Next key in array

Question

I have an array:

$array=array(
    "sdf"=>500,
    "gsda"=>1000,
    "bsdf"=>1500,
    "bads"=>2000,
    "iurt"=>2500,
    "poli"=>3000
);

How can I get the name of the next key? For example if the current array is gsda, I need bsdf.

Answer 1

next($array);
$key = key($array);
prev($array);