php如何获取手机型号

iPhone UA：Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5
iPad UA：Mozilla/5.0 (iPad; CPU OS 7_0 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11A465 Safari/9537.53
Android UA：Mozilla/5.0 (Linux; U; Android 4.4.2; en-us; LGMS323 Build/KOT49I.MS32310c) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/30.0.1599.103 Mobile Safari/537.36

<?php
getOS();
function getOS()
{
	$ua = $_SERVER['HTTP_USER_AGENT'];//这里只进行IOS和Android两个操作系统的判断，其他操作系统原理一样
	if (strpos($ua, 'Android') !== false) {//strpos()定位出第一次出现字符串的位置，这里定位为0
		preg_match("/(?<=Android )[\d\.]{1,}/", $ua, $version);
		echo 'Platform:Android OS_Version:'.$version[0];
	} elseif (strpos($ua, 'iPhone') !== false) {
		preg_match("/(?<=CPU iPhone OS )[\d\_]{1,}/", $ua, $version);
		echo 'Platform:iPhone OS_Version:'.str_replace('_', '.', $version[0]);
	} elseif (strpos($ua, 'iPad') !== false) {
		preg_match("/(?<=CPU OS )[\d\_]{1,}/", $ua, $version);
		echo 'Platform:iPad OS_Version:'.str_replace('_', '.', $version[0]);
	} 
}
?>