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What's better at freeing memory with PHP: unset() or $var = null

I realise the second one avoids the overhead of a function call ( update , is actually a language construct), but it would be interesting to know if one is better than the other. I have been using unset() for most of my coding, but I've recently looked through a few respectable classes found off t...
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Purpose of Trigraph sequences in C++?

According to C++'03 Standard 2.3/1: 9 Answers 9 ...
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Reliable way for a Bash script to get the full path to itself [duplicate]

I have a Bash script that needs to know its full path. I'm trying to find a broadly-compatible way of doing that without ending up with relative or funky-looking paths. I only need to support Bash, not sh, csh, etc. ...
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Why is it impossible to override a getter-only property and add a setter? [closed]

Why is the following C# code not allowed: 16 Answers 16 ...
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What Computer Science concepts should I know? [closed]

What concepts in Computer Science do you think have made you a better programmer? 33 Answers ...
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How do I make an html link look like a button?

I'm using ASP.NET, some of my buttons just do redirects. I'd rather they were ordinary links, but I don't want my users to notice much difference in the appearance. I considered images wrapped by anchors, i.e. tags, but I don't want to have to fire up an image editor every time I change the text ...
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TortoiseSVN icons not showing up under Windows 7

I can't seem to get the icons to display under Windows 7 and I really miss this from Windows XP. 31 Answers ...
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*.h or *.hpp for your class definitions

I've always used a *.h file for my class definitions, but after reading some boost library code, I realised they all use *.hpp . I've always had an aversion to that file extension, I think mainly because I'm not used to it. ...
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How to change the background color of the options menu?

I'm trying to change the default color for the options menu which is white: I want a black background for every item on the options menu. ...
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“405 method not allowed” in IIS7.5 for “PUT” method

I use WebClient type to upload *.cab files to my server. On the server side, I registered a HTTP handler for *.cab file with the PUT method as below: ...