php Num rows of stored procedure MySQL - php

Question

I have a stored procedure in MySQL. I call my procedure in php as
$qry = $mysqli->prepare("CALL seen_table()");
i tried to get the resulting rows by
$row = $qry->num-rows;
but its resulting 0 even there is a resulting set.Then I tried also to put output parameter in my procedure where in inside of my proc is ...
SELECT COUNT(*) INTO cnt FROM TBL
...then this is my codes
$qry = $mysqli->prepare("CALL seen_table(#cnt)");
$qry1 = $mysqli->query("SELECT #cnt");
$row = $qry1->num_rows;
then now its always results 1 even there is no count. when i try to execute CALL and SELECT #cnt in Mysql . if there is no count. the result will be
|#cnt|
|(null)|
does null really count as one?please help. thanks a lot.
EDIT: Added seen_table Procedure codes
DELIMITER $$
USE `xiroosco_mundoxiro`$$
DROP PROCEDURE IF EXISTS `seen_table`$$
CREATE DEFINER=`xiroosco`#`103.16.170.%` PROCEDURE `seen_table`(bound
VARCHAR(255),IN cmntId INT,IN cmntViewID VARCHAR(255),OUT viewCNT INT)
BEGIN
DECLARE seen_ID INT DEFAULT 0;
DECLARE seen_notifica_ID INT DEFAULT 0;
DECLARE seen_viewers TEXT;
DECLARE occurance INT DEFAULT 0;
DECLARE i INT DEFAULT 0;
DECLARE splitted_value INT;
DECLARE done INT DEFAULT 0;
DECLARE cur1 CURSOR FOR SELECT seen.seen_ID, seen.seen_notifica_ID,
seen.seen_viewers
FROM seen
WHERE seen.seen_notifica_ID = cmntId;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
DROP TEMPORARY TABLE IF EXISTS seen2;
CREATE TEMPORARY TABLE seen2(
`seen_ID` INT NOT NULL,
`seen_notifica_ID` INT NOT NULL,
`seen_viewers` VARCHAR(255) NOT NULL
) ENGINE=MEMORY;
OPEN cur1;
read_loop: LOOP
FETCH cur1 INTO seen_ID,seen_notifica_ID, seen_viewers;
IF done THEN
LEAVE read_loop;
END IF;
SET occurance = (SELECT LENGTH(seen_viewers) -
LENGTH(REPLACE(seen_viewers, bound, '')) +1);
SET i=1;
WHILE i <= occurance DO
SET splitted_value = (SELECT
REPLACE(SUBSTRING(SUBSTRING_INDEX(seen_viewers, bound, i),
LENGTH(SUBSTRING_INDEX(seen_viewers, bound, i - 1)) + 1), ',', ''));
INSERT INTO seen2 VALUES (seen_ID,seen_notifica_ID, splitted_value);
SET i = i + 1;
END WHILE;
END LOOP;
IF cmntViewID = "*" THEN
SELECT * FROM seen2 GROUP BY seen2.seen_viewers;
SELECT COUNT(*) INTO viewCNT FROM seen2;
ELSE
SELECT * FROM seen2 WHERE seen2.seen_viewers = cmntViewID GROUP BY
seen2.seen_viewers;
SELECT seen_ID INTO viewCNT FROM seen2 WHERE seen2.seen_viewers =
cmntViewID GROUP BY seen2.seen_viewers;
END IF;
CLOSE cur1;
END$$
DELIMITER ;
this is how i call my procedure example
CALL seen_table (',',2995,'356',#count);

Answer 1

NULL counts as one, but as far as I can see it is against the ANSI standard: If there are not results, there should also be no NULL returned.
To get a row count returned from a procedure (or any result set) in MySQL, there are information functions.
I do not know which select you want to return the count, so just giving you an example:
{your procedure before this part}
IF cmntViewID = "*" THEN
SELECT SQL_CALC_FOUND_ROWS * FROM seen2 GROUP BY seen2.seen_viewers;
SELECT COUNT(*) INTO viewCNT FROM seen2;
ELSE
SELECT * FROM seen2 WHERE seen2.seen_viewers = cmntViewID GROUP BY
seen2.seen_viewers;
SELECT seen_ID INTO viewCNT FROM seen2 WHERE seen2.seen_viewers =
cmntViewID GROUP BY seen2.seen_viewers;
END IF;
{your procedure after this part}
Then execute:
CALL seen_table();
SELECT FOUND_ROWS();
That will return the number of rows in the "SELECT SQL_CALC_FOUND_ROWS * FROM seen2 GROUP BY seen2.seen_viewers;" query.