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Xcode Debugger: view value of variable
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edited May 23 '17 at 12:10
Community♦
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answered Jan 19 '11 at 15:15
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Purpose of Unions in C and C++
...n one of the Technical Corrigenda to the C99 standard (see DR#257 and DR#283). However, keep in mind that formally this does not protect you from running into undefined behavior by attempting to read a trap representation.
s...
What's the role of adapters in Android?
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edited Jan 31 '17 at 20:31
Hermann Döppes
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“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP
..., "", "0", null, false or [].
Example:
$o = [];
@$var = ["",0,null,1,2,3,$foo,$o['myIndex']];
array_walk($var, function($v) {
echo (!isset($v) || $v == false) ? 'true ' : 'false';
echo ' ' . (empty($v) ? 'true' : 'false');
echo "\n";
});
Test the above snippet in the 3v4l.org onlin...
What's a good way to extend Error in JavaScript?
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23 Answers
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How does this giant regex work?
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163
This is not entirely a regular expression. The regex is /.*/, which basically means "match ev...
Receive JSON POST with PHP
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answered Sep 18 '13 at 8:30
DomDom
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What are bitwise shift (bit-shift) operators and how do they work?
...ed, in memory, as a series of bits. For example, the number 6 stored as a 32-bit int would be:
00000000 00000000 00000000 00000110
Shifting this bit pattern to the left one position (6 << 1) would result in the number 12:
00000000 00000000 00000000 00001100
As you can see, the digits have s...
Why would $_FILES be empty when uploading files to PHP?
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answered Aug 27 '10 at 18:39
shamittomarshamittomar
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CentOS 6.4下Squid代理服务器的安装与配置 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...发送数据请求；
2. 代理服务器检查自己的数据缓存；
3. 代理服务器在缓存中没有找到用户想要的数据；
4. 代理服务器向Internet 上的远端服务器发送数据请求；
5. 远端服务器响应，返回相应的数据；
6. 代理服务器取得远端...