PHP-从以特定字符串开头的数组中获取所有键

$arr_main_array = array('foo-test' => 123, 'other-test' => 456, 'foo-result' => 789);foreach($arr_main_array as $key => $value){    $exp_key = explode('-', $key);    if($exp_key[0] == 'foo'){         $arr_result[] = $value;    }}if(isset($arr_result)){    print_r($arr_result);}