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How to encrypt/decrypt data in php?
... $length = $size - strlen($data) % $size;
return $data . str_repeat(chr($length), $length);
}
$name = 'Jack';
$enc_name = openssl_encrypt(
pkcs7_pad($name, 16), // padded data
'AES-256-CBC', // cipher and mode
$encryption_key, // secret key
0, /...
What is the difference between a string and a byte string?
...
@ChrisStryczynski see the comments above - sure they're stored in memory somehow, but that form is explicitly abstracted away. Indeed, these days, it can change during the lifetime of a program and be different between differe...
Alternative to google finance api [closed]
...L,BAC,BK,BCR,BAX,BBT,BDX,BBBY,BBY,BIIB,BLK,HRB,BA,BWA,BXP,BSX,BMY,BRCM,BFB,CHRW,CA,CVC,COG,CAM,CPB,COF,CAH,HSIC,KMX,CCL,CAT,CBG,CBS,CELG,CNP,CTL,CERN,CF,SCHW,CHK,CVX,CMG,CB,CI,XEC,CINF,CTAS,CSCO,C,CTXS,CLX,CME,CMS,COH,KO,CCE,CTSH,CL,CMA,CSC,CAG,COP,CNX,ED,STZ,GLW,COST,CCI,CSX,CMI,CVS,DHI,DHR,DRI,DVA...
Evaluating a mathematical expression in a string
...3.6 because of f-strings, which allow the following attack: f"{eval('()' + chr(46) + '__class__')}". A solution based on whitelisting rather than blacklisting will be safer, but really it's better to solve this problem without eval at all.
– kaya3
Dec 14 '19 at...
What is the difference between Ruby 1.8 and Ruby 1.9
..._PREDEFINED) {|c| PREDEFINED[c.ord]}
pack and unpack
Ruby 1.8.6
def xchr(escape=true)
n = XChar::CP1252[self] || self
case n when *XChar::VALID
XChar::PREDEFINED[n] or
(n>128 ? n.chr : (escape ? "&##{n};" : [n].pack('U*')))
else
Builder::XChar::REPLACEMENT_CHAR
en...
What is a higher kinded type in Scala?
...esting depth, to the left, of function arrows:
Order 0: 1 :: Int
Order 1: chr :: Int -> Char
Order 2: fix :: (a -> a) -> a, map :: (a -> b) -> [a] -> [b]
Order 3: ((A -> B) -> C) -> D
Order 4: (((A -> B) -> C) -> D) -> E
So, long story short, a higher-kinded ...
What are JavaScript's builtin strings?
...that piece of code just for fun in order to send it to my wife on February 14 :) Having only Chrome installed on the laptop I had no options to check how it works in Firefox and IE. Moreover, I haven't really expected that toString() representation of build-in methods might look differently in other...
6个变态的C语言Hello World程序 - 创意 - 清泛网 - 专注C/C++及内核技术
...要动用C++...下面的六个程序片段主要完成这些事情：
1、输出Hello, World
2、混乱C语言的源代码
下面的所有程序都可以在GCC下编译通过，只有最后一个需要动用C++的编译器g++才能编程通过。
hello1.c
#define _________ }
#define ...
Fastest way to determine if an integer's square root is an integer
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Regular expression that matches valid IPv6 addresses
...section 2.2 of rfc5952)
link-local IPv6 addresses with zone index (section 11 of rfc4007)
IPv4-Embedded IPv6 Address (section 2 of rfc6052)
IPv4-mapped IPv6 addresses (section 2.1 of rfc2765)
IPv4-translated addresses (section 2.1 of rfc2765)
IPv6 Regular Expression:
(([0-9a-fA-F]{1,4}:){7,7}[0-...