How do I export php curl results to a csv file

How do I export the results to a csv file?      Script works fine.  If I echo $buffer2; I get 15000+ rows of data like this:  

 "1162","01/26/15","424.67","24.95","449.62","Overnight","Johnny", "Public","TX","513","1Z07109XXXXXXXXXXXX","01/26/15","116200","4820-XXXX-XXXX-XXXX", "11600"


Thanks for your help!

 Please note:  (Website URL is not shown deliberately....  you would not be able to see it anyway without logging in first.)  

$url2 = 'http://www.website.com/b2b/handleinvoicedownload.php';
	
	
	$fields = array(
	 
	    'delim'=>urlencode('csv'),
		'headerRow'=>urlencode('0'),
	    'startDate'=>urlencode('01/01/2015'),
		'endDate'=>urlencode('01/26/2015'),
		'columndata[1]'=>urlencode('orn'),
		'columndata[2]'=>urlencode('ord'),
		'columndata[3]'=>urlencode('sub'),
		'columndata[4]'=>urlencode('shc'),
		'columndata[5]'=>urlencode('tot'),
		'columndata[6]'=>urlencode('svc'),
		'columndata[7]'=>urlencode('svn'),
		'columndata[8]'=>urlencode('svs'),
		'columndata[9]'=>urlencode('pon'),
		'columndata[10]'=>urlencode('trc'),
		'columndata[11]'=>urlencode('shd'),
		'columndata[12]'=>urlencode('inv'),
		'columndata[13]'=>urlencode('td'),
		'columndata[14]'=>urlencode('null'),
		'columndata[15]'=>urlencode('null'),
		'save'=>urlencode('0'),
		'sumbit.x'=>urlencode('38'),
		'sumbit.y'=>urlencode('16')
		
		);
	


	
	//url-ify the data for the POST
	$fields_string = '';
	foreach($fields as $key=>$value) { $fields_string .= $key.'='.$value.'&'; }
	rtrim($fields_string,'&');
				
	$ch = curl_init(); // initialize curl handle
	curl_setopt($ch, CURLOPT_HEADER, 0);
	curl_setopt($ch, CURLOPT_VERBOSE, 1);
	curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible;)");
	curl_setopt($ch, CURLOPT_AUTOREFERER, false);
	curl_setopt($ch, CURLOPT_CONNECTTIMEOUT,7);
	curl_setopt($ch, CURLOPT_REFERER, 'http://www.website.com/b2b/handleinvoicedownload.php');
	curl_setopt($ch, CURLOPT_URL,$url2); // set url to post to
	curl_setopt($ch, CURLOPT_FAILONERROR, 0);
	curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);// allow redirects
	
	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
	curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookie.txt');
	curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookie.txt');

	curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); // return into a variable
	curl_setopt($ch, CURLOPT_TIMEOUT, 50); // times out after 50s
	curl_setopt($ch,CURLOPT_POST,count($fields));
	curl_setopt($ch,CURLOPT_POSTFIELDS,$fields_string);
	
	
	echo $buffer2 = curl_exec($ch); // run the whole process

	
	if(curl_exec($ch) === false)
	{
	    echo 'Curl error: ' . curl_error($ch);
	    exit;
	}
                    
              

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