php - how to echo an array of varriable in a page? -

i starting learning codes , writing codes echo array , give me error "warning: invalid argument supplied foreach() in c:\xampp\htdocs\ogmt\rest_server_api.php on line 62" how can solve this? code:

   if($result1){     // script business no, amount & merchant id,output merchant page       $query="select * customer_order insert_time=(select max(order_time)from customer_order)";       $result=mysql_query($query);       while($row=mysql_fetch_assoc($result)){           $amount=$row['amount'];           $id=$row['merchant_id'];           $payment_mode=$row['mobile_service'];           switch($payment_mode){                           case 'tigo-pesa':             $result1=mysql_query("select * mobile_client mobile_service='tigo-pesa'");             while($row1=mysql_fetch_assoc($result1)){                   $data=array(                    'business no'=>$row1['business_no'],                    'payment mode'=>$payment_mode,                    'total amount tsh'=>$amount,                    'merchant id'=>$id                    );                    }break;              case 'm-pesa':             $result1=mysql_query("select * mobile_client mobile_service='m-pesa'");             while($row1=mysql_fetch_assoc($result1)){                   $data=array(                    'business no'=>$row1['business_no'],                    'payment mode'=>$payment_mode,                    'total amount tsh'=>$amount,                    'merchant id'=>$id                    );                    }break;             case 'airtel-money':             $result1=mysql_query("select * mobile_client mobile_service='airtel-money'");             while($row1=mysql_fetch_assoc($result1)){                   $data=array(                    'business no'=>$row1['business_no'],                    'payment mode'=>$payment_mode,                    'total amount tsh'=>$amount,                    'merchant id'=>$id                     );                    }break;             default:            $data=array('error'=>"no payment mode selected");                 }      }            foreach( $data $value ){               echo $value;                  }                    }             else{       echo "wrong";     } } 

you can use print_r() print array. this:

echo '<pre>'; print_r($data); echo '</pre>'; 

if $data array. can debug yourself.

note first declare $data array @ top of script. like: $data = array();