php获取网卡的MAC地址支持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; 

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; //这里是机器的真实MAC地址，请注释掉 
?>