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Way to get all alphabetic chars in an array in PHP?
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answered Jan 10 '09 at 23:05
PEZPEZ
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新手程序员应该知道的7件事 - 创意 - 清泛网 - 专注C/C++及内核技术
...候，对于计算机我有很多不明白的地方。文件系统，网络连接以及内存机制就是三个明显的例子。不了解这些，意味着我可能会不知道一些我想要呈现的编程结构的目标。”
2、知道命令行工具
作为一个开发人员，你必然需要...
What is “rvalue reference for *this”?
...-value. So if this is in the type Object:
Object foo;
foo.RValueFunc(); //error: no `RValueFunc` version exists that takes `this` as l-value.
Object().RValueFunc(); //calls the non-const, && version.
This way, you can specialize behavior based on whether the object is being accessed via a...
How to only find files in a given directory, and ignore subdirectories using bash
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If you just want to limit the find to the first level you can do:
find /dev -maxdepth 1 -name...
How can I check if a directory exists in a Bash shell script?
...INK"
if [ -d "$SYMLINK" ]; then
rmdir "$SYMLINK"
fi
Will produce the error message:
rmdir: failed to remove `symlink': Not a directory
So symbolic links may have to be treated differently, if subsequent commands expect directories:
if [ -d "$LINK_OR_DIR" ]; then
if [ -L "$LINK_OR_DIR" ]...
SQL - HAVING vs. WHERE
...the [country] filtering to the WHERE has you've suggested, the query would error from SELECT [country], as [country] is no longer included in the GROUP BY aggregation, thus cannot be selected.
– Nhan
Nov 8 '19 at 22:40
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Making WPF applications look Metro-styled, even in Windows 7? (Window Chrome / Theming / Theme)
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– FlyingMaverick
May 12 '14 at 19:05
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How do I enumerate the properties of a JavaScript object? [duplicate]
...wnPropertyNames(obj) is what you want if you are dealing with some sort of Error object (ex. TypeError) because the properties are non-enumerable.
– vossad01
Oct 24 '16 at 16:18
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How do I create a slug in Django?
...ce def save(self): with def save(self, *args, **kwargs): in order to avoid errors from being thrown when writing something like test.objects.create(q="blah blah blah").
– Liam
Mar 24 '10 at 17:11
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How can I format my grep output to show line numbers at the end of the line, and also the hit count?
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your solution seems fine but get an error awk95: syntax error at source line context is >>> ' <<< missing } awk95: bailing out at source line 1
– London
Oct 19 '10 at 12:27
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