jquery - fputcsv() not including comma in PHP -

i passing array javascript php using ajax , attempting write array new line in csv file. row being appended correctly isn't including necessary closing "," @ end.

$row = $_post['row']; $handle = fopen('filename.csv', 'a'); fputcsv($handle, $row); fclose($handle); 

i've tried messing auto_detect_line_endings no success.

a final , not part of csv spec @ all, unless last field null or empty.

also, fputcsv() expects array of fields. $_post['row'] array of fields? may need translate postdata appropriate array.