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add_meta_box() – Adds a meta box to one or more screens. WP Function.
add_meta_box() – Adds a meta box to one or more screens. WP Function.

php - Wordpress Plugin Dev : Fatal error: Call to undefined function add_action() - Stack Overflow
php - Wordpress Plugin Dev : Fatal error: Call to undefined function add_action() - Stack Overflow

How to Create Custom WordPress Write/Meta Boxes
How to Create Custom WordPress Write/Meta Boxes

tatiyants.com Use WordPress Custom Post Types to Add Events to Your Site
tatiyants.com Use WordPress Custom Post Types to Add Events to Your Site

How to fix “Call to undefined function add_meta_box()” in WordPress | Badjak Bukan Sembarang Badjak
How to fix “Call to undefined function add_meta_box()” in WordPress | Badjak Bukan Sembarang Badjak

tatiyants.com Use WordPress Custom Post Types to Add Events to Your Site
tatiyants.com Use WordPress Custom Post Types to Add Events to Your Site

Managing WordPress Metadata in Gutenberg Using a Sidebar Plugin | CSS-Tricks - CSS-Tricks
Managing WordPress Metadata in Gutenberg Using a Sidebar Plugin | CSS-Tricks - CSS-Tricks

How to fix Fatal error: Call to undefined function mb_split() - TestingDocs.com
How to fix Fatal error: Call to undefined function mb_split() - TestingDocs.com

How To Fix Call To Undefined Function Error in WordPress | Tutorial - YouTube
How To Fix Call To Undefined Function Error in WordPress | Tutorial - YouTube

add_meta_box() – Adds a meta box to one or more screens. WP Function.
add_meta_box() – Adds a meta box to one or more screens. WP Function.

Custom fields - Meta Box Documentation
Custom fields - Meta Box Documentation

php - "Call to undefined function" in WordPress - Stack Overflow
php - "Call to undefined function" in WordPress - Stack Overflow

Fatal error: Call to undefined function field_attach_load() in includes/entity.inc on line 321 during install [#481758] | Drupal.org
Fatal error: Call to undefined function field_attach_load() in includes/entity.inc on line 321 during install [#481758] | Drupal.org

Extending Custom Post Types in WordPress 3.0 - Konstantin Kovshenin
Extending Custom Post Types in WordPress 3.0 - Konstantin Kovshenin

How to add a Metabox. A step by step approach. add_meta_box — What about WordPress
How to add a Metabox. A step by step approach. add_meta_box — What about WordPress

How to add a Metabox. A step by step approach. add_meta_box — What about WordPress
How to add a Metabox. A step by step approach. add_meta_box — What about WordPress

How to Add a Metabox to a Custom Post Type | WP Theming
How to Add a Metabox to a Custom Post Type | WP Theming

How to add a Metabox. A step by step approach. add_meta_box — What about WordPress
How to add a Metabox. A step by step approach. add_meta_box — What about WordPress

metabox - add_meta_box does not go 'side' - WordPress Development Stack Exchange
metabox - add_meta_box does not go 'side' - WordPress Development Stack Exchange

Why am I getting "Call to undefined function add_meta_box()" ?? - WPQuestions
Why am I getting "Call to undefined function add_meta_box()" ?? - WPQuestions

Wordpress: Call to undefined function wp_embed_register_handler() - Stack Overflow
Wordpress: Call to undefined function wp_embed_register_handler() - Stack Overflow

themes - Creating custom meta box throws PHP warning error in WordPress - WordPress Development Stack Exchange
themes - Creating custom meta box throws PHP warning error in WordPress - WordPress Development Stack Exchange

php - Error in adding extra meta box for woocommerce - Stack Overflow
php - Error in adding extra meta box for woocommerce - Stack Overflow

php - Fatal error: Uncaught Error: Call to undefined function get_header() - WordPress Development Stack Exchange
php - Fatal error: Uncaught Error: Call to undefined function get_header() - WordPress Development Stack Exchange