what is Header() function in PHP?

what is Header() function in PHP and For what is this function used in PHP language?

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Check this: http://php.net/manual/en/function.header.php

The header() function sends a raw HTTP header to a client.

It is important to notice that header() must be called before any actual output is sent.
Syantax: header(string,replace,http_response_code)

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