我有以下多维组数组，并希望从2键到3键获得总数组数。
Array
(
[0] => Array
(
[0] => Array
(
[MessageIdx] => 4
[ID] => jack@example.com
[FirstName] => Jack
[LastName] => Jack
[Nickname] => Jack
[PhotoFilePathName] => 1452504870.png
[Text] =>
[PostedAt] => 2016-01-01 05:12:17
[NumLikes] => 49
)
[1] => Array
(
[MessageIdx] => 5
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-01 05:25:29
[NumLikes] => 14
)
[2] => Array
(
[MessageIdx] => 6
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-02 05:38:37
[NumLikes] => 5
)
[3] => Array
(
[MessageIdx] => 7
[ID] => jack@example.com
[FirstName] => Jack
[LastName] => Jack
[Nickname] => Jack
[PhotoFilePathName] => 1452504870.png
[Text] =>
[PostedAt] => 2016-01-02 08:38:37
[NumLikes] => 64
)
[4] => Array
(
[MessageIdx] => 8
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-03 10:38:37
[NumLikes] => 54
)
)
[1] => Array
(
[0] => Array
(
[MessageIdx] => 9
[ID] => jack@example.com
[FirstName] => Jack
[LastName] => Jack
[Nickname] => Jack
[PhotoFilePathName] => 1452504870.png
[Text] =>
[PostedAt] => 2016-01-03 12:49:47
[NumLikes] => 19
)
[1] => Array
(
[MessageIdx] => 10
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-04 06:23:26
[NumLikes] => 5
)
[2] => Array
(
[MessageIdx] => 11
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-04 10:36:34
[NumLikes] => 38
)
[3] => Array
(
[MessageIdx] => 12
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-05 10:36:34
[NumLikes] => 98
)
[4] => Array
(
[MessageIdx] => 13
[ID] => jack@example.com
[FirstName] => Jack
[LastName] => Jack
[Nickname] => Jack
[PhotoFilePathName] => 1452504870.png
[Text] =>
[PostedAt] => 2016-01-05 14:18:41
[NumLikes] => 87
)
)
[2] => Array
(
[0] => Array
(
[MessageIdx] => 14
[ID] => jack@example.com
[FirstName] => Jack
[LastName] => Jack
[Nickname] => Jack
[PhotoFilePathName] => 1452504870.png
[Text] =>
[PostedAt] => 2016-01-06 09:29:17
[NumLikes] => 59
)
[1] => Array
(
[MessageIdx] => 15
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-06 09:29:17
[NumLikes] => 72
)
[2] => Array
(
[MessageIdx] => 16
[ID] => jack@example.com
[FirstName] => Jack
[LastName] => Jack
[Nickname] => Jack
[PhotoFilePathName] => 1452504870.png
[Text] =>
[PostedAt] => 2016-01-06 12:39:33
[NumLikes] => 69
)
[3] => Array
(
[MessageIdx] => 17
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-07 06:10:51
[NumLikes] => 74
)
[4] => Array
(
[MessageIdx] => 18
[ID] => jack@example.com
[FirstName] => Jack
[LastName] => Jack
[Nickname] => Jack
[PhotoFilePathName] => 1452504870.png
[Text] =>
[PostedAt] => 2016-01-07 12:28:51
[NumLikes] => 19
)
)
[3] => Array
(
[0] => Array
(
[MessageIdx] => 19
[ID] => jack@example.com
[FirstName] => Jack
[LastName] => Jack
[Nickname] => Jack
[PhotoFilePathName] => 1452504870.png
[Text] =>
[PostedAt] => 2016-01-08 02:06:10
[NumLikes] => 32
)
[1] => Array
(
[MessageIdx] => 20
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-08 07:15:10
[NumLikes] => 47
)
[2] => Array
(
[MessageIdx] => 21
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-09 11:24:27
[NumLikes] => 82
)
[3] => Array
(
[MessageIdx] => 22
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-09 14:23:08
[NumLikes] => 71
)
)
)
现在我想在2键到最后一个键3之间启动数组总计。
Array
(
[2] => Array
(
[0] => Array
(
[MessageIdx] => 14
[ID] => jack@example.com
[FirstName] => Jack
[LastName] => Jack
[Nickname] => Jack
[PhotoFilePathName] => 1452504870.png
[Text] =>
[PostedAt] => 2016-01-06 09:29:17
[NumLikes] => 59
)
[1] => Array
(
[MessageIdx] => 15
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-06 09:29:17
[NumLikes] => 72
)
[2] => Array
(
[MessageIdx] => 16
[ID] => jack@example.com
[FirstName] => Jack
[LastName] => Jack
[Nickname] => Jack
[PhotoFilePathName] => 1452504870.png
[Text] =>
[PostedAt] => 2016-01-06 12:39:33
[NumLikes] => 69
)
[3] => Array
(
[MessageIdx] => 17
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-07 06:10:51
[NumLikes] => 74
)
[4] => Array
(
[MessageIdx] => 18
[ID] => jack@example.com
[FirstName] => Jack
[LastName] => Jack
[Nickname] => Jack
[PhotoFilePathName] => 1452504870.png
[Text] =>
[PostedAt] => 2016-01-07 12:28:51
[NumLikes] => 19
)
)
[3] => Array
(
[0] => Array
(
[MessageIdx] => 19
[ID] => jack@example.com
[FirstName] => Jack
[LastName] => Jack
[Nickname] => Jack
[PhotoFilePathName] => 1452504870.png
[Text] =>
[PostedAt] => 2016-01-08 02:06:10
[NumLikes] => 32
)
[1] => Array
(
[MessageIdx] => 20
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-08 07:15:10
[NumLikes] => 47
)
[2] => Array
(
[MessageIdx] => 21
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-09 11:24:27
[NumLikes] => 82
)
[3] => Array
(
[MessageIdx] => 22
[ID] => tom@example.com
[FirstName] => Tom
[LastName] =>
[Nickname] => Tom
[PhotoFilePathName] =>
[Text] =>
[PostedAt] => 2016-01-09 14:23:08
[NumLikes] => 71
)
)
)
从9密钥到2可以使用3个数组，我希望从数组中获取9个数。
知道如何获得数组的总数吗？
感谢。
答案 0 :(得分：1)
试试这段代码。
$selected_keys= range(2, 3);
$count= 0;
foreach($selected_keys as $selected_key) {
$count+= count($arr[$selected_key]);
}
echo $count;
输出
9
答案 1 :(得分：0)
对于您的具体问题，您可以只计算这两个索引并将它们相加：
$total = count($array[2]) + count(array[3]);
如果你想要一个更加动态的解决方案，它可以在密钥x和y之间起作用：
function countRange($array, $start, $end){
$total = 0;
foreach(range($start, $end) as $index){
if(isset($array[$index]) && is_array($array[$index])){
$total += count($array[$index]);
}
}
return $total;
}
echo 'total: ' . countRange($array, 2, 3);
答案 2 :(得分：0)
如果你正确地知道了键，那么你可以尝试这个 -
$keys= range(2, 3);
$count= 0;
foreach($keys as $key) {
$count+= count($yourarray[$key]);
}
如果您不确定密钥，也可以添加支票 -
$num = !empty($yourarray[$key]) ? count($yourarray[$key]) : 0;
$count+= $num;