Correct way of implementing if else loop or else if and can i write function inside a loop

function toltalRetailerComm($userId) {
    //print_r ($shoppeId);
    $sql = "SELECT shoppe_id FROM atm_super_shoppe WHERE user_id='$userId'";
    $query = $this->db->query($sql);
    if ($query->num_rows() > 0) {
        $result = $query->row();
        $shoppeId = $result->shoppe_id;

        $sql = "SELECT COALESCE(sum(commission),0) as commission FROM atm_shoppe_commission WHERE shoppe_id ='$shoppeId'";
        $query = $this->db->query($sql);
        print_r($shoppeId);
        if ($query->num_rows > 0) {
            $result = $query->row();
            $commission = $result->commission;
            return $commission;
        } else {

Blockquote block2

            $sql = "SELECT shoppe_id FROM atm_store WHERE user_id='$userId'";
            $query = $this->db->query($sql);
            if ($query->num_rows() > 0) {
                $result = $query->row();
                $storeId = $result->shoppe_id;
                $sql = "SELECT COALESCE(sum(commission),0) as commission FROM atm_store_commission WHERE shoppe_id ='$storeId'";
                $query = $this->db->query($sql);
                print_r($storeId);
                if ($query->num_rows >开发者_StackOverflow社区; 0) {
                    $result = $query->row();
                    $commission = $result->commission;
                    return $commission;
                }
            }
        }
    }
}

I'm new to PHP, can anyone tell me the correct way of using an if/else or elseif in the code shown above? Its not able to go to the second block. Also and can I write a function inside an if/else block?

Are you looking for something like this:

function toltalRetailerComm($userId) {
    //print_r ($shoppeId);
    $sql = "SELECT shoppe_id FROM atm_super_shoppe WHERE user_id='$userId'";
    $shoppe_query = $this->db->query($sql);

    $sql = "SELECT shoppe_id FROM atm_store WHERE user_id='$userId'";
    $store_query = $this->db->query($sql);

    if ($shoppe_query->num_rows() > 0) {
        $result = $shoppe_query->row();
        $shoppeId = $result->shoppe_id;

        $sql = "SELECT COALESCE(sum(commission),0) as commission FROM atm_shoppe_commission WHERE shoppe_id ='$shoppeId'";
        $query = $this->db->query($sql);
        print_r($shoppeId);
        if ($query->num_rows > 0) {
            $result = $query->row();
            $commission = $result->commission;
            return $commission;
        }
    } else if ($store_query->num_rows() > 0) {
                $result = $store_query->row();
                $storeId = $result->shoppe_id;
                $sql = "SELECT COALESCE(sum(commission),0) as commission FROM atm_store_commission WHERE shoppe_id ='$storeId'";
                $query = $this->db->query($sql);
                print_r($storeId);
                if ($query->num_rows > 0) {
                    $result = $query->row();
                    $commission = $result->commission;
                    return $commission;
                }
            }
        }

Each of your ifs checks if there are any results from the query. If there are - the if section is executed. If not - the else section is executed (and if there is no else, nothing is executed).

As to your question about functions - you can't create a function inside an if/else block, but you can call a function from it. You create a function:

function total ($a, $b){
    return $a+$b;
}

and the you can call it from the if block:

if ($a==$b){
   $c = total ($a,$b);
}

EDIT: As to your question about not getting to the second block. Before the second block there is an if as follows:

$sql = "SELECT COALESCE(sum(commission),0) as commission FROM atm_shoppe_commission WHERE shoppe_id ='$shoppeId'";
        $query = $this->db->query($sql);
        print_r($shoppeId);
        if ($query->num_rows > 0) 

The if checks if any rows were returned from the sql query that is supposed to return the first nonnull expression that follows the condition shoppe_id ='$shoppeId' . Only if no rows are returned, it gets to the second block, which is the else of this condition.