刚刚 一直把$_SERVER以为是js的，所以调试一直不成功

原来$_SERVER是php的

那么通过php来判断手机版本就很好办了，而且基本上不会出现什么错误

相关代码如下

php函数：

<?php 
	function is_mobile_request()  
	{  
 		$_SERVER['ALL_HTTP'] = isset($_SERVER['ALL_HTTP']) ? $_SERVER['ALL_HTTP'] : '';  
 		$mobile_browser = '0';  
 		if(preg_match('/(up.browser|up.link|mmp|symbian|smartphone|midp|wap|phone|iphone|ipad|ipod|android|xoom)/i', strtolower($_SERVER['HTTP_USER_AGENT'])))  
  			$mobile_browser++;  
 		if((isset($_SERVER['HTTP_ACCEPT'])) && (strpos(strtolower($_SERVER['HTTP_ACCEPT']),'application/vnd.wap.xhtml+xml') !== false))  
  			$mobile_browser++;  
 		if(isset($_SERVER['HTTP_X_WAP_PROFILE']))  
  			$mobile_browser++;  
 		if(isset($_SERVER['HTTP_PROFILE']))  
  			$mobile_browser++;  
 		$mobile_ua = strtolower(substr($_SERVER['HTTP_USER_AGENT'],0,4));  
 		$mobile_agents = array(  
			'w3c ','acs-','alav','alca','amoi','audi','avan','benq','bird','blac',  
    		'blaz','brew','cell','cldc','cmd-','dang','doco','eric','hipt','inno',  
    		'ipaq','java','jigs','kddi','keji','leno','lg-c','lg-d','lg-g','lge-',  
    		'maui','maxo','midp','mits','mmef','mobi','mot-','moto','mwbp','nec-',  
    		'newt','noki','oper','palm','pana','pant','phil','play','port','prox',  
    		'qwap','sage','sams','sany','sch-','sec-','send','seri','sgh-','shar',  
    		'sie-','siem','smal','smar','sony','sph-','symb','t-mo','teli','tim-',  
    	'tosh','tsm-','upg1','upsi','vk-v','voda','wap-','wapa','wapi','wapp',  
    	'wapr','webc','winw','winw','xda','xda-'
    	);  
 	if(in_array($mobile_ua, $mobile_agents))  
  		$mobile_browser++;  
 	if(strpos(strtolower($_SERVER['ALL_HTTP']), 'operamini') !== false)  
  		$mobile_browser++;  
 	// Pre-final check to reset everything if the user is on Windows  
 	if(strpos(strtolower($_SERVER['HTTP_USER_AGENT']), 'windows') !== false)  
  		$mobile_browser=0;  
 	// But WP7 is also Windows, with a slightly different characteristic  
 	if(strpos(strtolower($_SERVER['HTTP_USER_AGENT']), 'windows phone') !== false)  
  		$mobile_browser++;  
 	if($mobile_browser>0)  
  		return true;  
 	else
  	return false;
}
?>

<?php
	if(is_mobile_request()){
?>
        代码片段二
<?php
	}else{
?>
	代码片段一
<?php
	}
?>