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How do I expire a PHP session after 30 minutes?
...ms with filesystems where atime tracking is not available.
So it additionally might occur that a session data file is deleted while the session itself is still considered as valid because the session data was not updated recently.
And second:
session.cookie_lifetime
session.cookie_lifetime ...
git: How to ignore all present untracked files?
Is there a handy way to ignore all untracked files and folders in a git repository?
(I know about the .gitignore .)
8 An...
What's wrong with using $_REQUEST[]?
...a number of posts on here saying not to use the $_REQUEST variable. I usually don't, but sometimes it's convenient. What's wrong with it?
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设置用户默认权限 Umask命令详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...22 = 644
注：权限计算实际上是二进制位的与操作，参考All About the umask and Permissions。
操作bar.tar
shell> tar xf bar.tar
这次有点不同，我们要运行两次tar命令。
第一次：以root身份运行tar命令，然后查看目录和文件的权限，分别...
Reverse of JSON.stringify?
...
JSON.stringify and JSON.parse are almost oposites, and "usually" this kind of thing will work:
var obj = ...;
var json = JSON.stringify(obj);
var obj2 = JSON.parse(json);
so that obj and obj2 are "the same".
However there are some limitations to be aware of.
Often these issues ...
What's the point of const pointers?
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"Help the compiler help you" is the mantra I normally chant for this.
– Flexo♦
Oct 11 '11 at 9:44
1
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What is the difference between UNION and UNION ALL?
What is the difference between UNION and UNION ALL ?
26 Answers
26
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What is the “volatile” keyword used for?
...optimisation would still be valid with i marked as volatile. In Java it is all about happens-before relationships.
– Tom Hawtin - tackline
Aug 7 '10 at 14:39
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Python != operation vs “is not”
...right hand side and the left hand side are the very same object. No methodcalls are done, objects can't influence the is operation.
You use is (and is not) for singletons, like None, where you don't care about objects that might want to pretend to be None or where you want to protect against object...
Why can I change value of a constant in javascript
...se I thought that idea of the constant is that it can not be changed. Basically a programmer has trust that no matter what will happen, nothing can change the value inside of my constant.
– Salvador Dali
May 2 '14 at 20:39
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