How to obtain client browser and operating system information in php

In a more intelligent program, PHP can obtain the client browser and operating system information, and then load different pages according to the browser and system type to provide more personalized services.

Let’s learn how to use php to obtain client browser and operating system information. Friends who are interested can refer to it.

1. The field ['HTTP_USER_AGENT'] in the PHP super global variable $_SERVER array obtains all the information of the accessing user
The following is a string obtained through $_SERVER['HTTP_USER_AGENT']:
Mozilla/5.0 (Windows; U ; Windows NT 6.1; en-US) AppleWebKit/533.2 (KHTML, like Gecko) Chrome/5.0.342.3 Safari/533.2

2. Use regular expressions to match the above string and the user's browser and operating system information.

3. PHP allocates the required CSS, JS, etc. based on the matched string (user’s browser operating system information), and returns it to the user

My browser and operating system information:
Browser: Chrome 5.0
Platform : Windows 7

A complete example is given below.
//Display the browser information of the visiting user
echo 'Browser: ' . determinebrowser($Agent) . '
';
//Display the operating system platform of the visiting user
echo 'Platform: ' . determineplatform($Agent). '
';

//link: http://www.jbxue.com
//Positive expression comparison and analysis of characters in $_SERVER['HTTP_USER_AGENT'] String to obtain the information of the visiting user's browser
function determinebrowser ($Agent) {
$browseragent=""; //Browser
$browserversion=""; //Browser version
if (ereg('MSIE ([ 0-9].[0-9]{1,2})',$Agent,$version)) {
$browserversion=$version[1];
$browseragent="Internet Explorer";
} else if ( ereg( 'Opera/([0-9]{1,2}.[0-9]{1,2})',$Agent,$version)) {
$browserversion=$version[1];
$ browseragent="Opera";
} else if (ereg( 'Firefox/([0-9.]{1,5})',$Agent,$version)) {
$browserversion=$version[1];
$browseragent="Firefox";
}else if (ereg( 'Chrome/([0-9.]{1,3})',$Agent,$version)) {
$browserversion=$version[1];
$browseragent="Chrome";
}
else if (ereg( 'Safari/([0-9.]{1,3})',$Agent,$version)) {
$browseragent="Safari";
$browserversion="";
}
else {
$browserversion="";
$browseragent="Unknown";
}
return $browseragent." ".$browserversion;
}

// Obtain access in the same way User's browser information
function determineplatform ($Agent) {
$browserplatform=='';
if (eregi('win',$Agent) && strpos($Agent, '95')) {
$browserplatform= "Windows 95";
}
elseif (eregi('win 9x',$Agent) && strpos($Agent, '4.90')) {
$browserplatform="Windows ME";
}
elseif (eregi('win ',$Agent) && ereg('98',$Agent)) {
$browserplatform="Windows 98";
}
elseif (eregi('win',$Agent) && eregi('nt 5.0',$Agent )) {
$browserplatform="Windows 2000";
}
elseif (eregi('win',$Agent) && eregi('nt 5.1',$Agent)) {
$browserplatform="Windows XP";
}
elseif (eregi('win',$Agent) && eregi('nt 6.0',$Agent)) {
$browserplatform="Windows Vista";
}
elseif (eregi('win',$Agent) && eregi ('nt 6.1',$Agent)) {
$browserplatform="Windows 7";
}
elseif (eregi('win',$Agent) && ereg('32',$Agent)) {
$browserplatform= "Windows 32";
}
elseif (eregi('win',$Agent) && eregi('nt',$Agent)) {
$browserplatform="Windows NT";
}elseif (eregi('Mac OS' ,$Agent)) {
$browserplatform="Mac OS";
}
elseif (eregi('linux',$Agent)) {
$browserplatform="Linux";
}
elseif (eregi('unix', $Agent)) {
$browserplatform="Unix";
}
elseif (eregi('sun',$Agent) && eregi('os',$Agent)) {
$browserplatform="SunOS";
}
elseif (eregi('ibm',$Agent) && eregi('os',$Agent)) {
$browserplatform="IBM OS/2";
}
elseif (eregi('Mac',$Agent) && eregi ('PC',$Agent)) {
$browserplatform="Macintosh"; 
} 
elseif (eregi('PowerPC',$Agent)) { 
$browserplatform="PowerPC"; 
} 
elseif (eregi('AIX',$Agent)) { 
$browserplatform="AIX"; 
} 
elseif (eregi('HPUX',$Agent)) { 
$browserplatform="HPUX"; 
} 
elseif (eregi('NetBSD',$Agent)) { 
$browserplatform="NetBSD"; 
} 
elseif (eregi('BSD',$Agent)) { 
$browserplatform="BSD"; 
} 
elseif (ereg('OSF1',$Agent)) { 
$browserplatform="OSF1"; 
} 
elseif (ereg('IRIX',$Agent)) { 
$browserplatform="IRIX"; 
} 
elseif (eregi('FreeBSD',$Agent)) { 
$browserplatform="FreeBSD"; 
} 
if ($browserplatform=='') {$browserplatform = "Unknown"; } 
return $browserplatform; 
} 
?>