$array = array('a1' => 1, 'a2' => 2, 'c' => 3);
$filtered = Arrays::filterByKeys($array, function ($elem) {
return $elem[0] == 'a';
});
Result:
Array
(
[a1] => 1
[b2] => 2
)
public static function filterByKeys(array $elements, $predicate)
{
$allowedKeys = array_filter(array_keys($elements), $predicate);
return self::filterByAllowedKeys($elements, $allowedKeys);
} 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)))));
});
}
