PHP中获得mac地址

<?php
class GetMacAddr {
var $return_array = array();
// 返回带有MAC地址的字串数组
var $mac_addr = array();

function GetMacAddr() {
switch (strtolower(PHP_OS) ) {
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[] = $temp_array[0];
}
}
unset($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;
}

}

$mac = new GetMacAddr();
//var_dump($mac);
print_r($mac -> mac_addr);