检查字符串和用户代理 [英] Check String and User Agent

问题描述

我正在尝试设置一个PHP代码段，该代码段检查是否满足2个条件，如果满足，它将回显一些文本.条件是:

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:

1. 查询字符串等于某个值.
2. 该浏览器是Firefox.

它正在正确检查查询字符串，但它似乎不适用于浏览器(用户代理).见下文:

It's checking the query string properly but, it doesnt seem to be working for the browser (user agent). See below:

<?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 '';
}

?> 

任何帮助将不胜感激.

推荐答案

这就是我要检查的东西:

This is what i do to check out that stuff:

if(strlen(strstr($_SERVER['HTTP_USER_AGENT'],"Firefox")) <= 0 ){ // if not firefox

  //do something

}

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 '';
}

这篇关于检查字符串和用户代理的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！