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PHP中9大缓存技术总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
PHP中9大缓存技术总结1、全页面静态化缓存也就是将页面全部生成html静态页面，用户访问时直接访问的静态页面，而不会去走php服务器解析的流程。此种方式，在CMS...1、全页面静态化缓存
也就是将页面全部生成html静态页面，...
Wolfram's Rule 34 in XKCD [closed]
...ur of rule 34: http://atlas.wolfram.com/01/01/34/
Hilighted rules (Wolfram selection): http://atlas.wolfram.com/01/01/
Index of all 256 rules: http://atlas.wolfram.com/01/01/rulelist.html
The book contains thousands of nice little diagrams.
...
How is a CRC32 checksum calculated?
...e CRC-32 as a series of "Binary Arithmetic with No Carries", or basically "XOR and shift operations". This is technically called Polynomial Arithmetic.
CRC primer, Chapter 5
To better understand it, think of this multiplication:
(x^3 + x^2 + x^0)(x^3 + x^1 + x^0)
= (x^6 + x^4 + x^3
+ x^5 + x^3...
How to encrypt String in Java
...[] ivBytes;
Now you can initialize the Cipher for the algorithm that you select:
// wrap key data in Key/IV specs to pass to cipher
SecretKeySpec key = new SecretKeySpec(keyBytes, "DES");
IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
// create the cipher with the algorithm you choose
// ...
techniques for obscuring sensitive strings in C++
...e sure that the key is not within the printable range.
Obscuring key with XOR
For instance, you could use XOR to split the key into two byte arrays:
key = key1 XOR key2
If you create key1 with the same byte-length as key you can use (completely) random byte values and then compute key2:
key1[n...
XPath OR operator for different nodes
...
If you want to select only one of two nodes with union operator, you can use this solution:
(//bookstore/book/title | //bookstore/city/zipcode/title)[1]
share
...
What does value & 0xff do in Java?
... ;//(.....000110)
onWhichThisHasTobeReSet &= thirdBitTobeReSet;
XOR
Just note that if you perform XOR operation twice, will results the same value.
byte toBeEncrypted = 0010 0110
byte salt = 0100 1011
byte encryptedVal = toBeEncrypted ^ salt == 0110 1101
byte decryptedV...
Merge multiple lines (two blocks) in Vim
...
You can certainly do all this with a single copy/paste (using block-mode selection), but I'm guessing that's not what you want.
If you want to do this with just Ex commands
:5,8del | let l=split(@") | 1,4s/$/\=remove(l,0)/
will transform
work it
make it
do it
makes us
harder
better
faster...
How to implement a good __hash__ function in python [duplicate]
...more expensive than it needs to be.
Edit: I would recommend against using xor to mix hashes in general. When two different properties have the same value, they will have the same hash, and with xor these will cancel eachother out. Tuples use a more complex calculation to mix hashes, see tuplehash i...
&& (AND) and || (OR) in IF statements
... or; ((A?1:0) * (B?1:0)) == 1, ((A?1:0) + (B?1:0)) > 0. You can even do xor: ((A?1:0) + (B?1:0)) == 1.
– outis
Nov 27 '09 at 12:19
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