php 检查字符串和用户代理
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Check String and User Agent
提问by Batfan
I am trying to setup a PHP snippet that checks if 2 conditions are met and if they are, it echoes some text. The conditions are:
我正在尝试设置一个 PHP 代码段，以检查是否满足 2 个条件，如果满足，它会回显一些文本。条件是：
- That the query string equals a certain value.
- That the browser is Firefox.
- 查询字符串等于某个值。
- 那个浏览器是火狐。
It's checking the query string properly but, it doesnt seem to be working for the browser (user agent). See below:
它正在正确检查查询字符串，但是它似乎不适用于浏览器（用户代理）。见下文：
<?php
function get_user_browser()
{
$u_agent = $_SERVER['HTTP_USER_AGENT'];
$ub = '';
if(preg_match('/Firefox/i',$u_agent))
{
$ub = "firefox";
}
else
{
$ub = "other";
}
}
if (isset($_GET['print']) && $_GET['print'] != "" && $ub = 'firefox')
{
$pg = $_GET['print'];
if (!file_exists('1'))
{
echo '<b>It worked!</b>';
}
}
else
{
echo '';
}
?>
Any help would be appreciated.
任何帮助，将不胜感激。
回答by Naftali aka Neal
This is what i do to check out that stuff:
这就是我检查这些东西的方法：
if(strlen(strstr($_SERVER['HTTP_USER_AGENT'],"Firefox")) <= 0 ){ // if not firefox
//do something
}
And added into your code:
并添加到您的代码中：
function get_user_browser()
{
$u_agent = $_SERVER['HTTP_USER_AGENT'];
$ub = '';
if(strlen(strstr($u_agent,"Firefox")) > 0 ){
$ub = 'firefox';
}
else {
$ub = 'other';
}
return $ub;
}
if (isset($_GET['print']) && $_GET['print'] != ""
&& get_user_browser() == 'firefox')
{
$pg = $_GET['print'];
if (!file_exists('1'))
{
echo '<b>It worked!</b>';
}
}
else
{
echo '';
}
回答by Fayyaz Ali
Here is what i use;
这是我使用的；
function getBrowser()
{
$u_agent = $_SERVER['HTTP_USER_AGENT'];
$bname = 'Unknown';
$platform = 'Unknown';
$version= "";
//First get the platform?
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)) {
$platform = 'windows';
}
// Next get the name of the useragent yes seperately and for good reason
if(preg_match('/MSIE/i',$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";
}
// finally get the correct version number
$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
}
// see how many we have
$i = count($matches['browser']);
if ($i != 1) {
//we will have two since we are not using 'other' argument yet
//see if version is before or after the name
if (strripos($u_agent,"Version") < strripos($u_agent,$ub)){
$version= $matches['version'][0];
}
else {
$version= $matches['version'][1];
}
}
else {
$version= $matches['version'][0];
}
// check if we have a number
if ($version==null || $version=="") {$version="?";}
return array(
'userAgent' => $u_agent,
'name' => $bname,
'version' => $version,
'platform' => $platform,
'pattern' => $pattern
);
}
you can also have a look at;
你也可以看看;
回答by Fayyaz Ali
I can't see your code calling the function, and thus $ub doesn't work in your condition.
我看不到您调用该函数的代码，因此 $ub 在您的情况下不起作用。
<?php
$u_agent = $_SERVER['HTTP_USER_AGENT'];
$ub = 'other';
if(preg_match('/Firefox/i',$u_agent))
{
$ub = "firefox";
}
if (isset($_GET['print']) && $_GET['print'] != "" && $ub == 'firefox') {
$pg = $_GET['print'];
if (!file_exists('1')) {
echo '<b>It worked!</b>';
}
}
else {
echo '';
}
?>
