Course Introduction：This tutorial aims to resolve the "Undefined index: link" error encountered when trying to get and display the classification link in the PrestaShop 1.7 custom module. We will explain in detail how to use PrestaShop's Link class to pass link objects to the Smarty template in the backend PHP code, and call the getCategoryLink method correctly in the frontend template to dynamically generate a classification URL to ensure the correctness and accessibility of the link.
2025-08-20 comment 0 327
Course Introduction：This tutorial details how to correctly obtain and display the classification link in the PrestaShop 1.7 custom module, and resolves the common error of "Undefined index: link" after using the Category::getNestedCategories method. The article will guide you how to use PrestaShop's Link class to assign link objects to Smarty templates in PHP code, and dynamically generate classified URLs through the getCategoryLink method in the template to ensure the accuracy and maintainability of the link.
2025-08-21 comment 0 645
Course Introduction：Use multi-dimensional arrays and recursive functions to effectively process hierarchical data in PHP. First, build flat data into a tree structure. 1. Recursively organize parent-child relationships through the buildTree function; 2. Recursively generate nested HTML lists using the renderTree function; 3. Use helper functions such as findNodeById to search nodes; 4. Pay attention to the recursive performance overhead, cache the tree structure or use iterative methods when necessary, so as to efficiently implement traversal, rendering and query. This method is suitable for classification, menu and other scenarios, and is a flexible and practical solution.
2025-08-07 comment 0 349
Course Introduction：SqlParameter Parameters.Add vs. AddWithValue: Choosing the Best MethodWhen working with SQL commands, you may encounter the need to add...
2025-01-10 comment 0 736
Course Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w
2025-01-10 comment 0 934
Course Elementary 13927
Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.
Course Elementary 82482
Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).
Course Elementary 13265
Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.
Course Elementary 24731
Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.
Course Elementary 27566
Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.
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