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来自 , 2019-09-03, 写在 PHP, 查看 106 次.
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  1. $keys = array("category" => 1);
  2. $initial = array("items" => array());
  3. $reduce = "function (obj, prev) { prev.items.push(obj.name); }";
  4. $g = $collection->group($keys, $initial, $reduce);
  5. print_r($g);   //结果如下。
  7. (
  8.     [retval] => Array
  9.         (
  10.             [0] => Array
  11.                 (
  12.                     [category] => fruit
  13.                     [items] => Array
  14.                         (
  15.                             [0] => apple
  16.                             [1] => peach
  17.                             [2] => banana
  18.                         )
  19.                 )
  20.             [1] => Array
  21.                 (
  22.                     [category] => veggie
  23.                     [items] => Array
  24.                         (
  25.                             [0] => corn
  26.                             [1] => broccoli
  27.                         )
  28.                 )
  29.         )
  30.     [count] => 5
  31.     [keys] => 2
  32.     [ok] => 1
  33. )

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