How to write a web crawler in PHP

Octopus Collector is an Internet data collector that can be easily used without programming and knowledge. If you want to write a web crawler using PHP, you can refer to the following steps:1

Learn PHP basics: Before writing a web crawler, it is recommended that you first learn the basics of PHP, including syntax, variables, arrays, loops, conditional statements, etc. 3.

Use PHP's network request library: PHP provides multiple network request libraries, such as curl, guzzle, etc., you can choose one of the libraries to send HTTP requests and get web content. 4.

Parse web content: After obtaining the web content, you need to use methods such as PHP's string processing functions or regular expressions to parse the web content and extract the required data. 5.

Store data: After you parse the content of a web page, you can choose to save the data to a database, file, or other storage medium. Please note that using PHP to write a web crawler requires a certain programming foundation and network knowledge, as well as compliance with relevant laws and regulations and the rules of use.

If you are new to programming or need a quicker, easier way to collect data, we recommend using an Octopus Collector. The Octopus Collector provides a simple and easy-to-understand operation interface and rich functions, which can easily carry out data acquisition without programming and knowledge. Octopus has prepared a series of concise and easy-to-understand tutorials for users to help you quickly master the collection skills and easily deal with all kinds of ** data collection, please go to the official website tutorial and help for more details.

You should be able to write it by looking at php curl.

As far as I know, a lot of third libraries can implement these PHP crawler features that you're asking for.

Such as phpquery, phpcrawl, phpspider, snoopy.

It's also pretty good to use curl to make Lee trapped. But there's so much more you have to do. It only bears the posture responsibility request and **, and does not implement the core of the crawler. Everything else has to be done yourself, at least you have to wrap it up first.

If you have a more urgent task, it is recommended to choose those third-party libraries, integrate them, and use them first.

It's better to know all aspects of crawlers during business time.

xpath is simple, get the source code, give it to phpquery, just like using jquery, no regular needs to be used. There are also some that need to be dynamically rendered to get the data, and you have to use a headless browser, such as phantomjs, to handle it.

Speed won't be a problem, and it's a problem because it's too fast, and it's discovered and then blocked by **, not too slow. Ha ha.

Personally, I think the more difficult thing is how to target the anti-crawler strategy and how to fully automate. It is still advisable to read a few books about crawlers.