'$_POST vs. $HTTP_RAW_POST_DATA vs file_get_contents(php://input)? [duplicate]

Possible Duplicate:
What’s the difference between POST and raw POST in PHP at all?

For a better understanding, I would be grateful if you would explain what are the fundamental differences between $_POST, $HTTP_RAW_POST_DATA and file_get_contents(php://input).

When to use which, and why?

php


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