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Is multiplication and division using shift operators in C actually faster?
...with the core i7:
(from http://software.intel.com/en-us/forums/showthread.php?t=61481)
The latency is 1 cycle for an integer addition and 3 cycles for an integer multiplication. You can find the latencies and thoughput in Appendix C of the "Intel® 64 and IA-32 Architectures Optimization Refere...
How can you encode a string to Base64 in JavaScript?
I have a PHP script that can encode a PNG image to a Base64 string.
26 Answers
26
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How can I implement an Access Control List in my Web MVC application?
...r" would be a service, which might knit together some domain object with a PHPMailer or SwiftMailer, or your own mail-sender component.
Another source of services are abstraction on to on domain and data access layers. They are created to simplify the code used by controllers. For example: creating...
How to create GUID / UUID?
...a UUID from Truly Random or Pseudo-Random Numbers: rfc-archive.org/getrfc.php?rfc=4122
– Jason DeFontes
Sep 19 '08 at 20:28
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What are the differences between Autotools, Cmake and Scons?
... a pamphlet or a blog post), and it's more of a fractal of bad design than PHP.
– weberc2
Apr 27 '15 at 18:53
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What are the underlying data structures used for Redis?
... dynamic string library so that we don't pay (asymptotically speaking) for allocations in append operations. This way we have O(N) appends, for instance, instead of having quadratic behavior.
Lists are implemented with linked lists.
Sets and Hashes are implemented with hash tables.
Sorted sets are i...
How to explain callbacks in plain english? How are they different from calling one function from ano
...ich would be processed in the process of another function. For example in PHP array_filter() and array_map() take callbacks to be called in a loop.
– Haralan Dobrev
Mar 13 '12 at 23:33
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CDN（内容分发网络）技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...功能，所以大部分网页对象（Web page object），如html, htm, php等页面文件，gif,tif, png, bmp等图片文件，以及其他格式的文件，在有效期（TTL）内，对于重复的访问，不必从原始网站重新传送文件实体，只需通过简单的认证（Freshness V...
What's the difference between equal?, eql?, ===, and ==?
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You might be familiar with === as an equality operator in Javascript and PHP, but this just not an equality operator in Ruby and has fundamentally different semantics.
So what does === do?
=== is the pattern matching operator!
=== matches regular expressions
=== checks range membership
=== che...
Is there a list of screen resolutions for all Android based phones and tablets? [closed]
...arsed list of screens:
From http://www.emirweb.com/ScreenDeviceStatistics.php
####################################################################################################
# Filter out same-sized same-dp screens and width/height swap.
#####################################################...