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PHP “php://input” vs $_POST

I have been directed to use the method php://input instead of $_POST when interacting with Ajax requests from JQuery. What I do not understand is the benefits of using this vs the global method of $_POST or $_GET . ...
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How does database indexing work? [closed]

Given that indexing is so important as your data set increases in size, can someone explain how indexing works at a database-agnostic level? ...
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Homebrew install specific version of formula?

How do I install a specific version of a formula in homebrew? For example, postgresql-8.4.4 instead of the latest 9.0. 27 ...
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How much of a git sha is *generally* considered necessary to uniquely identify a change in a given c

If you're going to build, say, a directory structure where a directory is named for a commit in a Git repository, and you want it to be short enough to make your eyes not bleed, but long enough that the chance of it colliding would be negligible, how much of the SHA substring is generally required? ...
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My attempt at value initialization is interpreted as a function declaration, and why doesn't A a(())

Among the many things Stack Overflow has taught me is what is known as the "most vexing parse", which is classically demonstrated with a line such as ...
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Difference between sh and bash

When writing shell programs, we often use /bin/sh and /bin/bash . I usually use bash , but I don't know what's the difference between them. ...
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What are the best PHP input sanitizing functions?

I am trying to come up with a function that I can pass all my strings through to sanitize. So that the string that comes out of it will be safe for database insertion. But there are so many filtering functions out there I am not sure which ones I should use/need. ...
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Reverse a string in Python

There is no built in reverse function for Python's str object. What is the best way of implementing this method? 28 Ans...
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Difference between DateTime and Time in Ruby

What's the difference between DateTime and Time classes in Ruby and what factors would cause me to choose one or the other? ...
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Fastest sort of fixed length 6 int array

Answering to another Stack Overflow question ( this one ) I stumbled upon an interesting sub-problem. What is the fastest way to sort an array of 6 integers? ...