[PHP] Separating spaces from the rest

[Anguz]

I have an array with many strings, of which most have spaces or tabs at 
the beginning, but no fixed number of them. Example:

$arr[0] = '    Hello.';

How can I separate them into two strings? Like:

Array
(
    [0] => Array
        (
            [0] => "    "  //I added the quotes to notice the space.
            [1] => Hello.
        )
)
TIA!
Anguz
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