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@fzbing 2015-06-08T05:15:19.000000Z 字数 8690 阅读 1996

php 引用和for

php

下面两个函数有什么区别 ?

  1. private function tree($list, $p_key, &$re)
  2. {
  3.     foreach ($list as $key => $val) {
  4.         if ($val['parent_id'] == $p_key) {
  5.             $re[] = $val;
  6.             unset($list[$key]);
  7.             $this->tree($list, $val['type_id'], $re);
  8.         }
  9.     }
  10. }
  1. private function tree(&$list, $p_key, &$re)
  2. {
  3.     foreach ($list as $key => $val) {
  4.         if ($val['parent_id'] == $p_key) {
  5.             $re[] = $val;
  6.             unset($list[$key]);
  7.             $this->tree($list, $val['type_id'], $re);
  8.         }
  9.     }
  10. }

测试用例 1

  1. array (size=5)
  2.   0 => 
  3.     array (size=5)
  4.       'type_id' => string '1' (length=1)
  5.       'parent_id' => null
  6.       'name' => string '每日一文' (length=12)
  7.       'create_time' => string '2015-06-07 08:12:39' (length=19)
  8.       'user_id' => string '1' (length=1)
  9.   1 => 
  10.     array (size=5)
  11.       'type_id' => string '30' (length=2)
  12.       'parent_id' => string '31' (length=2)
  13.       'name' => string '生活' (length=6)
  14.       'create_time' => string '2015-06-07 10:02:38' (length=19)
  15.       'user_id' => string '1' (length=1)
  16.   2 => 
  17.     array (size=5)
  18.       'type_id' => string '31' (length=2)
  19.       'parent_id' => string '1' (length=1)
  20.       'name' => string '在身边' (length=9)
  21.       'create_time' => string '2015-06-07 09:43:53' (length=19)
  22.       'user_id' => string '1' (length=1)
  23.   3 => 
  24.     array (size=5)
  25.       'type_id' => string '32' (length=2)
  26.       'parent_id' => string '31' (length=2)
  27.       'name' => string '陪伴' (length=6)
  28.       'create_time' => string '2015-06-07 09:44:22' (length=19)
  29.       'user_id' => string '1' (length=1)
  30.   4 => 
  31.     array (size=5)
  32.       'type_id' => string '34' (length=2)
  33.       'parent_id' => string '1' (length=1)
  34.       'name' => string '刻舟求剑' (length=12)
  35.       'create_time' => string '2015-06-07 22:54:00' (length=19)
  36.       'user_id' => string '1' (length=1)

1.非引用 结果

  1. array (size=5)
  2.   0 => 
  3.     array (size=5)
  4.       'type_id' => string '1' (length=1)
  5.       'parent_id' => null
  6.       'name' => string '每日一文' (length=12)
  7.       'create_time' => string '2015-06-07 08:12:39' (length=19)
  8.       'user_id' => string '1' (length=1)
  9.   1 => 
  10.     array (size=5)
  11.       'type_id' => string '31' (length=2)
  12.       'parent_id' => string '1' (length=1)
  13.       'name' => string '在身边' (length=9)
  14.       'create_time' => string '2015-06-08 00:04:31' (length=19)
  15.       'user_id' => string '1' (length=1)
  16.   2 => 
  17.     array (size=5)
  18.       'type_id' => string '30' (length=2)
  19.       'parent_id' => string '31' (length=2)
  20.       'name' => string '生活' (length=6)
  21.       'create_time' => string '2015-06-08 00:04:19' (length=19)
  22.       'user_id' => string '1' (length=1)
  23.   3 => 
  24.     array (size=5)
  25.       'type_id' => string '32' (length=2)
  26.       'parent_id' => string '31' (length=2)
  27.       'name' => string '陪伴' (length=6)
  28.       'create_time' => string '2015-06-07 09:44:22' (length=19)
  29.       'user_id' => string '1' (length=1)
  30.   4 => 
  31.     array (size=5)
  32.       'type_id' => string '34' (length=2)
  33.       'parent_id' => string '1' (length=1)
  34.       'name' => string '刻舟求剑' (length=12)
  35.       'create_time' => string '2015-06-07 22:54:00' (length=19)
  36.       'user_id' => string '1' (length=1)

