PHP infinite classification tree class method

13 Dec 2025

This article aims to solve the problem of infinite generation traversal and counting of family trees (or other hierarchical structures) in PHP. By analyzing the limitations of fixed-depth loops, the article details how to use recursive ideas to build a function that can handle any depth hierarchical structure. The content covers the core principles of recursive functions, the basic situation and the construction of recursive steps, PHP code implementation and key point analysis, and provides performance considerations and precautions to help developers achieve efficient and flexible hierarchical data processing.

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.