Summary of common methods for crawling web pages and parsing HTML with PHP, PHP crawling_PHP tutorial

Summary of common methods for PHP to crawl web pages and parse HTML, PHP crawling

Overview

Crawler is a function that we often encounter when making programs. PHP has many open source crawler tools, such as snoopy. These open source crawler tools can usually help us complete most of the functions, but in some cases, we need to implement a crawler ourselves. This article explains how to implement crawlers in PHP a summary.

Main methods of implementing crawler in PHP

1.file() function
2.file_get_contents() function
3.fopen()->fread()->fclose() method
4.curl method
5.fsockopen() function, socket mode
6. Use open source tools, such as: snoopy

Main ways for PHP to parse XML or HTML

1. Regular expression
2.PHP DOMDocument object
3. Plug-ins, such as: PHP Simple HTML DOM Parser

Summary

Here is a brief summary of the way PHP implements crawlers. There is a lot more content in this article. Later, we will make a summary of the way PHP parses HTML and XML.