Differences between fopen, file_get_contents, and curl functions in PHP

: This article mainly introduces the differences between fopen, file_get_contents, and curl functions in PHP. For more information about PHP tutorials, see. 1. fopen/file_get_contents each request will re-query the DNS and will not cache the DNS information. However, CURL automatically caches DNS information. Only one DNS query is required for a webpage or image request under the same domain name. This greatly reduces the number of DNS queries. Therefore, CURL performance is much better than fopen/file_get_contents.

2. when requesting HTTP, fopen/file_get_contents uses http_fopen_wrapper instead of keeplive. But curl does. In this way, curl is more efficient when multiple links are requested.

3. the fopen/file_get_contents function will be affected by the allow_url_open option configuration in the php. ini file. If this configuration is disabled, the function becomes invalid. Curl is not affected by this configuration.

4. curl can simulate multiple requests, such as POST data and form submission. you can customize the requests as needed. Fopen/file_get_contents can only get data.
When file_get_contents obtains a remote file, it stores all the results in a string. the fiels function is saved as an array.

In general

File_get_contents is nice to use when the processing frequency is small. No exception. If your file is processed by more than 1 k users. So your server cpu is waiting for a high upgrade. Therefore, we recommend that you use the curl Library when writing php code in the future.

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The above introduces the differences between fopen, file_get_contents, and curl functions in PHP, including some content. I hope to help my friends who are interested in PHP tutorials.