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如何选择机器学习算法 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...学习算法Choosing-a-Machine-Learning-Classifier如何针对某个分类问题决定使用何种机器学习算法？ 当然，如果你真心在乎准确率，最好的途径就是测试一大堆各式各样的算法（同时确保在每个算法上也测试不同的参数），最后选择在交...
jQuery.parseJSON throws “Invalid JSON” error due to escaped single quote in JSON
...able, textual, and a subset of JavaScript. The less we need to agree on in order to interoperate, the more easily we can interoperate.
So perhaps he decided to only allow strings to be defined using double-quotes since this is one less rule that all JSON implementations must agree on. As a result,...
实现一个简单的服务端推方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...时性较差。虽然可以通过加快轮询频率的方式来缓解这个问题，但相应付出的代价也不小：一来会使负载居高不下，二来也会让带宽捉襟见肘。
再来说说Long Polling，如果使用传统的LAMP技术去实现的话，大致如下所示：
Long Pol...
PDO support for multiple queries (PDO_MYSQL, PDO_MYSQLND)
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As I know, PDO_MYSQLND replaced PDO_MYSQL in PHP 5.3. Confusing part is that name is still PDO_MYSQL. So now ND is default driver for MySQL+PDO.
Overall, to execute multiple queries at once you need:
PHP 5.3+
mysqlnd
Emulated prepared statements. Make sure PDO::ATTR_EM...
How to delete object from array inside foreach loop?
...es, arrays in PHP are basically associative arrays that can be iterated in order. Deleting an earlier element does not change the keys of elements that come after it.
– Ignacio Vazquez-Abrams
Feb 21 '10 at 3:02
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How to get ID of the last updated row in MySQL?
...d out the last updated row, you can use this code.
SELECT id FROM mytable ORDER BY lastmodified DESC LIMIT 1;
This code is all lifted from MySQL vs PostgreSQL: Adding a 'Last Modified Time' Column to a Table and MySQL Manual: Sorting Rows. I just assembled it.
...
How to output in CLI during execution of PHP Unit tests?
When running a PHPUnit test, I would like to be able to dump output so I can debug one or two things.
17 Answers
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“互联网卖菜”没那么简单 创业者不要盲目跟风 - 资讯 - 清泛网 - 专注C/C+...
...自提的鲜果说，还是送菜上门的七天买菜网，都因为价格问题导致的盈利困境而歇业，价格是上门送菜的最大障碍，要么狂砸补贴，要么把量做大，维持开支，没有别的路。笔者接触过一些做上门送菜的创业者，往往会问第一个...
Strtotime() doesn't work with dd/mm/YYYY format
... users question - it is a roundabout way of solving the actual problem. In order for strtotime() to properly parse a date in the format "dd/mm/yy", you need to replace the "/" with "-". Therefore you only really need the first two lines of the answer: $date = '25/05/2010'; $date = str_replace('/',...
Do I have to guard against SQL injection if I used a dropdown?
... {
// Not Expected
}
Then use mysqli_* if you are using a version of php >= 5.3.0 which you should be, to save your result. If used correctly this will help with sql injection.
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