How does PHP identify whether a computer or mobile phone is accessing the website_PHP Tutorial

How does PHP identify whether a website is accessed from a computer or a mobile phone?

It is becoming more and more popular to access websites through mobile phones. If we want to count the number of visits to the website through PC and mobile phones situation, or if we need to do some special processing for the mobile terminal, then we need to identify the client of the user who visits the website. The following example is a method of identifying whether the user is accessing the website from a computer or a mobile phone through PHP.

<?php
function isMobile(){ 
	$useragent=isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : '';
	$useragent_commentsblock=preg_match('|\(.*?\)|',$useragent,$matches)>0?$matches[0]:'';
	$mobile_os_list=array('Google Wireless Transcoder','Windows CE','WindowsCE','Symbian','Android','armv6l','armv5','Mobile','CentOS','mowser','AvantGo','Opera Mobi','J2ME/MIDP','Smartphone','Go.Web','Palm','iPAQ');
	$mobile_token_list=array('Profile/MIDP','Configuration/CLDC-','160×160','176×220','240×240','240×320','320×240','UP.Browser','UP.Link','SymbianOS','PalmOS','PocketPC','SonyEricsson','Nokia','BlackBerry','Vodafone','BenQ','Novarra-Vision','Iris','NetFront','HTC_','Xda_','SAMSUNG-SGH','Wapaka','DoCoMo','iPhone','iPod');
	$found_mobile=CheckSubstrs($mobile_os_list,$useragent_commentsblock)||CheckSubstrs($mobile_token_list,$useragent);
	if($found_mobile){ 
		return true;
	}else{ 
		return false;
	}
}
function CheckSubstrs($substrs,$text){ 
	foreach($substrs as $substr){
		if(false!==strpos($text,$substr)){ 
			return true;
		} 
		return false;
	}
}
if(isMobile()){
	echo '手机登录 m.phpernote.com';
}else{
	echo '电脑登录 www.phpernote.com';
}

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http://www.bkjia.com/PHPjc/882412.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/882412.htmlTechArticleHow does PHP identify whether a computer or mobile phone is accessing a website? Nowadays, accessing websites through mobile phones is becoming more and more popular. If we want statistics Let’s take a look at the number of visits to the website through PC and mobile phones...