正确结果

  1. 1
  2.     31
  3.         30
  4.         32
  5.     34

2. 引用 结果

  1. array (size=4)
  2.   0 => 
  3.     array (size=5)
  4.       'type_id' => string '1' (length=1)
  5.       'parent_id' => null
  6.       'name' => string '每日一文' (length=12)
  7.       'create_time' => string '2015-06-07 08:12:39' (length=19)
  8.       'user_id' => string '1' (length=1)
  9.   1 => 
  10.     array (size=5)
  11.       'type_id' => string '31' (length=2)
  12.       'parent_id' => string '1' (length=1)
  13.       'name' => string '在身边' (length=9)
  14.       'create_time' => string '2015-06-08 00:04:31' (length=19)
  15.       'user_id' => string '1' (length=1)
  16.   2 => 
  17.     array (size=5)
  18.       'type_id' => string '30' (length=2)
  19.       'parent_id' => string '31' (length=2)
  20.       'name' => string '生活' (length=6)
  21.       'create_time' => string '2015-06-08 00:04:19' (length=19)
  22.       'user_id' => string '1' (length=1)
  23.   3 => 
  24.     array (size=5)
  25.       'type_id' => string '32' (length=2)
  26.       'parent_id' => string '31' (length=2)
  27.       'name' => string '陪伴' (length=6)
  28.       'create_time' => string '2015-06-07 09:44:22' (length=19)
  29.       'user_id' => string '1' (length=1)

测试用例2

  1. array (size=5)
  2.   0 => 
  3.     array (size=5)
  4.       'type_id' => string '1' (length=1)
  5.       'parent_id' => null
  6.       'name' => string '每日一文' (length=12)
  7.       'create_time' => string '2015-06-07 08:12:39' (length=19)
  8.       'user_id' => string '1' (length=1)
  9.   1 => 
  10.     array (size=5)
  11.       'type_id' => string '30' (length=2)
  12.       'parent_id' => string '1' (length=1)
  13.       'name' => string '生活' (length=6)
  14.       'create_time' => string '2015-06-08 00:21:35' (length=19)
  15.       'user_id' => string '1' (length=1)
  16.   2 => 
  17.     array (size=5)
  18.       'type_id' => string '31' (length=2)
  19.       'parent_id' => string '30' (length=2)
  20.       'name' => string '在身边' (length=9)
  21.       'create_time' => string '2015-06-08 00:21:38' (length=19)
  22.       'user_id' => string '1' (length=1)
  23.   3 => 
  24.     array (size=5)
  25.       'type_id' => string '32' (length=2)
  26.       'parent_id' => string '31' (length=2)
  27.       'name' => string '陪伴' (length=6)
  28.       'create_time' => string '2015-06-07 09:44:22' (length=19)
  29.       'user_id' => string '1' (length=1)
  30.   4 => 
  31.     array (size=5)
  32.       'type_id' => string '34' (length=2)
  33.       'parent_id' => string '1' (length=1)
  34.       'name' => string '刻舟求剑' (length=12)
  35.       'create_time' => string '2015-06-07 22:54:00' (length=19)
  36.       'user_id' => string '1' (length=1)

