PHP $_server[' http_user_agent ']

Get Browser function Getbrowse () {Global $_server;    $Agent = $_server[' http_user_agent ');    $browseinfo = ";    if (Ereg (' Mozilla ', $Agent) &&!ereg (' MSIE ', $Agent)) {$browseinfo = ' Netscape Navigator ';    } if (Ereg (' opera ', $Agent)) {$browseinfo = ' opera ';    } if (Ereg (' Mozilla ', $Agent) && ereg (' MSIE ', $Agent)) {$browseinfo = ' Internet Explorer ';    } if (Ereg (' Chrome ', $Agent)) {$browseinfo = "chrome";    } if (Ereg (' Safari ', $Agent)) {$browseinfo = "safari";    } if (Ereg (' Firefox ', $Agent)) {$browseinfo = "Firefox"; } return $browseinfo;}    Get Ipfunction GetIP () {Global $_server;    if (getenv (' http_client_ip ')) {$ip = getenv (' http_client_ip ');    } else if (getenv (' http_x_forwarded_for ')) {$ip = getenv (' http_x_forwarded_for ');    } else if (getenv (' remote_addr ')) {$ip = getenv (' remote_addr ');    } else {$ip = $_server[' remote_addr '); } return $IP;} Gets the user system function Getos () {Global $_server;    $agent = $_server[' http_user_agent ');    $os = false;    if (' Win ', $agent) && strpos ($agent, ' eregi ') {$os = ' Windows 95 ';    }elseif (Eregi (' Win 9x ', $agent) && strpos ($agent, ' 4.90 ')) {$os = ' Windows ME ';    }elseif (eregi (' win ', $agent) && ereg (' 98 ', $agent)) {$os = ' Windows 98 ';    }elseif (eregi (' win ', $agent) && eregi (' NT 5.1 ', $agent)) {$os = ' Windows XP ';    }elseif (eregi (' win ', $agent) && eregi (' NT 5.2 ', $agent)) {$os = ' Windows 2003 ';    }elseif (eregi (' win ', $agent) && eregi (' NT 5 ', $agent)) {$os = ' Windows 2000 ';    }elseif (eregi (' win ', $agent) && eregi (' NT ', $agent)) {$os = ' Windows nt ';    }elseif (eregi (' win ', $agent) && ereg (' + ', $agent)) {$os = ' Windows 32 ';    }elseif (eregi (' Linux ', $agent)) {$os = ' Linux ';    }elseif (eregi (' Unix ', $agent)) {$os = ' Unix '; }elseif (Eregi (' Sun ', $agent) &&    Eregi (' OS ', $agent)) {$os = ' SunOS ';    }elseif (eregi (' IBM ', $agent) && eregi (' OS ', $agent)) {$os = ' IBM OS/2 ';    }elseif (eregi (' Mac ', $agent) && eregi (' PC ', $agent)) {$os = ' Macintosh ';    }elseif (eregi (' PowerPC ', $agent)) {$os = ' PowerPC ';    }elseif (eregi (' Aix ', $agent)) {$os = ' Aix ';    }elseif (eregi (' HPUX ', $agent)) {$os = ' HPUX ';    }elseif (eregi (' NetBSD ', $agent)) {$os = ' NetBSD ';    }elseif (eregi (' BSD ', $agent)) {$os = ' BSD ';    }elseif (Ereg (' OSF1 ', $agent)) {$os = ' OSF1 ';    }elseif (Ereg (' IRIX ', $agent)) {$os = ' IRIX ';    }elseif (eregi (' FreeBSD ', $agent)) {$os = ' FreeBSD ';    }elseif (eregi (' teleport ', $agent)) {$os = ' teleport ';    }elseif (eregi (' FlashGet ', $agent)) {$os = ' flashget ';    }elseif (eregi (' Webzip ', $agent)) {$os = ' webzip ';    }elseif (eregi (' Offline ', $agent)) {$os = ' offline ';    }else{$os = ' Unknown '; } return $os;} 

PHP $_server[' http_user_agent ']