Questions tagged [php]

For questions about the server-side programming language that the WordPress core, plugins and themes are written in. Questions about using PHP outside a WordPress context are off-topic but might be asked on Stack Overflow.

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104
votes
14answers
397k views

How to get URL of current page displayed?

I want to add custom PHP code to ensure that whenever a page on my site loads in my browser, the URL of that page is echoed to the screen. I can use echo get_permalink(), but that does not work on ...
92
votes
11answers
119k 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 ...
70
votes
6answers
102k views

What is the correct way to use WordPress functions outside WordPress files?

I read about 2 methods for initializing WordPress function outside of WordPress files so We can use these functions on any page or website outside the WordPress blog. Which one of these 2 methods is ...
63
votes
3answers
126k 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 <...
61
votes
8answers
78k 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 ...
48
votes
7answers
125k views

how to get page id of a page using page slug

I'm pretty new to WordPress and I was wondering if I could get a page id with its slug. Is it possible please let me know?
44
votes
10answers
127k views

Check if current page is the Blog Page

I'm new to WordPress. I am looking for a way to check if current page is the blog page in the code of the header file. I've checked but I can't find a way. Help me, Pls.
42
votes
4answers
235k 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 <?...
42
votes
3answers
29k 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 ...
41
votes
8answers
60k 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 ...
40
votes
1answer
98k views

How to add product in woocommerce with php code [closed]

I want to add products with PHP code like below: $post_information = array( 'post_title' => 'new item shop', 'post_content' => 'this is new item shop', 'post_type' => 'post', '...
38
votes
6answers
8k 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 ...
33
votes
3answers
161k views

Show all terms of a custom taxonomy?

I made a few custom taxonomies and I need to show ALL the terms from it, what I achieved so far is showing the taxonomies that are selected/chosen in a custom post type but I need all of them to show, ...
32
votes
3answers
9k 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 ...
31
votes
2answers
72k views

what is correct way to hook when update post

i try to hook when post is updated but all hook i try never executed except updated_post_meta add_action('updated_post_meta', 'my_function'); function my_function($post_id) { echo 'This is ...
31
votes
5answers
3k 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, ...
30
votes
5answers
75k views

How to update custom fields using the wp_insert_post() function?

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 ...
29
votes
1answer
35k 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 ...
28
votes
5answers
2k 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 ...
26
votes
3answers
53k views

Most efficient way to add javascript file to specific post and/or pages?

I am wondering what the most efficient method is to add a javascript file specifically for a post and/or page. Here are a few solutions I came up with: Switch to HTML editing view and post your ...
24
votes
2answers
29k 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, '...
23
votes
5answers
10k views

Running WP Cron on multisite the right way

I have WordPress Multisite with several sites. I set up DISABLE_WP_CRON to true in my wp-config.php. If we set up cron task with wget or curl we have 30 sec rule to execute PHP script. It's so small ...
23
votes
2answers
10k 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 this ...
22
votes
5answers
32k 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 like ...
22
votes
1answer
56k views

How do I use WP_query with multiple post IDs?

I want to query multiple posts with an array of IDs (note: I am querying a custom post type). Here's what I have, which isn't working: $myarray = array(144, 246); $args = array( 'post_type' =>...
22
votes
2answers
43k views

Query multiple custom post types in single loop

I'm aware there are several other posts that cover similar ground to what I'm about to ask. I have three custom post types running, in addition to 'posts'. I want to run a loop that pulls all posts ...
21
votes
2answers
101k views

How to return number of found rows from SELECT query

I wrote a function which is supposed to return the number of rows found in a SELECT query but it always either seems to return 0 or an array. I have been messing around with this for about an hour now ...
19
votes
8answers
42k views

Disable email notification after change of password

I want to disable the email notification if a user or an admin changes the password of a user. After some Googling I came to find that I need to create a plugin and overwrite the ...
19
votes
1answer
22k views

How can I see all the actions attached to an "add_action" hook?

I'm working with the admin bar and trying to debug some of the menus and their priorities. I know several callbacks get bound to actions, such as this one: add_action( 'admin_bar_menu', '...
19
votes
1answer
22k views

Setting $_SERVER['HTTPS']='on' prevents access to wp-admin

First off my server is sitting behind a load balancer. My SSL certificate sits on the load balancer and handles HTTPS. The data coming in on port 443 is forwarded to the Wordpress server using HTTP ...
19
votes
1answer
22k 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 ...
19
votes
4answers
2k 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 ...
17
votes
6answers
36k 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 ...
17
votes
7answers
8k 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'=> _x('...
17
votes
2answers
5k 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(); ?> Should ...
17
votes
1answer
77k views

What is the meaning of %s, %1$s etc.? [closed]

From a Q&A Thread I've came to meet with some old things, but I'm afraid, I found myself in a condition that, I still don't know the meaning of them and don't know why to use them. %1$s - (found ...
16
votes
2answers
65k views

get current category ID php

I'm trying to get category ID of the current archive displayed. I tried: // category (can be a parent category) $current_cat_ID = get_query_var('cat'); // print_r ($current_cat_ID); It doesn't ...
16
votes
1answer
12k 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 ...
16
votes
4answers
30k 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): ...
16
votes
4answers
15k 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 ...
15
votes
5answers
57k views

Setting custom cookies in Wordpress

I am trying to set cookies to re-route returning users to my a specific page within my Wordpress site. I'd like some advice with these 2 things: Where in the Wordpress php files should cookies be ...
15
votes
9answers
8k 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 class"...
15
votes
3answers
6k views

Remove update nags for non-admins [duplicate]

I'm trying to remove or hide the update nags for non-admin users. As an admin, I see: The popular answer I've seen to handle this says to use: function hide_update_nag() { if ( !current_user_can(...
15
votes
1answer
601 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 ...
14
votes
4answers
48k views

Get page content using slug

I'm trying to get page content when I only know the slug string. Is there a function for this, or an easy way to do this or is this a case of doing it via SQL? Thanks very much
14
votes
3answers
108k views

How to get permalink and title from post ID?

I have stored an array of post IDs and I would like to list the posts as links, meaning I need to get the title and permalink for the post ID - $id. The list should be echoed out by the following if ...
14
votes
5answers
9k 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 ...
13
votes
6answers
8k 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 ...
13
votes
4answers
114k views

How to correctly add Javascript in functions.php

I would like to remove some ugly looking arrows that are standard on cart buttons in WooCommerce. To achieve this, I found a tip of adding the following code, which should remove the arrows when the ...
13
votes
2answers
4k 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: '...

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