PHP implements multi-threaded crawling based on curl
This article mainly introduces PHP to implement multi-threaded crawling based on curl. Interested friends can refer to it. I hope it will be helpful to everyone.
PHP can use Curl to complete various file transfer operations, such as simulating a browser to send GET, POST requests, etc. However, because the PHP language itself does not support multi-threading, the efficiency of developing crawler programs is not high, so it is often You need to use the Curl Multi Functions function to achieve concurrent multi-threaded access to multiple url addresses to achieve concurrent multi-threaded crawling of web pages or downloading files.
The code is as follows:
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Let’s look at a few more examples
(1) The following code is to capture multiple URLs, and then write the page code of the captured URLs into the specified file
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(2) The following code and The above is almost the same, except that this place puts the obtained code into the variable first, and then writes the obtained content to the specified file
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(3) The following code is implemented using PHP Curl Functions implements concurrent multi-threaded downloading of files
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Summary:The above is the entire content of this article, I hope it will be helpful to everyone's learning.
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