Display static message for empty values - php

Question

i tried below code to fetch results of column dpaid_status from mysql database & its working fine:
Database
site
$i = 0;
foreach($order as $orderData)
{
$k = 0;
$orderitems = $orderData['dproduct_id'];
$orderitemsarray = explode(",", $orderitems);
while ($k < count($orderitemsarray))
{
if ($orderitemsarray[$k] != '0')
{
$stmtorders = $user_home->runQuery("SELECT * FROM order_details");
$stmtorders->execute(array(":dorder_id" => $orderData['entity_id']));
$roworders = $stmtorders->fetch(PDO::FETCH_ASSOC);
$dorderStatus = $roworders['dpaid_status'];
$productdetail = Mage::getModel('catalog/product')->load($orderitemsarray[$k]);
$designer_id = $productdetail->getDesignerID() ;
if($accountType == "admin")
{
$designerName = getDesignerName($productdetail->getDesignerID()) . " -(" . $productdetail->getDesignerID() . ")";
$stmt1 = $user_home->runQuery("SELECT * FROM order_details WHERE dproduct_id=:pid and designerorder_id=:doid");
$stmt1->execute(array(
":doid" => $orderData->getIncrementId(),
":pid" => $orderitemsarray[$k],
));
$paid_status='';
while($datas = $stmt1->fetch())
{
$paid_status=$datas['dpaid_status'];
}
$responce[] = array(
$paid_status
);
return json_encode($responce);
But for some columns there is no value for dpaid_status, so i wanted to display none for those in page. so instead of $paid_status=$datas['dpaid_status']; i tried below code ,
if ($roworders['dorder_id'] == '')
{
$paid_status='unpaid';
}
else
{
$paid_status=$datas['dpaid_status'];
}
ex : in above image there is no row for "15585" in database , so it should display unpaid for that.... but now its displaying blank....

Answer 1

You should check your $paid_status variable right before returning/using it. This way you will catch all cases when the value is empty (either empty value in the table or missing row in the database table).
I have added the new lines to your code, below:
$stmt1 = $user_home->runQuery("SELECT * FROM order_details WHERE dproduct_id=:pid and designerorder_id=:doid");
$stmt1->execute(array(
":doid" => $orderData->getIncrementId(),
":pid" => $orderitemsarray[$k],
));
$paid_status='';
while($datas = $stmt1->fetch())
{
$paid_status=$datas['dpaid_status'];
}
//added new lines of code here - START
if ( $paid_status == ''){
$paid_status='unpaid';
}
//added new lines of code here - END
$responce[] = array(
$paid_status
);

Answer 2

You can solve the problem also at SQL level, just using a query like:
SELECT [field_list], IFNULL(dpaid_status, 'unpaid') as paid_status FROM order_details
which return the dpaid_status value if the field is not null, else return 'unpaid'

Answer 3

You just need to use PHP empty().
Determine whether a variable is considered to be empty. A variable is
considered empty if it does not exist or if its value equals FALSE.
empty() does not generate a warning if the variable does not exist.
The following things are considered to be empty:
"" (an empty string)
0 (0 as an integer)
0.0 (0 as a float)
"0" (0 as a string)
NULL
FALSE
array() (an empty array)
$var; (a variable declared, but without a value)
so your if statement can be written
if (empty($roworders['dpaid_status']))
{
$paid_status='unpaid';
}
else
{
$paid_status=$datas['dpaid_status'];
}

Answer 4

if ($roworders['dpaid_status'] != '')
{
$paid_status=$datas['dpaid_status'];
}
else
{
$paid_status='unpaid';
}