We have already seen how we can implement a breadth first search (BFS) and a depth first search (DFS) in a tree structure. We will revisit our BFS and DFS for graphs. The difference between a tree implementation and a graph implementation is that in a graph implementation, we can start from any vertex, whereas we start from the root of the tree in a tree data structure. Another important thing to consider is that our graphs can have cycles, which were absent in the tree, so, we cannot revisit a node or vertex as it will end up in an infinite loop. We will use a concept called graph coloring where we keep the status of different node visits with a color or a value to keep it simple. Let's now write some code to implement the BFS and DFS in the graph.
PHP 7 Data Structures and Algorithms
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PHP 7 Data Structures and Algorithms
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Overview of this book
PHP has always been the the go-to language for web based application development, but there are materials and resources you can refer to to see how it works. Data structures and algorithms help you to code and execute them effectively, cutting down on processing time significantly.
If you want to explore data structures and algorithms in a practical way with real-life projects, then this book is for you.
The book begins by introducing you to data structures and algorithms and how to solve a problem from beginning to end using them. Once you are well aware of the basics, it covers the core aspects like arrays, listed lists, stacks and queues. It will take you through several methods of finding efficient algorithms and show you which ones you should implement in each scenario. In addition to this, you will explore the possibilities of functional data structures using PHP and go through advanced algorithms and graphs as well as dynamic programming.
By the end, you will be confident enough to tackle both basic and advanced data structures, understand how they work, and know when to use them in your day-to-day work
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Current Title:
PHP 7 Data Structures and Algorithms
Table of Contents (14 chapters)
Preface
Free Chapter
Introduction to Data Structures and Algorithms
Understanding PHP Arrays
Using Linked Lists
Constructing Stacks and Queues
Applying Recursive Algorithms - Recursion
Understanding and Implementing Trees
Using Sorting Algorithms
Exploring Search Options
Putting Graphs into Action
Understanding and Using Heaps
Solving Problems with Advanced Techniques
PHP Built-In Support for Data Structures and Algorithms
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