Add data dynamically to an Array

Question

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?         


        

Answer 1

$array[] = 'Hi';

pushes on top of the array.

$array['Hi'] = 'FooBar';

sets a specific index.