PHP 根据客户端系统自动跳转

客户有一个网站，需要如果用户是手机（平板），需要访问m.ileiming.com，如果用数用的PC浏览器，需要访问www.ileiming.com。当然这个在nginx上是可以做的，现在我们通过php来实现这个需求。

< ?php
	function is_mobile(){
	     $regex_match="/(nokia|iphone|android|motorola|^mot\-|softbank|foma|docomo|kddi|up\.browser|up\.link|";
	     $regex_match.="htc|dopod|blazer|netfront|helio|hosin|huawei|novarra|CoolPad|webos|techfaith|palmsource|";
	     $regex_match.="blackberry|alcatel|amoi|ktouch|nexian|samsung|^sam\-|s[cg]h|^lge|ericsson|philips|sagem|wellcom|bunjalloo|maui|";
	     $regex_match.="symbian|smartphone|midp|wap|phone|windows ce|iemobile|^spice|^bird|^zte\-|longcos|pantech|gionee|^sie\-|portalmmm|";
	     $regex_match.="jig\s browser|hiptop|^ucweb|^benq|haier|^lct|opera\s*mobi|opera\*mini|320x320|240x320|176x220";
	     $regex_match.=")/i";
	     return isset($_SERVER['HTTP_X_WAP_PROFILE']) or isset($_SERVER['HTTP_PROFILE']) or preg_match($regex_match, strtolower($_SERVER['HTTP_USER_AGENT']));
	}
	if(is_mobile())
	{
		if($_SERVER['HTTP_HOST'] != 'm.ileiming.com')
		{
			header( "HTTP/1.1 302 Moved Permanently");  
	       header("Location: http://m.ileiming.com/".$_SERVER['REQUEST_URI']);
		}
	} else
	{
		if($_SERVER['HTTP_HOST'] != 'www.ileiming.com' && $_SERVER['HTTP_HOST'] != 'ileiming.com')
		{
			header( "HTTP/1.1 302 Moved Permanently"); 
	        header("Location: http://www.ileiming.com/".$_SERVER['REQUEST_URI']); 
		}
	}
?>