Understand PHP data structures and algorithms

PHP is a scripting language widely used in web development and is getting better and better at building dynamic websites. In Web development, data structures and algorithms are no less important than other programming categories, and their impact on program running efficiency is particularly significant. Especially in scenarios involving large amounts of data storage and processing, or high program performance requirements, data structures and algorithms have become a part that cannot be ignored. This article mainly introduces some commonly used data structures and algorithms in PHP.

1. Data structure

1. Array

PHP array is a very common data structure that is simple to understand and easy to apply in development. It stores data in the form of a collection of scattered variables, and its elements can be quickly accessed and modified.

2. Linked list

The linked list is a linear storage structure. Compared with the array, the linked list can dynamically add and delete elements. In PHP, a linked list can be represented by defining a class of linked list nodes.

3. Stack

The stack is a first-in, last-out linear storage structure that is often used in expression calculations, depth-first search and other scenarios.

4. Queue

Queue is a first-in-first-out linear structure, often used in algorithms such as breadth-first search.

2. Algorithm

1. Sorting algorithm

Sorting algorithm is one of the most basic algorithms. Here is a brief introduction to several commonly used sorting algorithms.

①Bubble sorting

The principle of bubble sorting is to compare adjacent elements in sequence, exchange positions, and push the maximum value to the end of the queue.

②Selection sorting

The principle of selection sorting is to select a minimum value among the unsorted elements, and then exchange the position of the minimum value with the first element of the unsorted part.

③Insertion sort

The principle of insertion sort is to assume that the previous elements are sorted and insert new elements into the correct position in the sorted sequence.

2. Search algorithm

Search algorithm is also a classic problem in computer science, taking binary search as an example.

①Binary search

Binary search is a comparison-based search algorithm, suitable for ordered lists or arrays.

3. Hash algorithm

The hash algorithm is a technology that applies a function to data and can map data of any length into a fixed-length hash value. .

The above only lists some common data structures and algorithms. In fact, there are many other data structures and algorithms in PHP, which developers can use flexibly according to specific needs. All in all, mastering data structures and algorithms is extremely important for PHP development. It can help programmers effectively improve the function and performance of the program, and at the same time, it can also deepen the understanding and knowledge of programming.

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