1.非引用 结果

  1. array (size=5)
  2.   0 => 
  3.     array (size=5)
  4.       'type_id' => string '1' (length=1)
  5.       'parent_id' => null
  6.       'name' => string '每日一文' (length=12)
  7.       'create_time' => string '2015-06-07 08:12:39' (length=19)
  8.       'user_id' => string '1' (length=1)
  9.   1 => 
  10.     array (size=5)
  11.       'type_id' => string '30' (length=2)
  12.       'parent_id' => string '1' (length=1)
  13.       'name' => string '生活' (length=6)
  14.       'create_time' => string '2015-06-08 00:21:35' (length=19)
  15.       'user_id' => string '1' (length=1)
  16.   2 => 
  17.     array (size=5)
  18.       'type_id' => string '31' (length=2)
  19.       'parent_id' => string '30' (length=2)
  20.       'name' => string '在身边' (length=9)
  21.       'create_time' => string '2015-06-08 00:21:38' (length=19)
  22.       'user_id' => string '1' (length=1)
  23.   3 => 
  24.     array (size=5)
  25.       'type_id' => string '32' (length=2)
  26.       'parent_id' => string '31' (length=2)
  27.       'name' => string '陪伴' (length=6)
  28.       'create_time' => string '2015-06-07 09:44:22' (length=19)
  29.       'user_id' => string '1' (length=1)
  30.   4 => 
  31.     array (size=5)
  32.       'type_id' => string '34' (length=2)
  33.       'parent_id' => string '1' (length=1)
  34.       'name' => string '刻舟求剑' (length=12)
  35.       'create_time' => string '2015-06-07 22:54:00' (length=19)
  36.       'user_id' => string '1' (length=1)
  1. 1
  2.     30
  3.         31
  4.             32
  5.     34

2.引用 结果

  1. array (size=4)
  2.   0 => 
  3.     array (size=5)
  4.       'type_id' => string '1' (length=1)
  5.       'parent_id' => null
  6.       'name' => string '每日一文' (length=12)
  7.       'create_time' => string '2015-06-07 08:12:39' (length=19)
  8.       'user_id' => string '1' (length=1)
  9.   1 => 
  10.     array (size=5)
  11.       'type_id' => string '30' (length=2)
  12.       'parent_id' => string '1' (length=1)
  13.       'name' => string '生活' (length=6)
  14.       'create_time' => string '2015-06-08 00:21:35' (length=19)
  15.       'user_id' => string '1' (length=1)
  16.   2 => 
  17.     array (size=5)
  18.       'type_id' => string '31' (length=2)
  19.       'parent_id' => string '30' (length=2)
  20.       'name' => string '在身边' (length=9)
  21.       'create_time' => string '2015-06-08 00:21:38' (length=19)
  22.       'user_id' => string '1' (length=1)
  23.   3 => 
  24.     array (size=5)
  25.       'type_id' => string '32' (length=2)
  26.       'parent_id' => string '31' (length=2)
  27.       'name' => string '陪伴' (length=6)
  28.       'create_time' => string '2015-06-07 09:44:22' (length=19)
  29.       'user_id' => string '1' (length=1)

测试用例3

  1. array (size=5)
  2.   0 => 
  3.     array (size=5)
  4.       'type_id' => string '1' (length=1)
  5.       'parent_id' => string '34' (length=2)
  6.       'name' => string '每日一文' (length=12)
  7.       'create_time' => string '2015-06-08 00:27:55' (length=19)
  8.       'user_id' => string '1' (length=1)
  9.   1 => 
  10.     array (size=5)
  11.       'type_id' => string '30' (length=2)
  12.       'parent_id' => string '1' (length=1)
  13.       'name' => string '生活' (length=6)
  14.       'create_time' => string '2015-06-08 00:21:35' (length=19)
  15.       'user_id' => string '1' (length=1)
  16.   2 => 
  17.     array (size=5)
  18.       'type_id' => string '31' (length=2)
  19.       'parent_id' => string '30' (length=2)
  20.       'name' => string '在身边' (length=9)
  21.       'create_time' => string '2015-06-08 00:21:38' (length=19)
  22.       'user_id' => string '1' (length=1)
  23.   3 => 
  24.     array (size=5)
  25.       'type_id' => string '32' (length=2)
  26.       'parent_id' => string '31' (length=2)
  27.       'name' => string '陪伴' (length=6)
  28.       'create_time' => string '2015-06-07 09:44:22' (length=19)
  29.       'user_id' => string '1' (length=1)
  30.   4 => 
  31.     array (size=5)
  32.       'type_id' => string '34' (length=2)
  33.       'parent_id' => null
  34.       'name' => string '刻舟求剑' (length=12)
  35.       'create_time' => string '2015-06-08 00:27:17' (length=19)
  36.       'user_id' => string '1' (length=1)

