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使用虚拟现实和App Inventor进行实验 · App Inventor 2 中文网
...该资产。特别是，MITVRHelper 无法使用资产文件。解决这个问题的方法是将资产文件复制到手机存储的另一部分，并让 MITVRHelper 访问副本。
更尴尬的是：标准 App Inventor 不包含复制文件的操作。幸运的是，由于 Taifun Bär（谢谢 Tai...
Best way to clear a PHP array's values
Which is more efficient for clearing all values in an array? The first one would require me to use that function each time in the loop of the second example.
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json_encode sparse PHP array as JSON array, not JSON object
...at is, if its keys are 0, 1, 2, 3, ...
You can reindex your array sequentially using the array_values function to get the behaviour you want. For example, the code below works successfully in your use case:
echo json_encode(array_values($input)).
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C++并发编程（中文版） - 文档下载 - 清泛网 - 专注C/C++及内核技术
...28
第3章 在线程间共享数据… 29
3.1 线程之间共享数据的问题… 29
3.1.1 竞争条件… 31
3.1.2 避免有问题的竞争条件… 31
3.2 用互斥元保护共享数据… 32
3.2.1 使用C++中的互斥元… 32
3.2.2 用于保护共享数据的结构化代码… 33
3.2.3...
Using crontab to execute script every minute and another every 24 hours [closed]
I need a crontab syntax which should execute a specific PHP script /var/www/html/a.php every minute. The execution on every minute must start at 00:00. The other task which must execute a script at 00:00 /var/www/html/reset.php (once every 24 hours).
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Foreign keys in mongo?
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UPD. I'am using PHP as a programming language, how can I use mongoid, if it is written in Ruby?
– Mark Pegasov
Jun 13 '11 at 17:54
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互联网金融创业大赛收官 揭示创业三大风向标 - 资讯 - 清泛网 - 专注C/C++...
...年递增，租房成了大学生以及刚工作的小白领们最头疼的问题。对于他们来说，工资相对较低，房租成为每月的一笔巨额花销，使生活捉襟见肘。更何况，大多数房东为避免麻烦，通常会要求提前支付半年，甚至一年的租金，这...
.htaccess mod_rewrite - how to exclude directory from rewrite rule
...ries on my server from these rules, so they can become accessible. For now all requests are sent to index.php file.
6 Answ...
How to add elements to an empty array in PHP?
...ration, but it also doesn't impose the performance overhead of a function call, which array_push() would. Edit: But, great answer. Effectively the same, and majority of uses won't even notice a performance difference, but helps to know those nuances.
– Mattygabe
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How do you use the “WITH” clause in MySQL?
I am converting all my SQL Server queries to MySQL and my queries that have WITH in them are all failing. Here's an example:
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