This advice is incorrect I believe.  PHP_OS will return the OS PHP is
running on, not what the OS of the client.

>From the manual:

PHP_OS The name of the operating system on which the PHP parser is
executing; e.g. 'Linux'. 

$HTTP_USER_AGENT (if you're using Apache with PHP) should do what you need.

Josh Hoover
KnowledgeStorm, Inc.

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> > How can I detect client's OS/platform with PHP? (Win, Mac, etc.)
> with PHP_OS. $os = PHP_OS;
> See "Chapter 8 - Constants" of the manual.

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