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This article mainly explains the "efficiency comparison of file_get_content, curl and fopen functions in php". The explanation in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "the efficiency comparison of file_get_content, curl and fopen functions in php".

Although the three functions are all functions for reading resources, their application scenarios are different.

Curl is mostly used to crawl between Internet web pages, fopen is mostly used to read files, and file_get_contents is mostly used to obtain the content of static pages.

1. Fopen / file_get_contents will re-do the DNS query for each request, and the DNS information will not be cached. However, CURL automatically caches DNS information. Requests for web pages or images under the same domain name need only one DNS query. This greatly reduces the number of DNS queries. So the performance of CURL is much better than fopen / file_get_contents.

2. Fopen / file_get_contents uses http_fopen_wrapper instead of keeplive when requesting HTTP. And curl can. This makes curl more efficient when multiple links are requested multiple times.

3. Curl can simulate a variety of requests, such as POST data, form submission, etc., and users can customize the request according to their own needs. On the other hand, fopen / file_get_contents can only use get to obtain data.

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