
5k 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 ...
12
votes
4answers
11k views

Passing arguments to a admin menu page callback?

Situation: I'm working on a plugin and I'm developing it as a class, everything worked fine until I run into this situation. I wanted to make things a bit cleaner and tried this.. class MyPlugin { ...
12
votes
2answers
36k views

400 bad request on admin-ajax.php only using wp_enqueue_scripts-action-hook

I've been working on ajax lately. The tutorials you find on the net are all very similar and quite easy to implement. But I always get a bad request 400 on my ajax-admin.php After a long and ...
12
votes
2answers
2k 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 ...
11
votes
4answers
33k views

How to add a data attribute to a WordPress menu item

I'm Twitter Bootstrap and need to add data-toggle="modal" attribute to the a tag of menu link. Upon searching most all results reference doing a walking for Twitter Bootstrap dropdown menus however ...
11
votes
9answers
23k views

Adding fields to the “Add New User” screen in the dashboard

I'd like to add the field "Company Name" to the add new user page in the admin panel. I've done quite a bit of searching and have been unable to find details on how to do this. I can easily add info ...
11
votes
4answers
4k views

Issues with title-tag and document_title_parts

Wordpress version 4.5.1 I'm trying to dynamically update page titles on a particular template. After lots of digging and learning about the wp_title() changes, I'm attempting to use ...
11
votes
5answers
7k views

How to load parent_theme functions.php before child_theme?

I got the problem that i have to load my parent theme's functions.php file before my child theme's functions.php file loads. This is needed for the setup & init procedure. I looked at the hooks ...
11
votes
4answers
2k views

Add image size if page template

I'm building a members website with WordPress Multisite. Is it possible to restrict how many images are being generated depending on the selected template? I have tried the following lines of code ...
11
votes
1answer
4k views

Using classes instead of global functions in functions.php

In many themes I've seen (including TwentyEleven) and in the examples I've found online, when building the functions.php file for a theme all functionality is declared in a global scope. To clarify, ...
10
votes
6answers
18k views

How to check if a user exists by a given id

Is there any way to check if a user id exists? I want to create a function similar to username_exists() but which returns if the id exists or not.
10
votes
2answers
31k views

Adding a second email address to a completed order in WooCommerce [closed]

Before I ask this question, I know there is a (legitimate) hesitation to answer questions here about Woo products since they have their own support and their users should be encouraged to use that. I ...
10
votes
5answers
5k views

Is there any global functions.php file which works for any theme?

Is there some global kind of functions.php file that works for any theme? The problem is here: When I change a functions.php file in any theme, I need to take care of two changes: First, I need to ...
10
votes
6answers
25k views

Why isn't is_page working when I put it in the functions.php file?

I have page called "Apple", the page's ID id 2533. In page.php file I have line: echo $bannerimg And this function in functions.php: if ( is_page( '2533' ) ) { // also tested with 'Apple' ...
10
votes
2answers
26k views

How do I get the current edit page ID in the admin?

Most solutions I found are for front-end use. This is for a plugin, so the all activity is in the back-end. How do I get the page ID that's being currently use(edited) in the admin? Note I'm out of ...