Answer Wiki:
It sounds like you have the actual comma separated content in a variable which you are able to print to the screen. If all you are looking for is to write that content to a file you can check this tutorial:
The useful code snippet is:
<pre>
$myFile = "testFile.csv";
$fh = fopen($myFile, 'w') or die("can't open file");
$stringData = "one, two, three, four";
fwrite($fh, $stringData);
fclose($fh);
</pre> 
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Maybe you will need to create a array of values and insert into the file instead of sending one by one.
Try the following
class Format { static public function arr_to_csv_line($arr) { $line = array(); foreach ($arr as $v) { $line[] = is_array($v) ? self::arr_to_csv_line($v) : '"' . str_replace('"', '""', $v) . '"'; } return implode(",", $line); } static public function arr_to_csv($arr) { $lines = array(); foreach ($arr as $v) { $lines[] = self::arr_to_csv_line($v); } return implode("n", $lines); } }