// 需要替换 key 的数组$arr_old = array(    '0' => array('id' => 1, 'name' => 'Carroll'),    '1' => array('id' => 2, 'name' => 'Chrdai'),    '3' => array('id' => 3, 'name' => 'xiaodai'),);// 将新的key定义一个新数组$key_name = array('key1','key2','key3');// 现在开始替换$arr_new = array_combine($key_name,$arr_old);var_dump($arr_new);/*array (size=3)  'key1' =>    array (size=2)      'id' => int 1      'name' => string 'Carroll' (length=7)  'key2' =>    array (size=2)      'id' => int 2      'name' => string 'Chrdai' (length=6)  'key3' =>    array (size=2)      'id' => int 3      'name' => string 'xiaodai' (length=7)*/