php+mysql database unlimited classification library

12 Jul 2016

PHP MySQL method to implement unlimited classification columns. PHP MySQL's method of implementing unlimited classification columns. This article describes the method of PHP MySQL's implementation of unlimited classification columns. Share it with everyone for your reference, the details are as follows: A very simple

04 Feb 2026

This article explains in detail how to flexibly define and query self-associated one-to-many relationships at different levels (such as main category → superior category, upper category → secondary category, etc.) based on the category_type and parent_category fields in Laravel's single Category model.

12 Jul 2016

Get the number of articles under a specified category and its subcategories in WordPress, the number of WordPress articles. Get the number of articles under a specified category and its subcategories in WordPress. Number of WordPress articles. Get the number of articles in a specific category. Sometimes we want to get the number of articles under a certain category (category).

03 Apr 2026

This article explains in detail how to accurately obtain and display the direct subcategories of the current category in the WooCommerce product category archive page, while safely outputting the intercepted category description to avoid misrepresentation of the entire site category or undefined variable errors.

29 Jan 2026

This article describes how to merge the selected values ​​into a single comma-separated string (e.g. product-category=29,27) when handling multiple checkboxes with the same name (e.g. name="product-category") in jQuery AJAX, instead of the default repeated key format (product-category=29&product-category=27).

18 Feb 2026

This article describes how to use WordPress’s get_posts() function to accurately obtain all published articles under a specified category through category names (rather than IDs), and generate a front-end display structure with category name titles and article links.