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Tracking the script execution time in PHP

PHP must track the amount of CPU time a particular script has used in order to enforce the max_execution_time limit. 18 A...
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How does the Amazon Recommendation feature work?

What technology goes in behind the screens of Amazon recommendation technology? I believe that Amazon recommendation is currently the best in the market, but how do they provide us with such relevant recommendations? ...
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If strings are immutable in .NET, then why does Substring take O(n) time?

Given that strings are immutable in .NET, I'm wondering why they have been designed such that string.Substring() takes O( substring.Length ) time, instead of O(1) ? ...
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What are the First and Second Level caches in Hibernate?

Can anyone explain in simple words what First and Second Level caching in Hibernate are? 7 Answers ...
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Fastest way to flatten / un-flatten nested JSON objects

...SON objects. It works, but it's a bit slow (triggers the 'long script' warning). 13 Answers ...
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Simple Digit Recognition OCR in OpenCV-Python

I am trying to implement a "Digit Recognition OCR" in OpenCV-Python (cv2). It is just for learning purposes. I would like to learn both KNearest and SVM features in OpenCV. ...
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In Functional Programming, what is a functor?

I've come across the term 'Functor' a few times while reading various articles on functional programming, but the authors typically assume the reader already understands the term. Looking around on the web has provided either excessively technical descriptions (see the Wikipedia article ) or incred...
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What is the difference between FragmentPagerAdapter and FragmentStatePagerAdapter?

... Like the docs say, think about it this way. If you were to do an application like a book reader, you will not want to load all the fragments into memory at once. You would like to load and destroy Fragments as the user reads. In this case you wil...
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Is it possible to have different Git configuration for different projects?

.gitconfig is usually stored in the user.home directory. 12 Answers 12 ...
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Visual Studio: How to “Copy to Output Directory” without copying the folder structure?

I have a few dll files in \lib folder of my project folder. In the property page of dll, I have selected "Build Action" as "Content" and "Copy to Output Directory" as "Copy always". ...