A +1 from me (in case my vote counts).

The main reason behind it is readability:

$x = array(1 =>  array(1, 2, 3), array(array(1), 2));

vs.

$x = [1 =>  [1, 2, 3], [[1], 2]];

The latter form looks much better to me - it is faster to read and to 
understand it (and to type it, of course, although it shouldn't be a 
factor), especially for such multi-dimensional definitions.

The benefit of using the new syntax is even bigger when dealing with 
function calls + conditionals:

if (in_array($z, array(1, 2, 3))) {
   $s = str_replace(array('a', 'b', 'c'), array('d', 'e', 'f'), 'abc');
}

vs.

if (in_array($z, [1, 2, 3])) {
   $s = str_replace(['a', 'b', 'c'], ['d', 'e', 'f'], 'abc');
}

With the "square brackets" syntax a pair of redundant parantheses is 
removed, thus making it easier to distinguish between data definition 
and function call (conditional, expression...) closures and helping 
identify arrays among such compound structures. ;-)

Regards,
-- 
Kouber Saparev
http://kouber.saparev.com

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