Description:
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From manual page: http://www.php.net/curl.configuration
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This page makes this claim "This extension has no configuration directives defined in php.ini.", however looking at the source code I found an undocumented directive "curl.cainfo" which allowed me to specify a valid certificate bundle (had problems with zend server CE).

I was trying to hack the curl extension to set CURLOPT_CAINFO but I didn't have to thanks to this piece of code:

        cainfo = INI_STR("curl.cainfo");
        if (cainfo && strlen(cainfo) > 0) {
                curl_easy_setopt(ch->cp, CURLOPT_CAINFO, cainfo);
        }


It might help others if this directive is documented, thank you!