Stored Procedures Return Mysql Php - php

Question

I wrote a stored procedure in mysql, which does an insert into a table and the selects a field(id), so that it later be assigned to a php variable, to eventually pass it as a parameter to another mysql procedure. The first procedure works fine when I call it from mysql, it returns the value it was meant to. The problem lays on when I try to obtain that value from php.
Heres my code:
DELIMITER $
CREATE PROCEDURE addEntity(p_idPerson INT(11),
p_nameP VARCHAR(50), p_objective VARCHAR(8),
OUT p_idProduct INT(11)
)
BEGIN
INSERT INTO EntityTb (idPerson, nameP, objective) VALUES(p_idPerson, p_nameP, p_objective);
SET p_idProduct= (SELECT idProduct FROM EntityTb WHERE idPerson= p_idPerson ORDER BY idProduct DESC LIMIT 1);
SELECT p_idProduct;
END$
DELIMITER;
PHP
$prep_stmt = "CALL addEntity(?,?,?,?)";
$insert_stmt = $mysqli->prepare($prep_stmt);
$p_id= "#p_idProduct";
if ($insert_stmt) {
$insert_stmt->bind_param('issi', $arg1, $arg2, $arg3 $p_id);
$insert_stmt->execute();
while ($rs= $insert_stmt->fetch()) {
//debug($rs);
echo "\r\n rs: ".$rs;
}
}

Answer 1

I fixed it. Just had to change the php code above to the one below.
$insert_stmt= $mysqli->query("CALL addProduct($arg1, '$arg2', '$arg3', #p_idProduct)");
if ($insert_stmt->field_count)
{
$rs= $insert_stmt->fetch_assoc();
$id_prod= $rs['p_idProduct'];
echo "id_product: ".$id_product;
}