<?php   
class MacAddr 
{   
    public $returnArray = array();    
    public $macAddr;   

    function __contruct($os_type=null){ 
        if(is_null($os_type)) $os_type = PHP_OS;   
        switch (strtolower($os_type)){   
        case "linux":   
            $this->forLinux();   
            break;   
        case "solaris":   
            break;   
        case "unix":   
            break;   
        case "aix":   
            break;   
        default:   
            $this->forWindows();   
            break;   
        }   
        $temp_array = array();   
        foreach($this->returnArray as $value ){   
            if(preg_match("/[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f]/i", $value, $temp_array)){   
                $this->macAddr = $temp_array[0];   
                break;   
            }   
        }   
        unset($temp_array);   
        return $this->macAddr;   
    } 

    function forWindows(){   
        @exec("ipconfig /all", $this->returnArray);   
        if($this->returnArray)   
            return $this->returnArray;   
        else{   
            $ipconfig = $_SERVER["WINDIR"]."system32ipconfig.exe";   
            if (is_file($ipconfig))   
                @exec($ipconfig." /all", $this->returnArray);   
            else  
                @exec($_SERVER["WINDIR"]."systemipconfig.exe /all", $this->returnArray);   
            return $this->returnArray;   
        }   
    } 

    function forLinux(){   
        @exec("ifconfig -a", $this->returnArray);   
        return $this->returnArray;   
    }   
}   

$mac = new MacAddr(PHP_OS);   
echo $mac->macAddr;   
echo "<br />"; 

// 获取客户端 
// linux 
$command = "arp -a {$_SERVER['REMOTE_ADDR']}"; 
echo $command; 
echo "<br />"; 
$result=`{$command}`;  

// windows 
$command = "nbtstat -a {$_SERVER['REMOTE_ADDR']}"; 
echo $command; 
echo "<br />"; 
$result=`{$command}`;  
print_r($result);   
?>