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Tactics for using PHP in a high-load site

Before you answer this I have never developed anything popular enough to attain high server loads. Treat me as (sigh) an alien that has just landed on the planet, albeit one that knows PHP and a few optimisation techniques. ...
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What is the difference between a reference type and value type in c#?

Some guy asked me this question couple of months ago and I couldn't explain it in detail. What is the difference between a reference type and a value type in C#? ...
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What is Express.js?

... This is over simplifying it, but Express.js is to Node.js what Ruby on Rails or Sinatra is to Ruby. Express 3.x is a light-weight web application framework to help organize your web application into an MVC architecture on the ...
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What HTTP status response code should I use if the request is missing a required parameter?

... the request entity (hence a 415(Unsupported Media Type) status code is inappropriate), and the syntax of the request entity is correct (thus a 400 (Bad Request) status code is inappropriate) but was unable to process the contained instructions. For example, this error condi...
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What is the difference between precision and scale?

What is the difference between precision and scale in Oracle? In tutorials they usually leave scale empty and set precision to 6 when creating a primary key. ...
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Concatenating null strings in Java [duplicate]

...n Operator +", leading to JLS 8, § 5.1.11 "String Conversion", requires this operation to succeed without failure: ...Now only reference values need to be considered. If the reference is null, it is converted to the string "null" (four ASCII characters n, u, l, l). Otherwise, the conversion is ...
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isset() and empty() - what to use

... you help me to improve my coding style?:) In some tasks I need to check - is variable empty or contains something. To solve this task, I usually do the following. ...
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Why do we check up to the square root of a prime number to determine if it is prime?

To test whether a number is prime or not, why do we have to test whether it is divisible only up to the square root of that number? ...
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Difference between fprintf, printf and sprintf?

Can anyone explain in simple English about the differences between printf , fprintf , and sprintf with examples? 8 Ans...
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How can I obfuscate (protect) JavaScript? [closed]

... want to make a JavaScript application that's not open source, and thus I wish to learn how to can obfuscate my JS code? Is this possible? ...