如何在 PHP 中执行浏览器检测 - IE（版本）
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How to perform Browser detection - IE (versions) in PHP
提问by Joselito
I found this code to detect the browser via php:
我发现这段代码可以通过 php 检测浏览器：
<?php
$msie = strpos($_SERVER["HTTP_USER_AGENT"], 'MSIE') ? true : false;
$firefox = strpos($_SERVER["HTTP_USER_AGENT"], 'Firefox') ? true : false;
$safari = strpos($_SERVER["HTTP_USER_AGENT"], 'Safari') ? true : false;
$chrome = strpos($_SERVER["HTTP_USER_AGENT"], 'Chrome') ? true : false;
?>
<?php
//Firefox
if ($firefox) {
echo 'you are using Firefox!';
echo '<br />';
}
// Safari or Chrome. Both use the same engine - webkit
if ($safari || $chrome) {
echo 'you are using a webkit powered browser';
echo '<br />';
}
// IE
if ($msie) {
echo '<br>you are using Internet Explorer<br>';
echo '<br />';
}?>
But the code does not include the possible versions of IE. Did something like this:
但代码不包括可能的 IE 版本。做了这样的事情：
// IE7
if ($msie7) {
echo '<br>you are using Internet Explorer 7<br>';
echo '<br />';
}
Could someone help me with this? Wanted to improve the code including support IE ??versions.
有人可以帮我解决这个问题吗？想要改进代码，包括支持 IE 版本。
回答by Ferrakkem Bhuiyan
Try this:
尝试这个：
<?php
$ie6 = (ereg("MSIE 6", $_SERVER["HTTP_USER_AGENT"])) ? true : false;
$ie7 = (ereg("MSIE 7", $_SERVER["HTTP_USER_AGENT"])) ? true : false;
$ie8 = (ereg("MSIE 8", $_SERVER["HTTP_USER_AGENT"])) ? true : false;
if ($ie6 || $ie7 || $ie8) {
// Do fallback stuff that old browsers can do here
echo "You are using IE";
} else {
// Do stuff that real browsers can handle here
}
?>
回答by Carles Solà
This PHP function works perfectly. But I do not know how to make PHP discriminate between the different versions of "MSIE"
这个 PHP 函数完美运行。但我不知道如何让 PHP 区分不同版本的“MSIE”
<?php
if ( strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') ){
header( 'Location: http://www.domain.com' ) ;
}
?>
Very Thanks
很感谢
回答by MonkeyZeus
There is no reliable way for PHP to know, nor care, which browser is calling upon it. By design, server-side languages have no reason to consider what browser you are using before executing code. $_SERVER['HTTP_USER_AGENT']is a shim at best and changes so frequently that you are bound to have it screw you over sooner rather than later.
PHP 没有可靠的方法来知道或关心哪个浏览器正在调用它。按照设计，服务器端语言在执行代码之前没有理由考虑您使用的是什么浏览器。$_SERVER['HTTP_USER_AGENT']充其量只是一个垫片，而且变化如此频繁，以至于您迟早会被它搞砸。
Your only goal as a web developer should be to write both CSS and JS code which is either cross-browser compatible or use a conditional <!--[if IE 8]><![endif]-->shim which has apparently been dropped by IE11 anyways...
作为 Web 开发人员，您唯一的目标应该是编写跨浏览器兼容的 CSS 和 JS 代码，或者使用<!--[if IE 8]><![endif]-->显然已被 IE11 删除的条件垫片...
In JS you need to check if a function exists before calling it or figure out if the JS engine which supports it is available within your browser target scope.
在 JS 中，您需要在调用一个函数之前检查它是否存在，或者确定支持它的 JS 引擎是否在您的浏览器目标范围内可用。
With that being said, yes there are libraries out there which attempt to decipher $_SERVER['HTTP_USER_AGENT']but the information source is flawed in the first place so the library is useless from the moment you try using it.
话虽如此，是的，有些图书馆试图破译，$_SERVER['HTTP_USER_AGENT']但信息源首先存在缺陷，因此从您尝试使用它的那一刻起，图书馆就毫无用处。
Here is some cross-browser CSS:
这是一些跨浏览器的 CSS：
.someClass{
-webkit-box-shadow: 0 0 5px black;
-moz-box-shadow: 0 0 5px black;
box-shadow: 0 0 5px black;
-webkit-transform: rotate(45deg);
-moz-transform: rotate(45deg);
-ms-transform: rotate(45deg);
-o-transform: rotate(45deg);
transform: rotate(45deg);
-webkit-border-radius: 4px;
-moz-border-radius: 4px;
border-radius: 4px;
/* IE supports nothing above? Too bad, it will ignore it */
}
