Invokes the function for each key in the array. Creates a new array containing the keys returned by the function.
Example:
$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
)
/**
* @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'), $arrayWithNewKeys);
}
public function mapKeys($function)
{
$this->_array = Arrays::mapKeys($this->_array, $function);
return $this;
}
public function getRequestHeaders()
{
$headers = Arrays::filterByKeys($_SERVER, Functions::startsWith('HTTP_'));
return Arrays::mapKeys($headers, function ($key) {
return str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($key, 5)))));
});
}
