Finding out the OS my PHP script is run on [duplicate]

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How to get the OS on which PHP is running?

I need my script to be able to recognize whether it's being run on a Windows or on a Linux system so it can behave accordingly. How do I do that?

EDIT: I need a definite way of doing that, that has no risk of recognizing the wrong OS.

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php_uname and/or the PHP_OS constant will tell you. See the examples here: http://www.php.net/manual/en/function.php-uname.php

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if (PHP_OS == 'Linux') echo 'Linux os!'

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predefined constant: PHP_OS ........

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Have you looked at the php_uname() function?

http://us.php.net/manual/en/function.php-uname.php

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Here is the second link if I google 'os php':

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Note that anything that comes from the browser to your code can be spoofed, so it's not 'definite'.