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How does PHP 'foreach' actually work?

Let me prefix this by saying that I know what foreach is, does and how to use it. This question concerns how it works under the bonnet, and I don't want any answers along the lines of "this is how you loop an array with foreach ". ...
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How do I use extern to share variables between source files?

...ferenced in other source files, such as file2.c. It is important to understand the difference between defining a variable and declaring a variable: A variable is declared when the compiler is informed that a variable exists (and this is its type); it does not allocate the storage for the variable a...
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Make xargs execute the command once for each line of input

How can I make xargs execute the command exactly once for each line of input given? It's default behavior is to chunk the lines and execute the command once, passing multiple lines to each instance. ...
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Foreign key constraint may cause cycles or multiple cascade paths?

... SQL Server does simple counting of cascade paths and, rather than trying to work out whether any cycles actually exist, it assumes the worst and refuses to create the referential actions (CASCADE): you can and should still create the constraints without the referential acti...
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XAMPP - Port 80 in use by “Unable to open process” with PID 4! 12

... Open a CMD prompt as administrator and execute the following command: net stop was /y Open the Run dialog box (press Win+R), then type: services.msc Then search for World Wide Web Publishing Service (WWW-Publishing Service) and Web Deployment Agent Service...
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ASP.NET MVC View Engine Comparison

...r game here. Just alphabetize new View Engines (leaving WebFormViewEngine and Razor at the top), and try to be objective in comparisons. System.Web.Mvc.WebFormViewEngine Design Goals: A view engine that is used to render a Web Forms page to the response. Pros: ubiquitous since it ship...
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How to split/partition a dataset into training and test datasets for, e.g., cross validation?

What is a good way to split a NumPy array randomly into training and testing/validation dataset? Something similar to the cvpartition or crossvalind functions in Matlab. ...
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Why is SCTP not much used/known

...cked out the book "UNIX Network Programming, Vol. 1" by Richards Stevens and I found that there is a third transport layer standard besides TCP and UDP: SCTP . ...
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One DbContext per web request… why?

...g how to set up Entity Framework's DbContext so that only one is created and used per HTTP web request using various DI frameworks. ...
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What's the difference between an element and a node in XML?

I'm working in Java with XML and I'm wondering; what's the difference between an element and a node? 13 Answers ...