Description:
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From manual page: http://www.php.net/function.curl-setopt
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CURLOPT_COOKIEFILE accepts an empty string "" as parameter to load no cookies but enable cookie handling. This is documented e.g. here: http://curl.haxx.se/libcurl/c/curl_easy_setopt.html

> Given an empty or non-existing file or by passing the empty string (""), this option will enable cookies for this curl handle, making it understand and parse received cookies and then use matching cookies in future requests. 

Suggested patch to command description:

The name of the file containing the cookie data. The cookie file can be in Netscape format, or just plain HTTP-style headers dumped into a file.
If the name is an empty string, no cookies are loaded, but cookie handling is still enabled.

Test script:
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Have 100 random php coders read the manpage and ask them to figure out how to enable cookie handling.

Expected result:
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I expect most to come up with "no idea" or "Uhh.. someone wrote I could use /dev/null"