PHP: Adding multiple associative arrays to another array - php

Question

Here's a sample of data
Date | Source | Amount
-----------------------
01A | S1 | 12
01A | S4 | 2
01A | S7 | 134
02A | S1 | 126
03A | S4 | 10
02A | S7 | 0
02A | S1 | 3
02A | S4 | 4
02A | S7 | 5
The resulting array needs to look like:
Array
(
[01A] => Array
(
[S1] => 12
[S4] => 2
[S7] => 134
)
[02A] => Array
(
[S1] => 126
[S4] => 10
[S7] => 0
)
[03A] => Array
(
[S1] => 3
[S4] => 4
[S7] => 5
)
)
I've tried looking at pages such as PHP Adding multiple associative arrays to new array based on key, PHP multiple arrays to one associative array and Merge multiple associative arrays to a single array of associative arrays and playing around with code as below (not using the same data - but same theory) but it's not producing what I need. The code below just shows A and B
$array = Array();
$a=array( "ABC" => array("A"=>"RED","B"=>"GREEN"));
$b=array( "ABC" => array("C"=>"BLUE","D"=>"YELLOW"));
$array = $a + $b;
echo '<pre>';
print_r($array);
echo '</pre>';

Answer 1

KISS
$result = array();
foreach($rows as $row)
{
if(!isset($result[$row['Date']])) $result[$row['Date']] = array();
$result[$row['Date']][$row['Source']] = $row['Amount'];
}

Answer 2

Assuming you already have the data in the $input array, the code is as easy as:
$result = array();
foreach ($input as $row) {
$date = $row['Date'];
if (! array_key_exists($date, $result)) {
$result[$date] = array();
}
$result[$date][$row['Source']] = $row['Amount'];
}
If you don't have the data in $input but you fetch it from the database just replace the line:
foreach ($input as $row) {
with something that matches your data retrieval loop, f.e.:
while ($row = mysqli_fetch_assoc($result)) {