[PHP] Having trouble formatting width using printf() and default spaces

[David Scott]

I'm using a for() loop to generate random die rolls. I'd like the 
numbers to be formatted in a grid.

for ($i = 0; $i < 100; $i++) {
        if (!($i % 5)) {
                print("<br />");
        }
        printf("%'.10u", rand(1,$sides));
}
Currently, I'm padding with '.', but I'd like to pad with the default 
spaces.

For example, printf("%10u", rand(1,$sides)); Except the numbers end up like,

7 10 14 19 3
4 6 16 13 2
etc.
Why is it that when I leave out the padding character, the output isn't 
padded?

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