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If the 2nd parameter is...
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3rd parameter should be...
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CURLOPT_COOKIE
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String containing the contents of the cookie data to be set in the HTTP header.
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CURLOPT_COOKIEFILE
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String containing the name of the file containing cookie data to be sent.
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CURLOPT_CRLF
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1 if you want Curl to convert Unix new lines to CR/LF new lines
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CURLOPT_FAILONERROR
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1 if you want Curl to fail silently if the HTTP code returned is equal to or larger than 300.
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CURLOPT_FILE
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String containing the filename where the output of your transfer should be placed. Default is straight to output (STDOUT).
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CURLOPT_FOLLOWLOCATION
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1 if you want Curl to follow all "Location: " header that the server sends as part of the HTTP header. You can limit the number of location headers to follow using CURLOPT_MAXREDIRS.
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CURLOPT_FTPAPPEND
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1 to have Curl append to the remote file instead of overwriting it.
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CURLOPT_FTPLISTONLY
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1 to list just the names of an FTP directory as opposed to more detailed information.
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CURLOPT_HEADER
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1 if you want the header to be included in the output. Usually for HTTP only.
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CURLOPT_HTTPHEADER
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An array of HTTP header fields to be set.
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CURLOPT_INFILE
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String containing the filename where the input of your transfer comes from.
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CURLOPT_INFILESIZE
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The size of the file being uploaded to a remote site.
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CURLOPT_MAXREDIRS
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The number of "Location:" headers Curl should follow before erroring out. This option is only appropriate if CURLOPT_FOLLOWLOCATION is used also.
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CURLOPT_NOBODY
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1 to tell Curl not to include the body part in the output. For HTTP(S) servers, this is equivalent to a HEAD request - only the headers will be returned.
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CURLOPT_POST
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1 if you want Curl to do a regular HTTP POST.
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CURLOPT_POSTFIELDS
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A string containing the data to post in the HTTP "POST" operation.
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CURLOPT_REFERER
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A string containing the "referer" header to be used in an HTTP request. This is only necessary if the remote server relies on this value.
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CURLOPT_RESUME_FROM
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A number equal to the offset, in bytes, that you want your transfer to start from.
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CURLOPT_RETURNTRANSFER
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1 if you want Curl to return the transfer data instead of printing it out directly.
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CURLOPT_STDERR
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A string containing the filename to write errors to instead of normal output.
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CURLOPT_TIMEOUT
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A number equal to the maximum time in seconds that Curl functions can take.
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CURLOPT_UPLOAD
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1 if you want PHP to prepare for a file upload.
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CURLOPT_URL
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String containing the URL you want Curl to fetch.
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CURLOPT_USERPWD
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A string formatted in the username:password manner, for Curl to give to the remote server if requested.
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CURLOPT_USERAGENT
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A string containing the "user-agent" header to be used in a HTTP request.
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CURLOPT_VERBOSE
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1 if you want Curl to give detailed reports about everything that is happening.
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CURLOPT_WRITEHEADER
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containing the filename to write the header part of the output into.
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As you can see there are quite a few headers, and those are only the most popular - there is a large selection more available online at http://curl.haxx.se/libcurl/c/curl_easy_setopt.html.
