I have array
$Old = [_1526906780329_329] => Array (
[frlabel] => aa
[enlabel] => AA
)
[_1526906783640_640] => Array (
[frlabel] => bb
[enlabel] => BB
)
I want $old
array to convert it in single array key value format like
array('AA' => 'aa','BB' => 'bb');