$array = array(
'k1' => 'v1',
'k2' => 'v2',
'k3' => 'v3'
);
$arrayWithNewKeys = Arrays::mapKeys($array, function ($key) {
return 'new_' . $key;
});
Result:
Array
(
[new_k1] => v1
[new_k2] => v2
[new_k3] => v3
)
public static function mapKeys(array $elements, $function)
{
$newArray = array();
foreach ($elements as $oldKey => $value) {
$newKey = Functions::call($function, $oldKey);
$newArray[$newKey] = $value;
}
return $newArray;
} /**
* @test
*/
public function shouldMapKeys()
{
//given
$array = array('k1' => 'v1', 'k2' => 'v2', 'k3' => 'v3');
//when
$arrayWithNewKeys = Arrays::mapKeys($array, function ($key) {
return 'new_' . $key;
});
//then
$this->assertEquals(array('new_k1' => 'v1', 'new_k2' => 'v2', 'new_k3' => 'v3'), $arrayWithNewKeys);
}
