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京东618:算法让UV价值提升200%+,用智能卖场缩短购物路径 - 更多技术 - 清...
...区画像,除了界面的差异,两者在后端的处理上要解决的问题有什么不同?对推荐搜索和移动研发、交易平台研发的协作有什么样的要求?
智能卖场团队:这两者要解决的问题本质上是相同的,所以用的算法引擎是相同的。但...
What is the difference between single-quoted and double-quoted strings in PHP?
I'm a little confused why I see some code in PHP with string placed in single quotes and sometimes in double quotes.
12 Ans...
Asserting successive calls to a mock method
...ch function call receives a tuple of (args, kwargs), so to check that "foo(123)" was called correctly, you need to "assert mock.call_args == ((123,), {})", which is a mouthful compared to "call(123)"
– Jonathan Hartley
Jan 25 '16 at 20:52
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php is null or empty?
I have a question regarding NULL in PHP:
9 Answers
9
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Decimal number regular expression, where digit after decimal is optional
...pace & comments in regular expression)
For example, it will match:
123
23.45
34.
.45
-123
-273.15
-42.
-.45
+516
+9.8
+2.
+.5
And will reject these non-numbers:
. (single decimal point)
-. (negative decimal point)
+. (plus decimal point)
(empty string)
The simpler solutions can incorre...
Show a number to two decimal places
What's the correct way to round a PHP string to two decimal places?
24 Answers
24
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Prevent direct access to a php include file
I have a php file which I will be using as exclusively as an include. Therefore I would like to throw an error instead of executing it when it's accessed directly by typing in the URL instead of being included.
...
Difference between float and double in php?
...
There is no difference in PHP. float, double or real are the same datatype.
At the C level, everything is stored as a double.
The real size is still platform-dependent.
See the manual for more details:
http://www.php.net/manual/en/language.types.flo...
BIO与NIO、AIO的区别(这个容易理解) - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...于事件驱动思想来完成的,其主要想解决的是BIO的大并发问题: 在使用同步I/O的网络应用中,如果要同时处理多个客户端请求,或是在客户端要同时和多个服务器进行通讯,就必须使用多线程来处理。也就是说,将每一个客户...
How to extract a floating number from a string [duplicate]
... [-+]? # optional sign
... (?:
... (?: \d* \. \d+ ) # .1 .12 .123 etc 9.1 etc 98.1 etc
... |
... (?: \d+ \.? ) # 1. 12. 123. etc 1 12 123 etc
... )
... # followed by optional exponent part if desired
... (?: [Ee] [+-]? \d+ ) ?
... """
>>> rx = re...
