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Lua简明教程 - 脚本技术 - 清泛IT论坛，有思想、有深度
...r/local/bin/lua
print("Hello, World")
chenhao-air:lua chenhao$ chmod +x hello.lua
chenhao-air:test chenhao$ ./hello.lua
Hello, World复制代码
语法注释 -- 两个减号是行注释
--[[
这是块注释
这是块注释
变量Lua的数字只有double型，64bits，...
Why is XOR the default way to combine hashes?
...at looks half decent on the surface, but not after further inspection.
On modern hardware, adding usually about as fast as xor (it probably uses more power to pull this off, admittedly). Adding's truth table is similar to xor on the bit in question, but it also sends a bit to the next bit over whe...
Convert PDF to clean SVG? [closed]
...does a good job anyway, and can be useful to anyone who does not intend to modify the code in the svg file, so I'll leave the post.
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Why are unsigned int's not CLS compliant?
...king, unsigned addition with overflow checking, and sign-agnostic addition mod 2^32, etc.; when asked to convert an object reference to a 32-bit integer primitive, the CLR neither knows nor cares whether the code using that number expects it to be signed or unsigned. Whether the compiler believes a...
Python's many ways of string formatting — are the older ones (going to be) deprecated?
...se #4966: revamp the sequence docs in order to better explain the state of modern Python. This might seem like a sign that a plan to deprecate % formatting was back on the cards... but diving into the bug tracker reveals that the intent was the opposite. On the bug tracker, the author of the commit ...
How do I expire a PHP session after 30 minutes?
...sion handler, the age of the session data is calculated on the file's last modification date and not the last access date:
Note: If you are using the default file-based session handler, your filesystem must keep track of access times (atime). Windows FAT does not so you will have to come up with...
Transfer-Encoding: gzip vs. Content-Encoding: gzip
...s: Different Content-Encoding requires different ETag This is btw what the mod_deflate bug I refer to in my answer is all about. Makes me wonder why this application-level detail is in the HTTP standard in the first place. When using Transfer-Encoding however, a transport level setting, there's no n...
“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP
...m via $_GET and the remaining method=POST fields in $_POST alongside.
With modern PHP configurations (≥ 5.6) it has become feasible (not fashionable) to use $_REQUEST['vars'] again, which mashes GET and POST params.
If you are employing mod_rewrite, then you should check both the access.log as we...
What are the differences between WCF and ASMX web services?
...ould reply that WCF would need to add a streamlined K.I.S.S. configuration mode in order to completely replace ASMX.
Example web.config for an ASMX webservice:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<appSettings />
<system.web>
<compilation target...
Why is unsigned integer overflow defined behavior but signed integer overflow isn't?
...nary notation.
C99 6.2.6.2:2:
If the sign bit is one, the value shall be modified in one of the following ways:
— the corresponding value with sign bit 0 is negated (sign and magnitude);
— the sign bit has the value −(2N) (two’s complement);
— the sign bit has the value −(2N − 1) (on...