php获取server端mac和clientmac的地址[通俗易懂]

<?php   
/**  
获取网卡的MAC地址原码；眼下支持WIN/LINUX系统  
获取机器网卡的物理（MAC）地址
**/   
class GetmacAddr{ 
    var $result = array(); // 返回带有MAC地址的字串数组 
    var $macAddr;
    /*构造*/
    function __construct($osType){ 
        switch ( strtolower($osType) ){ 
            case "unix": break;
            case "solaris": break;
            case "aix": break;
            case "linux": {
                $this->for_linux_os();
            }break; 
            default: { 
                $this->for_windows_os(); 
            }break; 
        } 
        $temp_array = array(); 
        foreach($this->result 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; 
    }
    /*linux系统中获取方法*/
    function for_linux_os(){ 
        @exec("ifconfig -a", $this->result); 
        return $this->result; 
    }
    /*win系统中的获取方法*/
    function for_windows_os(){ 
        @exec("ipconfig /all", $this->result); 
        if ( $this->result ) {
            return $this->result;
        } else { 
            $ipconfig = $_SERVER["WINDIR"]."\system32\ipconfig.exe";
            if(is_file($ipconfig)) {
                @exec($ipconfig." /all", $this->result);
            } else {
                @exec($_SERVER["WINDIR"]."\system\ipconfig.exe /all", $this->result);
                return $this->result; 
            }
        } 
    } 
} 
?>   

@exec("arp -a",$array); //运行arp -a命令，结果放到数组$array中
        foreach($array as $value){
            //匹配结果放到数组$mac_array
            if(strpos($value,$_SERVER["REMOTE_ADDR"]) && preg_match("/(:?[0-9A-F]{2}[:-]){5}[0-9A-F]{2}/i",$value,$mac_array)){
                $mac = $mac_array[0];
                break;
            }
        }
        echo $mac;