I have the same problem for 2 month .. but in javascript ..after a lot of search and my old way .. find out we have array_flip.. :)

my old code:

$array = array('name' => 'mostafa', 'family' => 'mason', 'phone' => '524854745', 'sid' => '85487452660');
// Swap keys 'name' and 'sid'
list($array['name'], $array['sid']) = array($array['sid'], $array['name']);
// Swap keys 'family' and 'phone'
list($array['family'], $array['phone']) = array($array['phone'], $array['family']);
var_dump($array);

and new one:

$array = array('a' => 'val1', 'b' => 'val2', 'c' => 'val3', 'd' => 'val4');
$array = array_flip($array);
var_dump($array);