Nggiahao/crawler, how to create a web crawler using php

Today, I’m going to lớn introduce ways lớn crawl a website with PHP. There are many ways to crawl a webpage, JSON, XML, and other data. We using PHP to bởi this.

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How to crawl a web page?What’s web Scraping?

Web Scraping (also termed Screen Scraping, web Data Extraction, website Harvesting etc.) is a technique employed to lớn extract large amounts of data from websites whereby the data is extracted and saved khổng lồ a local file in your computer or to lớn a database in table (spreadsheet) format.

Web scraping, web harvesting, or web data extraction is data scraping used for extracting data from websites. Web scraping software may access the World Wide website directly using the Hypertext Transfer Protocol, or through a web browser. While web scraping can be done manually by a software user, the term typically refers lớn automated processes implemented using a bot or website crawler. It is a khung of copying, in which specific data is gathered và copied from the web, typically into a central local database or spreadsheet, for later retrieval or analysis.

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crawling with simple HTML DOM parser

PHP Simple HTML DOM Parser adaptation for Composer and PSR-0. For using this way, you should use this package:

Version 1.5.2 Adaptation for Composer và PSR-0 of A HTML DOM parser is written in PHP5+ let you manipulate HTML in a…

Install with the composer:

composer install sunra/php-simple-html-dom-parserUsage:

use SunraPhpSimpleHtmlDomParser;$url = "";// get html from URL$dom = HtmlDomParser::str_get_html($url);// get all images on$imagesElements = $dom->find('img');foreach ($imagesElements as $imagesElement) $images = $imagesElement->getAttribute('src');// get meta og:image on$metaElements = $dom->find("metaproperty='og:image'>");foreach ($metaElements as $metaElement) $images = $metaElement->getAttribute('href');For more information about simple HTML DOM parser, read this documentation:

Crawling with Goutte

Goutte is a screen scraping and web crawling library for PHP.

Goutte provides a nice API khổng lồ crawl websites và extract data from the HTML/XML responses.

Goutte is a screen scraping và web crawling library for PHP. Goutte provides a nice API to crawl websites & extract…

Install with the composer:

composer require fabpot/goutteUsage:

use GoutteClient;$client = new Client();// get html from URL$crawler = $client->request('GET', '');// get all images on$crawler->filter('img')->each(function ($node) print $node->attr('src')." ";);For more information about Goutte, read this documentation:

Compare Goutte và simple HTML DOM parser

You can see the difference between the two ways & choose a better one.