获取网卡的MAC地址原码,支持WIN/LINUX系统

<?php
/**
* 获取网卡的MAC地址原码；目前支持WIN/LINUX系统
* 获取机器网卡的物理（MAC）地址
*/
class GetMacAddr
{
    var $return_array = array(); // 返回带有MAC地址的字串数组
    var $mac_addr;
    public function GetMacAddr($os_type)
    {
        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->return_array 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->mac_addr = $temp_array[0];
                break;
            }
        }
        unset($temp_array);
        return $this->mac_addr;
    }  
 
    public function forWindows()
    {
        @exec("ipconfig /all", $this->return_array);
        if ( $this->return_array )
            return $this->return_array;
        else
        {
            $ipconfig = $_SERVER["WINDIR"]."\system32\ipconfig.exe";
            if ( is_file($ipconfig) )
                @exec($ipconfig." /all", $this->return_array);
            else
                @exec($_SERVER["WINDIR"]."\system\ipconfig.exe /all", $this->return_array);
            return $this->return_array;
        }
    }  
 
    public function forLinux()
    {
        @exec("ifconfig -a", $this->return_array);
        return $this->return_array;
    }
}
//方法使用
$mac = new GetMacAddr(PHP_OS);
echo $mac->mac_addr;