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Example code of nadar/crawler

Informations about the package crawler

Website Crawler for PHP

Tests Test Coverage Maintainability Packagist Downloads

A highly extendible, dependency free Crawler for HTML, PDFS or any other type of Documents.

Why another Page Crawler? Yes, indeed, there are already very good Crawlers around, therefore those where my goals:

Installation

Composer is required to install this library:

In order to use the PDF Parser, the optional library smalot/pdfparser must be installed:

Usage

  1. First we need to provide the crawler the information what should be done with the results from a crawler run:

Create your handler, those are the classes which interact with the crawler in order to store your content/results somwehere. The afterRun() method will run whenever an URL is crawled and contains the results:

  1. Then we attach the handler and setup all required informations for crawler:

Attention: Keep in mind that wen you enable the PDF Parser and have multiple concurrent requests this can drastically increases memory usage (Especially if there are large PDFs)! Therefore it's recommend to lower the concurrent value when enabling PDF Parser!

Benchmark

Of course those benchmarks may vary depending on internet connection, bandwidth, servers but we made all the tests under the same circumstances. The memory peak varys strong when using the PDF parsers, therefore we test only with HTML parser:

Index Size Concurrent Requests Memory Peak Time Storage
308 30 6MB 19s ArrayStorage
308 30 6MB 20s FileStorage

Still looking for a good website to use for benchmarking. See the benchmark.php file for the test setup.

Developer Informations

For a better understanding, here is en explenation of how the classes are capsulated and for what they are used.

Lifecycle

Crawler -> Job -> (ItemQueue -> Storage) -> RequestResponse -> Parser -> ParserResult -> Result

All versions of crawler with dependencies

PHP Build Version
Package Version
Requires ext-curl Version *
Composer command for our command line client (download client) This client runs in each environment. You don't need a specific PHP version etc. The first 20 API calls are free. Standard composer command

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