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App Inventor 2开发计步器与定位器 - App Inventor 2 中文网 - 清泛IT论坛，有思想、有深度
...能。
2.主题：编写“健身宝”手机应用程序
3.问题：
（1）如何获取走路步数、距离？
（2）如何计算走路时间？
（3）如何获得当前位置？
（4）如何存储信息？
4.规划：
（1）利用pedome...
How does Facebook Sharer select Images and other metadata when sharing my URL?
...elect an image?
Yes, you just need to add multiple image meta tags in the order you want them to appear in. The user will then be presented with an image selector dialog:
I specified the appropriate image meta tags. Why isn't Facebook accepting the changes?
Once a url has been shared, Facebook's...
Why do people say that Ruby is slow? [closed]
... Computer Language Benchmarks Game:
Ruby 1.9 vs. Python3 within the same order of magnitude
Ruby 1.9 vs. PHP within the same order of magnitude
Ruby 1.9 vs. Java 6 server up to two orders of magnitude slower!
Ruby 1.9 vs. C (gcc) up to two orders of magnitude slower!
...
Why is Ruby considere...
领域驱动设计系列（三）:事件驱动上 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...nt.DeActive();
_emailService.SendEmail();
}
}
但是，问题来了，如果后来我们要说，如果设备坏了，我们要更改可用库存的数量，这时候我们是不是要在这里修改代码而引入IInventoryService? 后来如果经理说设备坏了你们尽然...
PHP: How to generate a random, unique, alphanumeric string for use in a secret link?
... and it sends you an email with a link, and you have to click that link in order to verify your account
30 Answers
...
What is the use of the @ symbol in PHP?
... Cool feature.. It makes the use of isset()'s unnecessary in order to avoid undefined offset errors.
– W.M.
Dec 17 '16 at 20:55
add a comment
...
PHP array delete by value (not key)
...ould need array_values() as well; the remaining keys are still in the same order though, so technically it's not "unsorted"
– Ja͢ck
Dec 26 '14 at 5:27
...
初窥InnoDB的Memcached插件 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...务器不仅浪费了内存，而且还必须自己维护数据的不一致问题，有了Memcached插件，这些问题都不存在了，而且借助MySQL本身的复制功能，我们可以说是变相的实现了Memcached的复制，这更是意外之喜。
安装
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Error in exception handler. - Laravel
...
Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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json_encode is returning NULL?
...ult = mysql_query('SELECT `id`, `name`, `description`, `icon` FROM `staff` ORDER BY `id` DESC LIMIT 20') or die(mysql_error());
$rows = array();
while($row = mysql_fetch_assoc($result)){
$rows[] = $row;
}
echo json_encode($rows);
?>
When iterating over mysql_num_rows you should use < n...