Online PHP editor | output for 2ngJ2

<?php $file = "2016/11/2 23:49:34,1,2,3,5 <---Array 0 2016/11/2 23:49:35,2,2,3,9 <---Array 1 2016/11/2 23:49:36,0,2,3,5 <---Array 2 2016/11/2 23:49:37,0,5,3,5 <---Array 3 2016/11/2 23:49:38,0,2,3,5 <---Array 4 2016/11/2 23:49:39,1,2,3,5 <---Array 5 2016/11/2 23:49:40,2,2,3,5 <---Array 6 2016/11/2 23:49:41,3,2,3,5 <---Array 7 2016/11/2 23:49:42,4,2,3,5 <---Array 8 2016/11/2 23:49:43,5,2,7,5 <---Array 9 2016/11/2 23:49:44,0,2,3,5 <---Array 10 2016/11/2 23:49:45,0,2,3,5 <---Array 11 2016/11/2 23:49:46,0,3,5,7 <---Array 12"; // $file = file_get_contents('temp.txt'); $rows = explode("\n", $file); $i = 0; $sum = 0; foreach($rows as $row) { //get row data $row_data = explode(',', $row); $data = $row_data[1]; if($data == 0){ $sum = $sum + $PrevRow; } $PrevRow = $data; $i++; } echo $sum;