Built a multidimensional array with PHP from an SQL query - php

Question

Form a SQL query i receive the following datas from two differences tables.
|----------------|----------|--------------|
|CON_ContinentId | FRU_Name | FRU_Quantity |
|----------------|----------|--------------|
| 1 | Apple | 100 |
| 1 | Banana | 200 |
| 2 | Peach | 300 |
| 2 | Cherry | 400 |
| 3 | Coconut | 500 |
| 4 | Grape | 1100 |
| 5 | Pear | 1500 |
|----------------|----------|--------------|
I need to get an array like this:
$datas = [
1 => [
[
'FRU_Name' => 'Apple',
'FRU_Quantity' => '100'
],
[
'FRU_Name' => 'Banana',
'FRU_Quantity' => '200'
]
],
2 => [
[
'FRU_Name' => 'Peach',
'FRU_Quantity' => '300'
],
[
'FRU_Name' => 'Cherry',
'FRU_Quantity' => '400'
]
],
3 => [
[
'FRU_Name' => 'Coconut',
'FRU_Quantity' => '500'
]
],
4 => [
[
'FRU_Name' => 'Grape',
'FRU_Quantity' => '1000'
]
],
5 => [
[
'FRU_Name' => 'Pear',
'FRU_Quantity' => '1100'
]
],
]
So, basically, I need to groupe the rows with the same CON_ContinentId and list the FRU_Name and FRU_Quantity.
What I try:
$datas = [];
while ($fetch = $query->fetch(PDO::FETCH_ASSOC)){
$CON_ContinentId = $fetch['CON_ContinentId'];
$FRU_Name = $fetch['FRU_Name'];
$FRU_Quantity = $fetch['FRU_Quantity'];
if (!in_array($CON_ContinentId, $datas)) {
$datas = array(
'CON_ContinentId' => $CON_ContinentId,
'FRU_Name' => $FRU_Name,
'FRU_Quantity' => $FRU_Quantity
);
}
}
But it doesn't work.
Could you please help me ?
Thanks.

Answer 1

There are a few different problems in your code:
Your desired array structure isn't valid, so it's unclear what you want.
$datas isn't initialized. Use $datas = [] instead.
$FRU_Name is being set twice? Did you mean $FRU_Quantity?
This code won't group multiple fruits under their continent ID--it'll put them into an associative array alongside their continent ID.

Answer 2

Every iteration of your results set, just use the CON_ContinentID value as the key, then [] to auto-index the subarrays.
There is no need to declare resultset values to new variables, just apply them to the $datas declaration and move on.
while ($fetch = $query->fetch(PDO::FETCH_ASSOC)){
$datas[$fetch['CON_ContinentId']][]=['FRU_Name'=>$fetch['FRU_Name'],'FRU_Quantity' =>$fetch['FRU_Quantity']];
}
a bit more explanation...
// hard-coded keys -vvvvvvvv-----------------------vvvvvvvvvvvv
$datas[$fetch['CON_ContinentId']][]=['FRU_Name'=>$fetch['FRU_Name'],'FRU_Quantity' =>$fetch['FRU_Quantity']];
// id-^^^^^^^^^^^^^^^^^^^^^^^^^ ^^-auto-index ^^^^^^^^^^^^^^^^^^------------------^^^^^^^^^^^^^^^^^^^^^^-resultset data
// ^^^^^^^^^^-keys start from zero, and increment by one at each new pushed subarray)