Regular Expression to extract php code partially (( array definition ))

I have php code stored (( array definition )) in a string like this

$code=' array(

  0  => "a",
 "a" => $GlobalScopeVar,
 "b" => array("nested"=>array(1,2,3)),  
 "c" => function() use (&$VAR) { return isset($VAR) ? "defined" : "undefined" ; },

); ';

there is a regular expression to extract this array??, i mean i want something like

$array=(  

  0  => '"a"',
 'a' => '$GlobalScopeVar',
 'b' => 'array("nested"=>array(1,2,3))',
 'c' => 'function() use (&$VAR) { return isset($VAR) ? "defined" : "undefined" ; }',

);

pD :: i do research trying to find a regular expression but nothing was found.
pD2 :: gods of stackoverflow, let me bounty this now and i will offer 400 :3
pD3 :: this will be used in a internal app, where i need extract an array of some php file to be 'processed' in parts, i try explain with this codepad.org/td6LVVme