Description:
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It would be lovely to be able to literally define arrays with 
simple syntax like the following:

["one", "two", "three"]

instead of the less intuitive:

array("one", "two", "three");

This would simplify creating arrays of arrays (of arrays) 
inline for functions. Also, this would help solve the 'named 
parameters' request by allowing for an associative array to be 
given simply by throwing []s in.

Reproduce code:
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Here is an example just for the sake of clarity:

$validate = [$_POST['post'], ['title'=>'/[A-Za-z0-9_\?\!\.\#\&\%]+/', "text"=>'/\w*/', 'user_id'=>'/\d+/']];

This would be in opposition to:

$validate = array($_POST['post'], array('title'=>'/[A-Za-z0-9_\?\!\.\#\&\%]+/', "text"=>'/.*/', 'user_id'=>'/\d+/'));

You can see how more complex examples can get just that much more complex (the the nth degree).