File in PHP

This article shares some of the comparisons in PHP about the performance efficiencies of file_get_contents in curl. The content of the article from the network, if there is not the correct place, can be timely message added correction.

(1) Fopen/file_get_contents every time the data in the remote URL is requested to do the DNS query again, and the DNS information is not cached. However, Curl will automatically cache DNS information. Requests for a Web page or picture under the same domain name require only a single DNS query. This greatly reduces the number of DNS queries. So curl performance is much better than fopen/file_get_contents.

(2) Fopen/file_get_contents when HTTP is requested, the use of Http_fopen_wrapper, will not keeplive. and curl can. This makes curl more efficient when multiple links are requested more than once. (Set header header should be OK)

(3) The Fopen/file_get_contents function is affected by the configuration of the Allow_url_open option in the php.ini file. If the configuration is turned off, the function is invalidated. The curl is not affected by this configuration.

(4) Curl can simulate a variety of requests, such as post data, form submission, etc., users can customize the request according to their own needs. Fopen/file_get_contents can only obtain data using GET.

(5) fopen/file_get_contents cannot download binary files correctly.

(6) Fopen/file_get_contents cannot handle SSL requests properly.

(7) Curl can use multithreading.

(8) When using file_get_contents, if there is a problem with the network, it is easy to accumulate some process here.

(9) If you want to make a continuous connection, request multiple pages more than once. Then file_get_contents will go wrong. The contents may also be incorrect. So when doing some similar collection work, using curl as a substitute is a relatively correct choice.

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