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https://github.com/mvdbos/php-spider

A configurable and extensible PHP web spider
https://github.com/mvdbos/php-spider

Last synced: 18 days ago
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A configurable and extensible PHP web spider

Lists

README 

        
![Build Status](https://github.com/mvdbos/php-spider/workflows/PHP-Spider/badge.svg?branch=master)

[![Latest Stable Version](https://poser.pugx.org/vdb/php-spider/v)](https://packagist.org/packages/vdb/php-spider)

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PHP-Spider Features

======

- supports two traversal algorithms: breadth-first and depth-first

- supports crawl depth limiting, queue size limiting and max downloads limiting

- supports adding custom URI discovery logic, based on XPath, CSS selectors, or plain old PHP

- comes with a useful set of URI filters, such as robots.txt and Domain limiting

- supports custom URI filters, both prefetch (URI) and postfetch (Resource content)

- supports custom request handling logic

- supports Basic, Digest and NTLM HTTP authentication. See [example](example/example_basic_auth.php).

- comes with a useful set of persistence handlers (memory, file)

- supports custom persistence handlers

- collects statistics about the crawl for reporting

- dispatches useful events, allowing developers to add even more custom behavior

- supports a politeness policy



This Spider does not support Javascript.



Installation

------------

The easiest way to install PHP-Spider is with [composer](https://getcomposer.org/).  Find it on [Packagist](https://packagist.org/packages/vdb/php-spider).



```bash

$ composer require vdb/php-spider

```



Usage

-----

This is a very simple example. This code can be found in [example/example_simple.php](example/example_simple.php). For a more complete example with some logging, caching and filters, see [example/example_complex.php](example/example_complex.php). That file contains a more real-world example.



>> Note that by default, the spider stops processing when it encounters a 4XX or 5XX error responses. To set the spider up to keep processing, please see [the link checker example](https://github.com/mvdbos/php-spider/blob/master/example/example_link_check.php). It uses a custom request handler, that configures the default Guzzle request handler to not fail on 4XX and 5XX responses. 



First create the spider

```php

$spider = new Spider('http://www.dmoz.org');

```

Add a URI discoverer. Without it, the spider does nothing. In this case, we want all `` nodes from a certain `
`



```php

$spider->getDiscovererSet()->set(new XPathExpressionDiscoverer("//div[@id='catalogs']//a"));

```

Set some sane options for this example. In this case, we only get the first 10 items from the start page.



```php

$spider->getDiscovererSet()->maxDepth = 1;

$spider->getQueueManager()->maxQueueSize = 10;

```

Add a listener to collect stats from the Spider and the QueueManager.

There are more components that dispatch events you can use.



```php

$statsHandler = new StatsHandler();

$spider->getQueueManager()->getDispatcher()->addSubscriber($statsHandler);

$spider->getDispatcher()->addSubscriber($statsHandler);

```

Execute the crawl



```php

$spider->crawl();

```

When crawling is done, we could get some info about the crawl

```php

echo "\n  ENQUEUED:  " . count($statsHandler->getQueued());

echo "\n  SKIPPED:   " . count($statsHandler->getFiltered());

echo "\n  FAILED:    " . count($statsHandler->getFailed());

echo "\n  PERSISTED:    " . count($statsHandler->getPersisted());

```

Finally we could do some processing on the downloaded resources. In this example, we will echo the title of all resources

```php

echo "\n\nDOWNLOADED RESOURCES: ";

foreach ($spider->getDownloader()->getPersistenceHandler() as $resource) {

    echo "\n - " . $resource->getCrawler()->filterXpath('//title')->text();

}



```

Contributing

------------

Contributing to PHP-Spider is as easy as Forking the repository on Github and submitting a Pull Request.

The Symfony documentation contains an excellent guide for how to do that properly here: [Submitting a Patch](http://symfony.com/doc/current/contributing/code/patches.html#step-1-setup-your-environment).



There a few requirements for a Pull Request to be accepted:

- Follow the coding standards: PHP-Spider follows the coding standards defined in the [PSR-0](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-0.md), [PSR-1](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-1-basic-coding-standard.md) and [PSR-2](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md) Coding Style Guides;

- Prove that the code works with unit tests and that coverage remains 100%;



> Note: An easy way to check if your code conforms to PHP-Spider is by running the script `bin/static-analysis`, which is part of this repo. This will run the following tools, configured for PHP-Spider: PHP CodeSniffer, PHP Mess Detector and PHP Copy/Paste Detector.  



> Note: To run PHPUnit with coverage, and to check that coverage == 100%, you can run `bin/coverage-enforce`.



Support

-------

For things like reporting bugs and requesting features it is best to create an [issue](https://github.com/mvdbos/php-spider/issues) here on GitHub. It is even better to accompany it with a Pull Request. ;-)



License

-------

PHP-Spider is licensed under the MIT license.