About viewing the curl source code of php

After writing the c extension of php, I wanted to check out how to write the source code of other extension libraries, so as to learn how to write it, so I randomly picked a curl commonly used in php to look at it, and the result was in php's ext/ The source code of functions such as curl_setopt() or curl_setopt_array() was not found in the curl directory, but there are definitions of these functions:

It is not in streams.c, but finally I found the definitions of these functions in interface.c Encapsulation: The _php_curl_setopt() function encapsulated in interface.c, curl_setopt() or curl_setopt_array(), etc. all call this function. This function calls the curl_easy_setopt() function of libcurl, so The goal now becomes to find where curl_easy_setopt() is.

Because OS X system should have libcurl, but we can also download a copy of the source code from libcurl’s official website to view. It is different from the libcurl version in OS X system, but it should be roughly the same, so I downloaded this Version: curl-7.40.0 this version.

After searching, I found the function definition. curl_easy_setopt is defined in easy.c:

The above introduces the process of viewing the curl source code of PHP, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.