How to use PHP and phpSpider to complete data crawling with form interaction?

How to use PHP and phpSpider to complete data crawling with form interaction?

Introduction:
Data crawling plays a very important role in today's Internet era. Data crawling technology can be used to quickly obtain a large amount of data on the Internet, and these data can be processed, analyzed and applied. . phpSpider is a powerful PHP open source crawler tool that can help us crawl data quickly and flexibly. This article will introduce how to use PHP and phpSpider to complete data crawling with form interaction, and provide detailed code examples.

1. Introduction to phpSpider
phpSpider is a distributed crawler framework based on PHP. It combines multi-process, multi-threading and non-blocking I/O technologies to efficiently crawl web pages and data. parse. phpSpider also provides rich functions and flexible configuration options to meet various crawling needs.

2. Preparation work
Before using phpSpider to crawl data, you need to install the PHP environment and configure related dependency extensions. In addition, you also need to download the source code of phpSpider and extract it to the project directory. The following takes the CentOS system as an example:

1. Install PHP and configure related extensions

   $ sudo yum install php
   $ sudo yum install php-mbstring
   $ sudo yum install php-xml

2. Download the source code of phpSpider

   $ wget https://github.com/owner888/phpspider/archive/master.zip
   $ unzip master.zip

3. Writing a crawler script
Before starting to write a crawler script, you first need to determine the target website to be crawled, and analyze the page structure and form interaction method of the website. This article takes a simple sample website as an example to crawl the form data on the website.

1. Create a new PHP file, named spider.php, and add the following code in the file:

   <?php
   require_once 'vendor/autoload.php';
   
   use phpspidercorephpspider;
   use phpspidercoreequests;
   use phpspidercoreselector;
   
   // 设置爬虫的配置信息
   $configs = array(
    'name' => 'MySpider',
    'tasknums' => 1,
    'log_show' => false,
    'log_file' => 'data/log.txt',
    'domains' => array(
        'example.com'
    ),
    'scan_urls' => array(
        'http://example.com'
    ),
    'list_url_regexes' => array(
        'http://example.com/list'
    ),
    'content_url_regexes' => array(
        'http://example.com/content/d+'
    ),
    'fields' => array(
        array(
            'name' => 'title',
            'selector' => 'h1',
            'required' => true
        ),
        array(
            'name' => 'content',
            'selector' => '.content',
            'required' => true
        )
    )
   );
   
   // 创建爬虫实例
   $spider = new phpspider($configs);
   
   // 处理列表页
   $spider->on_scan_page = function ($page, $content, $phpspider) {
    $urls = selector::select($content, '//a[@class="page-link"]/@href');
    foreach ($urls as $url) {
        $url = 'http://example.com' . $url;
        $phpspider->add_url($url);
    }
   };
   
   // 处理内容页
   $spider->on_extract_page = function ($page, $data) {
    return $data;
   };
   
   // 启动爬虫
   $spider->start();

2. Run the crawler script

   $ php spider.php

4. Summary
Through the above steps, we can use PHP and phpSpider to complete data crawling with form interaction. First, we need to download and install phpSpider, then write the crawler script and set relevant configuration information for the crawler. In the crawler script, we need to define how to process the list page and content page, and specify the fields to crawl. Finally, we can run the crawler script, and phpSpider will automatically crawl the data and save the results to the specified file.

In short, phpSpider is a powerful and easy-to-use PHP crawler framework that can help us crawl data quickly and efficiently. I hope the introduction and examples in this article can help everyone achieve success in practical applications.

(Note: The above is a simplified example, the specific code and configuration need to be adjusted and improved according to the actual situation.)

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