code for replace null with quotes

https://gist.github.com/tureki/7af3ea2554eba60c34c5 $value = array(
	"deep"=>1,
	"data"=>null,
	"node"=>array(
	"deep"=>2,
	"data"=>null,
	"node"=>array(
	"deep"=>3
	)
	),
	null
	);
	array_walk_recursive($value, function (&$item, $key) {
	$item = null === $item ? '' : $item;
	});
	echo json_encode($value);