How generate column using for loop - php

Question

How to make this function produce column occLvl_ loop 3 time and using explode to fetch each value from sql CONCAT. So the result will become like this.
[{
"accommodationID": "LA56",
"occLvl_0": "40.00",
"occLvl_1": "70.00",
"occLvl_2": "90.00"
}]
function getOccLevel(){
global $ehorsObj;
$occArray = array();
$sql = "SELECT accommodationID, GROUP_CONCAT(occLevelDesc) AS occLevels
FROM tblSamAccOccLevels
WHERE ACTIVE = 'y'
GROUP BY accommodationID
ORDER BY accommodationID ASC, occLevelDesc ASC ";
$GetResult = $ehorsObj->FetchData($sql, $ehorsObj->DEFAULT_PDO_CONNECTIONS);
while ($row = $GetResult->fetch()){
$occArray[] = array(
'accommodationID' => $row['accommodationID'],
);
//seem the method below is not working
for ($j = 0; $j < 3; $j++) {
$occArray["occLvl_".$j] = explode(",", $row['occLevels'])
}
}
header("Content-type: application/json");
$result = json_encode($occArray);
echo $result;
}
Result of the query
accommodationID occLevels
LA56 40.00, 70.00, 90.00

Answer 1

Making numerically named object properties/variables (occLvl_0 etc.) is generally a bad idea as it makes it difficult to work with them in any regular manner (e.g. using a loop). It is better practice to put the values into an array:
while ($row = $GetResult->fetch()){
$occArray[] = array(
'accommodationID' => $row['accommodationID'],
'occLvl' => explode(",", $row['occLevels'])
);
}
This will give you an output JSON that looks something like:
[
{
"accommodationID": "LA56",
"occLvl": [
40,
70,
90
]
},
{
"accommodationID": "PQ45",
"occLvl": [
30,
60,
100
]
},
...
]
And in your JS you can then iterate over the occLvl array to get the values.
If you need the data in the form you describe, then you need to iterate over the exploded occLevels value to generate the individual values, pushing them with the accommodationID into a new array and then pushing that array to $occArray:
while ($row = $GetResult->fetch()){
$this_occ = array(
'accommodationID' => $row['accommodationID'],
);
foreach (explode(",", $row['occLevels']) as $key => $occLvl) {
$this_occ["occLvl_$key"] = $occLvl;
}
$occArray[] = $this_occ;
}

Answer 2

Explode returns an array. You should explode before the loop and iterate through the result of that explode in the loop