SEARCH register.custom_metabox / Utility / register.custom_metabox By Amit Singh. Posted on March 02, 2020 It will allow you to quickly register metaboxes. Last Modified By Amit Singh. Categories Arrays Caching Conditionals Core CRM Database Debugging Ecommerce Excelsheet Mailing & SMS MySQL Multi Queries PDF Script and Style Social Utility WordPress Most Popular if.whitespace if.else query.insert_comment query.add_non_unique_post_meta request.get