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php：获取数组第一个值 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...组第一个值。不过为了兼容性，建议还是采取reset(),current(),next()等函数来取数组中的值，reset($arr)后current($arr)取第一个值。自PHP 5.4版本后可以使用 [ ] 来取数据指定位置的元素，索引从0开始，即$arr[0]取数组第一个值。不过为了...
nsis安装、卸载时如何判断程序是否正在运行 并提示关闭？ - 更多技术 - 清...
nsis安装、卸载时如何判断程序是否正在运行 并提示关闭？;--------------------------------------------------------------!include logiclib.nshFindProcDLL::FindProc "Test.exe"StrCmp $R0...
;--------------------------------------------------------------
!include logiclib.nsh
Find...
nsis安装、卸载时如何判断程序是否正在运行 并提示关闭？ - 脚本技术 - 清...
;--------------------------------------------------------------
!include logiclib.nsh
FindProcDLL::FindProc "Test.exe"
StrCmp $R0 1 0 +2
messagebox::show MB_SETFOREGROUND|MB_ICONHAND|MB_DEFBUTTON3|MB_TOPMOST "${PRODUCT_NAME}" "" \
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Linux C/C++进程单实例互斥代码分享 - C/C++ - 清泛网 - 专注C/C++及内核技术
Linux C/C++进程单实例互斥代码分享linux-process-singleton分享一段LinuxC C++程序只能启动一份实例的实现代码，原理是通过文件锁互斥实现，最重要的是考虑了不同用户运行同一程序互斥的场景，已经过充分的测试，可直接用于实际项...
解决spawn-fcgi 报错：child exited with: xxx的方法 - 更多技术 - 清泛网 ...
解决spawn-fcgi 报错：child exited with: xxx的方法spawn-fcgi-child-exited-with出错的时候请加 -n 参数，会显示详细的错误信息：如：spawn-fcgi xxx -n出错的时候请加 -n 参数，会显示详细的错误信息：
如：spawn-fcgi xxx -nspawn fcgi
How to request a random row in SQL?
How can I request a random row (or as close to truly random as is possible) in pure SQL?
28 Answers
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Difference between signed / unsigned char [duplicate]
So I know that the difference between a signed int and unsigned int is that a bit is used to signify if the number if positive or negative, but how does this apply to a char ? How can a character be positive or negative?
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How does a Breadth-First Search work when looking for Shortest Path?
I've done some research, and I seem to be missing one small part of this algorithm. I understand how a Breadth-First Search works, but I don't understand how exactly it will get me to a specific path, as opposed to just telling me where each individual node can go. I guess the easiest way to explain...
Ignore outliers in ggplot2 boxplot
How would I ignore outliers in ggplot2 boxplot? I don't simply want them to disappear (i.e. outlier.size=0), but I want them to be ignored such that the y axis scales to show 1st/3rd percentile. My outliers are causing the "box" to shrink so small its practically a line. Are there some techniques...
Replace non-ASCII characters with a single space
I need to replace all non-ASCII (\x00-\x7F) characters with a space. I'm surprised that this is not dead-easy in Python, unless I'm missing something. The following function simply removes all non-ASCII characters:
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