将key=>value合并为symfony中的值

$array1 = array('key1' => 'value1', 'key2' => 'value2');
$array2 = array('key3' => 'value3', 'key4' => 'value4');

$result = array_merge($array1, $array2);

print_r($result);

Array
(
    [key1] => value1
    [key2] => value2
    [key3] => value3
    [key4] => value4
)