PHP环境变量: HTTP_USER_AGENT

今天小编分析一下PHP环境变量: HTTP_USER_AGENT, 它标识用户的浏览器和操作系统。

[code]$u_agent = $_SERVER['HTTP_USER_AGENT'];//标识用户的浏览器和操作系统
$bname = 'Unknown';
$platform = 'Unknown';
$version = "";

if (preg_match('/linux/i', $u_agent)) {
$platform = 'linux';
}elseif (preg_match('/macintosh|mac os x/i', $u_agent)) {
$platform = 'mac';
}elseif (preg_match('/windows|win32/i', $u_agent)) {
$platform = 'windows';
}

if(preg_match('/MSIE/i',$u_agent) && !preg_match('/Opera/i',$u_agent)) {
$bname = 'Internet Explorer';
$ub = "MSIE";
} elseif(preg_match('/Firefox/i',$u_agent)) {
$bname = 'Mozilla Firefox';
$ub = "Firefox";
} elseif(preg_match('/Chrome/i',$u_agent)) {
$bname = 'Google Chrome';
$ub = "Chrome";
}elseif(preg_match('/Safari/i',$u_agent)) {
$bname = 'Apple Safari';
$ub = "Safari";
}elseif(preg_match('/Opera/i',$u_agent)) {
$bname = 'Opera';
$ub = "Opera";
}elseif(preg_match('/Netscape/i',$u_agent)) {
$bname = 'Netscape';
$ub = "Netscape";
}

$known = array('Version', $ub, 'other');
$pattern = '#(?<browser>' . join('|', $known) . ')[/ ]+(?<version>[0-9.|a-zA-Z.]*)#';

if (!preg_match_all($pattern, $u_agent, $matches)) {
// we have no matching number just continue
}

$i = count($matches['browser']);

if ($i != 1) {
if (strripos($u_agent,"Version") < strripos($u_agent,$ub)){
$version= $matches['version'][0];
}else {
$version= $matches['version'][1];
}
}else {
$version= $matches['version'][0];
}
if ($version == null || $version == "") {$version = "?";}
$arrInfo = array(
'userAgent' => $u_agent,	//
'name'      => $bname,		//浏览器名称
'version'   => $version,	//版本
'platform'  => $platform,	//操作系统
'pattern'   => $pattern,	//验证规则
);
echo '<pre>';print_r($arrInfo);exit;

输出结果:

Array
(
[userAgent] => Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.62 Safari/537.36
[name] => Google Chrome
[version] => 62.0.3202.62
[platform] => windows
[pattern] => #(?Version|Chrome|other)[/ ]+(?[0-9.|a-zA-Z.]*)#
)