js 和 php 判断是否是 android 设备

if(navigator.userAgent.match(/Android/i)) {  
	    alert('Is Android !');  
	} else {  
	    alert('Is Not Android !');  
	} 

if(strstr($_SERVER['HTTP_USER_AGENT'],'Android')) {  
	    echo 'Is Android !';  
	} else {  
	    echo 'Is Not Android !';  
	} 

function browsers(){ 
	   global $HTTP_USER_AGENT ; 
	   if (isset($HTTP_USER_AGENT)){ 
	    $sAgent = $HTTP_USER_AGENT; 
	   }else{ 
	    $sAgent = $_SERVER['HTTP_USER_AGENT']; 
	   } 
	   if (strpos($sAgent,'MSIE') !== false && strpos($sAgent,'mac') === false && strpos($sAgent,'Opera') === false){ 
	    $iVersion = (float)substr($sAgent,strpos($sAgent,'MSIE') + 5,3); 
	    return ($iVersion >= 5.5) ; 
	   }else if (strpos($sAgent,'Gecko/') !== false){ 
	    $iVersion = (int)substr($sAgent,strpos($sAgent,'Gecko/') + 6,8); 
	    return ($iVersion >= 20030210) ; 
	   }else{ 
	    return false; 
	   } 
	  }