how to insert data while looping and inside array as well - php

Question

This is my table order:
+-------+-------+
| month | count |
+-------+-------+
| 6 | 11 |
| 11 | 27 |
| 12 | 9 |
+-------+-------+
I want to create a graph using fusioncharts. Let's say that the year is 2017. How do I put the missing month into the array of which fusioncharts I'm using? I'm stuck on the condition.
This is my code:
$strQuery2 = "SELECT DATE_FORMAT(order_date, '%c') as month, COUNT(*) AS cnt FROM orders where YEAR(order_date)='2017' GROUP BY month ORDER BY `month` DESC";
$result2 = $dbhandle->query($strQuery2);
// Push the data into the array
while($row2 = $result2->fetch_assoc()) {
$q = $row2["month"];
$w = $row2["cnt"];
$e = 0;
$x = 1;
if ($x != $q){
echo "true";
array_push($arrData2["data"],
array(
"label" => $row2[$x],
"value" => $row2[$e]
)
);
}
else{
echo "false";
array_push($arrData2["data"],
array(
"label" => $row2["month"],
"value" => $row2["cnt"]
)
);
}
$x++;
echo $row2["month"] . "<br />";
echo $row2["cnt"] . "<br />";
}

Answer 1

You never get a month from the database that isn't there. If you push data into an empty array:
array_push($arrData2["data"]
you still end up with an array that only contains the months returned from the database.
What you can do is first create an array with all 12 months:
$arrData2["data"]=range(1,12,false);
You have now an array that contains 12 elements (months) from 1 - 12, all with values of false. (You could use any value, an array or false if you need).
Now inside your resultloop, just replace the array elements you have values for:
$arrData2["data"][$row2["month"]] = array(
'label' => $row2["month"],
'value' => $row2["cnt"]
);
$arrData2 now will look like:
array(
1 => false,
2 => false,
3 => false,
4 => false,
5 => false,
6 => array('label'=> 6,'value'=> 11),
7 => false,
8 => false,
9 => false,
10 => false,
11 => array('label'=> 11,'value'=> 27),
12 => array('label'=> 12,'value'=> 9)
)
Now you can replace all the false values for arrays with value 0
So your whole code could be schortened to:
//set empty array
$arrData2['data'] = range(1, 12, false);
//fill elements we know
while($row2 = $result2->fetch_assoc()) {
$arrData2["data"][$row2["month"]] = array(
'label' => $row2["month"],
'value' => $row2["cnt"]
);
}
//replace the rest with 0
foreach($arrData2["data"] as $key => $value){
// skip what we already know
if($values !== false) continue;
// replace the rest
$arrData2["data"][$key]=array(
'label'=>$key,
'value'=> 0
);
}
echo print_r($arrData2,true);

Answer 2

There are basically two ways to approach it. One to fill missing months on PHP side and one on SQL. I will give you SQL version:
SELECT
m.`month`,
IFNULL(x.cnt, 0) AS cnt
FROM
(SELECT 1 AS `month` UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9 UNION SELECT 10 UNION SELECT 11 UNION SELECT 12) AS m
LEFT JOIN (SELECT DATE_FORMAT(order_date, '%c') as `month`, COUNT(*) AS cnt FROM orders where YEAR(order_date)='2017' GROUP BY `month`) AS x ON m.`month` = x.`month`
ORDER BY m.`month` DESC
It basically generates list of all months from 1 to 12 and if such month exists in your query than it is filled with real value. Otherwise it's zero.