php Courses

Apr 9, 2025 · Fundamentals

Pre-order Traversal in PHP: Recursive, Iterative, and Interactive Implementations

This article explains the concept of pre-order (root-left-right) tree traversal, demonstrates how to represent binary trees in PHP, provides recursive and stack‑based iterative implementations, and includes an interactive script that lets users build a tree and choose traversal methods, with full example code.