PHP获取服务器的mac地址类

<?php
/**
 * 获取网卡的MAC地址，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();
    var $mac_addr;

    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;
    }

    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;
        }
    }

    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;

?>