1.非引用 结果

  1. array (size=5)
  2.   0 => 
  3.     array (size=5)
  4.       'type_id' => string '34' (length=2)
  5.       'parent_id' => null
  6.       'name' => string '刻舟求剑' (length=12)
  7.       'create_time' => string '2015-06-08 00:27:17' (length=19)
  8.       'user_id' => string '1' (length=1)
  9.   1 => 
  10.     array (size=5)
  11.       'type_id' => string '1' (length=1)
  12.       'parent_id' => string '34' (length=2)
  13.       'name' => string '每日一文' (length=12)
  14.       'create_time' => string '2015-06-08 00:27:55' (length=19)
  15.       'user_id' => string '1' (length=1)
  16.   2 => 
  17.     array (size=5)
  18.       'type_id' => string '30' (length=2)
  19.       'parent_id' => string '1' (length=1)
  20.       'name' => string '生活' (length=6)
  21.       'create_time' => string '2015-06-08 00:21:35' (length=19)
  22.       'user_id' => string '1' (length=1)
  23.   3 => 
  24.     array (size=5)
  25.       'type_id' => string '31' (length=2)
  26.       'parent_id' => string '30' (length=2)
  27.       'name' => string '在身边' (length=9)
  28.       'create_time' => string '2015-06-08 00:21:38' (length=19)
  29.       'user_id' => string '1' (length=1)
  30.   4 => 
  31.     array (size=5)
  32.       'type_id' => string '32' (length=2)
  33.       'parent_id' => string '31' (length=2)
  34.       'name' => string '陪伴' (length=6)
  35.       'create_time' => string '2015-06-07 09:44:22' (length=19)
  36.       'user_id' => string '1' (length=1)

2.引用 结果

  1. array (size=5)
  2.   0 => 
  3.     array (size=5)
  4.       'type_id' => string '34' (length=2)
  5.       'parent_id' => null
  6.       'name' => string '刻舟求剑' (length=12)
  7.       'create_time' => string '2015-06-08 00:27:17' (length=19)
  8.       'user_id' => string '1' (length=1)
  9.   1 => 
  10.     array (size=5)
  11.       'type_id' => string '1' (length=1)
  12.       'parent_id' => string '34' (length=2)
  13.       'name' => string '每日一文' (length=12)
  14.       'create_time' => string '2015-06-08 00:27:55' (length=19)
  15.       'user_id' => string '1' (length=1)
  16.   2 => 
  17.     array (size=5)
  18.       'type_id' => string '30' (length=2)
  19.       'parent_id' => string '1' (length=1)
  20.       'name' => string '生活' (length=6)
  21.       'create_time' => string '2015-06-08 00:21:35' (length=19)
  22.       'user_id' => string '1' (length=1)
  23.   3 => 
  24.     array (size=5)
  25.       'type_id' => string '31' (length=2)
  26.       'parent_id' => string '30' (length=2)
  27.       'name' => string '在身边' (length=9)
  28.       'create_time' => string '2015-06-08 00:21:38' (length=19)
  29.       'user_id' => string '1' (length=1)
  30.   4 => 
  31.     array (size=5)
  32.       'type_id' => string '32' (length=2)
  33.       'parent_id' => string '31' (length=2)
  34.       'name' => string '陪伴' (length=6)
  35.       'create_time' => string '2015-06-07 09:44:22' (length=19)
  36.       'user_id' => string '1' (length=1)
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