Php Mysql insert query doesnt work under if condition or direct

Question

Mysql insert query is not insert under condition. Its not giving any kind of error. But update query is working. please help

//this query gets the status of reward system if its enabled
$reward =   mysql_fetch_assoc(mysql_query("
            select * from on_off where ename = 'reward' and status = 1
            "));
            $trueN  =   $reward['status'];

//this query gets the info if member already exist
// if member record already exist then it will update otherwise it will insert
$rewardz    =   mysql_query("
            select * from rewards where mem_id = 1
            ");
            $trueM  =   mysql_num_rows($rewardz);

if ($trueN == 1 && $trueM == 1){

mysql_query("
update rewards
set amount = 12
where mem_id = 1
");

}elseif ($trueN == 1 && $trueM == 0){

$insert=mysql_query("INSERT INTO `rewards` (`amount`, `mem_id`)
VALUES (1, 1)");

}

Answer 1

you need to use mysqli_multi_query() to perform multiple queries. read more on this link http://php.net/manual/en/mysqli.quickstart.multiple-statement.php