PHP读取网卡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;  
	 }  
         
    }  
 
 $mac = new GetMacAddr(PHP_OS);  
 
 echo $mac->mac_addr;