I want to add data to an array dynamically. How can I do that? Example
$arr1 = [
'aaa',
'bbb',
'ccc',
];
// How can I now add another value?
$arr2 = [
'A' => 'aaa',
'B' => 'bbb',
'C' => 'ccc',
];
// How can I now add a D?
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