Extraire le système d'exploitation à partir de l'entête HTTP reçu...
... À appeler sans arguments
Extract the operating system from the received HTTP header...
... Call without arguments.
HTTP استخراج نظام التشغيل من رأس الطلب 
تنادى بدون معطيات
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<?
//#################################################
// find more codes on scripts-n-codes.blogspot.com
//#################################################
function extract_os() {
 $user_parts = explode(";", $_SERVER['HTTP_USER_AGENT']);
 $os = trim($user_parts[2]);
 $os = str_replace(')', '', $os);
 if($os == '') $os = 'unknown';
 return $os;  
}
?>