Book Image

PHP 7 Data Structures and Algorithms

By : Rahman
5 (1)
Book Image

PHP 7 Data Structures and Algorithms

5 (1)
By: Rahman

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
Table of Contents (14 chapters)

Implementing a stack using PHP array

First, we will create an interface for the stack so that we can use it in different implementations, and can ensure that all implementations have some similarity to each other. Let us write the simple interface for the stack:

interface Stack { 

public function push(string $item);

public function pop();

public function top();

public function isEmpty();

}

As we can see from the preceding interface, we kept all stack functions inside the interface because the class that it is implementing must have all these mentioned functions, otherwise, else a fatal error will be thrown during runtime. Since we are implementing the stack using a PHP array, we are going to use some existing PHP functions for push, pop, and top operations. We are going to implement the stack in such a way that we can define the size of the stack. If there is no...