How reliable is the user-agent information in determining the operating system in PHP?

User-agent information is not always reliable for determining the operating system in PHP, as it can be easily manipulated by the user or browser. To accurately determine the operating system, it is recommended to use server-side methods such as PHP's `php_uname()` function, which returns the operating system name. 

$os = php_uname('s');
echo "Operating System: $os";

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user-agent information operating system reliability PHP

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