PHP: 如果 Internet Explorer 6是789

You can do this via parsing the user-agent header:

http://php.about.com/od/learnphp/p/http_user_agent.htm

Be wary that this is not very reliable and can be trivially spoofed.

You can check the HTTP_USER_AGENT server variable. The user agent transfered by IE contains MSIE

if(strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false) { ... }

For specific versions you can extend your condition

if(strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE 6.') !== false) { ... }

Also see this related question.

'HTTP_USER_AGENT' Contents of the User-Agent: header from the current request, if there is one. This is a string denoting the user agent being which is accessing the page. A typical example is: Mozilla/4.5 [en] (X11; U; Linux 2.2.9 i586). Among other things, you can use this value with get_browser() to tailor your page's output to the capabilities of the user agent.

So I assume you'll be able to get the browser name/id from the $_SERVER["HTTP_USER_AGENT"] variable.

You can as well look into PHP's get_browser(); http://php.net/manual/en/function.get-browser.php

Maybe you'll find it useful for more features.

Here is a great resource for detecting browsers in php: http://php.net/manual/en/function.get-browser.php

Here is one of the examples that seems the simplest:

<?php
function get_user_browser()
{
$u_agent = $_SERVER['HTTP_USER_AGENT'];
$ub = '';
if(preg_match('/MSIE/i',$u_agent))
{
$ub = "ie";
}
elseif(preg_match('/Firefox/i',$u_agent))
{
$ub = "firefox";
}
elseif(preg_match('/Safari/i',$u_agent))
{
$ub = "safari";
}
elseif(preg_match('/Chrome/i',$u_agent))
{
$ub = "chrome";
}
elseif(preg_match('/Flock/i',$u_agent))
{
$ub = "flock";
}
elseif(preg_match('/Opera/i',$u_agent))
{
$ub = "opera";
}


return $ub;
}
?>

Then later in your code you could say something like

$browser = get_user_browser();
if($browser == "ie"){
//do stuff
}

PHP has a function called get_browser() that will return an object (or array if you so choose) with details about the users' browser and what it can do.

A simple look through gave me this code:

$browser = get_browser( null, true );
if( $browser['name'] == "Firefox" )
if( $browser['majorversion'] == 4 )
echo "You're using Firefox version 4!";

This is not a surefire way (as it reads from HTTP_USER_AGENT, which can be spoofed, and will sometimes be analyzed wrong by php), but it's the easiest one that you can find as far as I know.

This is what I ended up using a variation of, which checks for IE8 and below:

if (preg_match('/MSIE\s(?P<v>\d+)/i', @$_SERVER['HTTP_USER_AGENT'], $B) && $B['v'] <= 8) {
// Browsers IE 8 and below
} else {
// All other browsers
}

A version that will continue to work with both IE10 and IE11:

preg_match('/MSIE (.*?);/', $_SERVER['HTTP_USER_AGENT'], $matches);
if(count($matches)<2){
preg_match('/Trident\/\d{1,2}.\d{1,2}; rv:([0-9]*)/', $_SERVER['HTTP_USER_AGENT'], $matches);
}


if (count($matches)>1){
//Then we're using IE
$version = $matches[1];


switch(true){
case ($version<=8):
//IE 8 or under!
break;


case ($version==9 || $version==10):
//IE9 & IE10!
break;


case ($version==11):
//Version 11!
break;


default:
//You get the idea
}
}

I do this

$u = $_SERVER['HTTP_USER_AGENT'];


$isIE7  = (bool)preg_match('/msie 7./i', $u );
$isIE8  = (bool)preg_match('/msie 8./i', $u );
$isIE9  = (bool)preg_match('/msie 9./i', $u );
$isIE10 = (bool)preg_match('/msie 10./i', $u );


if ($isIE9) {
//do ie9 stuff
}

You could use something like this for different messages or div/css

<!--[if IE 6]>
<style type="text/css">
div.ie6 { display:block; }
</style>
<![endif]-->


<!--[if IE 7]>
<style type="text/css">
div.ie7 { display:block; }
</style>
<![endif]-->


<!--[if IE 8]>
<style type="text/css">
div.ie8 { display:block; }
</style>
<![endif]-->


<!--[if IE 9]>
message1
<![endif]-->


<!--[if !IE 6]>
message2
<![endif]-->


<!--[if lt IE 8]>
message3
<![endif]-->

OR use different div of css

<!--[if lte IE 8]>
<style type="text/css">
div.lteie8 { display:block; }
</style>
<![endif]-->


<!--[if gt IE 6]>
<style type="text/css">
div.gtie6 { display:block; }
</style>
<![endif]-->


<!--[if gte IE 6]>
<style type="text/css">
div.gteie6 { display:block; }
</style>
<![endif]-->

Here's a little php function I wrote that uses the regex directly from MSFT's suggested javascript sniffing code from this article: http://msdn.microsoft.com/en-us/library/ms537509(v=vs.85).aspx

/**
* Returns the version of Internet Explorer or false
*/
function isIE(){


$isIE = preg_match("/MSIE ([0-9]{1,}[\.0-9]{0,})/",$_SERVER['HTTP_USER_AGENT'],$version);
if($isIE){
return $version[1];
}
return $isIE;


}

A tridend based approach would be better. Here is a quick function for checking IE 8.

<?php
function is_IE8(){
if(strpos(str_replace(' ', '', $_SERVER['HTTP_USER_AGENT']),'Trident/4.0')!== FALSE){
return TRUE;
};
return FALSE;
}
?>

Checking for MSIE only is not enough to detect IE. You need also "Trident" which is only used in IE11. So here is my solution which worked an versions 8 to 11.

$agent=strtoupper($_SERVER['HTTP_USER_AGENT']);
$isIE=(strpos($agent,'MSIE')!==false || strpos($agent,'TRIDENT')!==false);

Notice the case in 'Trident':

if (isset($_SERVER['HTTP_USER_AGENT']) &&
((strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false) || strpos($_SERVER['HTTP_USER_AGENT'], 'Trident') !== false)) {
// IE is here :-(
}

if you have Internet Explorer 11 and it's running over a touch screen pc, you must use: preg_match('/Trident/7.0; Touch; rv:11.0/', $_SERVER['HTTP_USER_AGENT']) instead of: preg_match('/Trident/7.0; rv:11.0/', $_SERVER['HTTP_USER_AGENT'])

if (isset($_SERVER['HTTP_USER_AGENT']) && preg_match("/(?i)msie|trident|edge/",$_SERVER['HTTP_USER_AGENT'])) {
// eh, IE found
}

but still useful - and works with IE11 ! here is another short way to get the common browsers returned for css class:

function get_browser()
{
$browser = '';
$ua = strtolower($_SERVER['HTTP_USER_AGENT']);
if (preg_match('~(?:msie ?|trident.+?; ?rv: ?)(\d+)~', $ua, $matches)) $browser = 'ie ie'.$matches[1];
elseif (preg_match('~(safari|chrome|firefox)~', $ua, $matches)) $browser = $matches[1];


return $browser;
}

So this function returns: 'safari' or 'firefox' or 'chrome', or 'ie ie8', 'ie ie9', 'ie ie10', 'ie ie11'.

hope it helps