You are most probably trying to use wp_create_category()
on the front end, which will lead to the fatal error. wp_create_category()
is not available on the front end, only backend.
You should hook your function to at least admin_init
where wp_create_category()
is available.
Just a note, looking at the source code, wp_create_category()
uses category_exists()
which is quite expensive to run on every page load, so you would want to run this once like on a plugin or theme activation hook
Related Posts:
- How long does a deprecated function live in core?
- Warning/Notice about functions.php
- Use ‘add_theme_support’ instead of ‘add_custom_image_header’ In WordPress 3.4
- Pass parameter to hooked function using custom page template
- Deprecated function get_user_by_email($email)
- WordPress 6.0 upgrade caused my custom function to stop working
- How to customize the_archive_title()?
- How to override parent functions in child themes?
- Trying to use add_action and do_action with parameters
- Define page template in wp_insert_post
- Safe to disable wptexturize?
- Get a list of all available fields in the User Profile
- How do I use the WP image functions in a page template?
- How to remove Customize from admin menu bar after WP 4.3
- Child theme functions.php do I use php open and close tags?
- why doesnt is_home() work in functions.php
- Insert Ad Code in the Middle of a Post
- Enabling shortcodes for custom fields
- Passing variables to templates (alternatives to globalizing variables)
- Load post with a different template?
- Add options to featured image
- WordPress Change Post Templates,but not drop down, but Image selection
- Programmatically Add Font-Awesome Icons to Category Widget
- Dynamically Register Sidebars For Each Top Level Page
- Two different menus for two different locations?
- Run Product Filter Javascript On Page Template
- Most efficient way to get custom database records from 20 buttons and 20 tables?
- How to add a column to the Trash page?
- Custom registration URL lost when user makes signup mistake
- Images uploaded using media uploader are appearing upside down
- Individually styling date month year [closed]
- Empty Date Returned on my function
- Woocommerce Attributes pulling in wrong data
- How to get the post_name when in preview?
- Tiny MCE-modifications (plugins) stopped working in WordPress 5.6
- Can’t check if a post has thumbnail adding filter to get_post_metadata()
- How to hook into a function offered by a plugin?
- Echo tags used to describe the theme
- Change position of media in admin menu
- How to Display Frontend CSS for Administrator only
- How can I change a function in a parent theme via a child themes functions.php
- How can I remove the main description text box in a Woocommerce product editor page? I only use the “Product short description” text box [closed]
- Automatically assign video ‘poster’ value to ‘filename’ for archive listing
- How can I make a widget shortcode to control all the widgets?
- Unique sequential reservation code
- new_excerpt_more link not working properly
- Where to add the permalink in this function?
- WordPress function saves a post twice and updates all posts
- Change CSS for logged in users
- Always the Latest google jQuery instead of default WordPress jQuery
- if statement for wordpress default featured image on single post
- Function to display post by specific author
- Override the WordPress core function wp_referer_field
- Return category name with & Ampersand doesnt work
- Control the srcset much more (not all sizes in it each time)
- How to add_filter html template to middle of content
- How can we know we are not in edit page
- Adding jQuery datepicker to Custom Post Type Metabox [closed]
- User function to return multiple get_post_meta()
- wordpress acts like functions.php doesn’t exist [closed]
- How can i unload effect.min.js file?
- How can I pass a shortcode value to the head in wordpress functions.php
- Native gallery custom html output
- WordPress wraps span tags into p tags
- Auto scroll to id on page load on all pages except home page. Only do this on mobile
- How to add schema markup to WordPress menu function
- Use add_action within template
- Replace admin header logo with an image
- contact form in template with jquery,validate and ajax
- Changing the header image using WPML
- How to require a config file in a template and in function.php?
- Issue passing action class to nested function. Admin Columns
- Populate Product Regular Price with a calculated ACF Field Value
- Header menu aligned right on all pages except for single-post page [closed]
- How Do I Unhook This Parent Theme Function?
- How to make the RTL.css the dominant css code?
- How to create an array if ’empty’?
- Auto remove tags on certain date
- get_field() with ID in one signal filter not working
- i can’t use wordpress functions in ajax loaded php file
- Woocommerce – Switching Price for Category
- Remove External Links from WordPress posts Using add_filter() in Theme functions.php
- Is there any requirements to do socket programming with WordPress?
- Adding A New Widget to WordPress Disables the Existing Widgets
- Slider Thumbnail Size Issue [closed]
- same get_posts function works diffrently in tag.php and functions.php
- Call custom field using php
- Problem in outputting shortcode
- Retrieve array of attachment IDs attached to a given Post ID
- add_theme_support not outputting thumbnails
- How to get tags and categories?
- Archive.php, and post_is_in_descendant_category
- update_user_option not working as expected
- Having problems loading Jquery in functions.php
- How do I access variables outside a function [closed]
- How can I append and prepend something to all post hyperlinks without using ::before or ::after? PHP hook solution?
- Retrieving next_post_link() and previous_post_link() in functions.php
- PHP Notice: Function is_page was called incorrectly. Conditional query tags do not work before the query is run. Before then, they always return false
- How do i set global variable in a function in wordpress functions.php
- Working function() doesn’t execute when triggered by WP CRON