change the output of the php query result as array - php

Question

I have a PHP code which has the following output:
[{"stockdata":29655.88482666}]
And I need to change the code on my php to get the result in this format:
[{"data": [29655.88482666]}]
This is the code of my php:
<?php
function getArraySQL(){
$startd = "29964";
$endd = "29968";
$dsn = "prueba";
$connect = odbc_connect( $dsn, '', '' );
$query = "
Select SUM(TON_DESCARGADO) as stockdata
from
(Select unit,[load],enum_LOAD.[name],SUM(dumptons) as TON_DESCARGADO
from hist_dumps inner join hist_loclist on hist_dumps.shiftindex = hist_loclist.shiftindex
and hist_dumps.loc = hist_loclist.locid
inner join enum_LOAD on hist_dumps.[load] = enum_LOAD.[num]
where hist_dumps.shiftindex between '$startd' and '$endd'
GROUP BY loc,UNIT,unit#,[load],enum_LOAD.[name])TEMP1
where unit = 'Stockpile'
GROUP BY unit
order BY UNIT";
if(!$rs = odbc_exec($connect, $query)) die();
$rawdata = array();
$i=0;
while($row = odbc_fetch_array($rs))
{
$rawdata[$i] = $row;
$i++;
}
odbc_close( $connect );
return $rawdata;
};
$stockdata = getArraySQL();
echo json_encode(($stockdata), JSON_NUMERIC_CHECK);
What need to be changed to get the correct format? Should I do something to improve the code of my php?
How should I write it if I connect php to SQL server via PDO and get the same result? (just an optional doubt)

Answer 1

I don't find custom output in json_encode, so if you want to customize the output of array , you would need to prepare it.
I assumed the data exists at zero index (0).
So, I use $stockdata[0]
for JSON_NUMERIC_CHECK replace, used (float)
here is the preparation of output to send exactly you want.
$stockdata = getArraySQL();
$Numeric_data = (float) $stockdata[0];
$data = '[{"data": ['.$Numeric_data.']}]';
echo $data;
Demo