PHP Splitting an Array into two arrays - keys array and values array

Question

Is there an easy way to split an array into two arrays, one consisting of all the keys and the other consisting of all the values? This would be a reverse to the action of array_combine. Is there an inbuilt function for doing such a task? Let's use an example array:

$array = array('Tiger' => 'Forest', 'Hippo' => 'River', 'Bird' => 'Sky');

Is there a function that will split the above array into:

$array_keys = array('Tiger', 'Hippo', 'Bird');
$array_values = array('Forest', 'River', 'Sky');

Answer 1

There are two functions called array_keys and array_values:

$array_keys = array_keys($array);
$array_values = array_values($array);

Answer 2

There are two functions actually:

$keys = array_keys($array);
$values = array_values($array);

You can also do the exact opposite:

$array = array_combine($keys, $values);

Answer 3

use array_keys and array_values