php随机生成MAC地址

php随机生成MAC地址代码，前三个为固定mac头，根据要用的更改

function mac_gen(){
	$array=array(
		0x1C,
		0x1C,
		0x1C,
		mt_rand(0x00, 0x7f),
		mt_rand(0x00, 0xff),
		mt_rand(0x00, 0xff)
	);
	return join(':',array_map(function($v){
		return sprintf("%02X",$v);
	},$array));
}