PHP脚本可以在一台服务器上运行，但不能在另一台服务器上运行

Question

我有一种感觉，因为安装的PHP版本不同。没有正确执行代码的服务器正在运行PHP版本4.3.9。

以下是无法使用的代码部分。

// Function to find browser name 
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'; 
     $ub = "Netscape"; 
    } 
    elseif(preg_match('/Android/i',$u_agent)) 
    { 
     $bname = 'Android'; 
     $ub = "Android"; 
    } 
    elseif(preg_match('/iPad/i',$u_agent)) 
    { 
     $bname = 'iPad'; 
     $ub = "iPad"; 
    } 
    elseif(preg_match('/iPhone/i',$u_agent)) 
    { 
     $bname = 'iPhone'; 
     $ub = "iPhone"; 
    } 
    elseif(preg_match('/BlackBerry/i',$u_agent)) 
    { 
     $bname = 'BlackBerry'; 
     $ub = "BlackBerry"; 
    } 
    // 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 
    ); 
} 

// now try it 
$ua=getBrowser(); 
// Make browser and variables readable 
$browser = $ua['name'] . " v" . $ua['version']; 
$user_agent = $ua['userAgent']; 

编辑：澄清，这里是输出错误消息（感谢抬起头）

警告：编译失败：无法识别的字符之后（<在在/ var偏移3/WWW/vhosts/staging.xxxxxxxxx.com/httpdocs/feedback/feedback-accept.php on line 150

注意：未定义索引：浏览器位于/var/www/vhosts/staging.xxxxxxxxx.com/httpdocs/feedback/feedback- 155线上的accept.php

致命错误：调用未定义功能：strripos（）在/var/www/vhosts/staging.xxxxxxxxx.com/httpdocs/feedback/feedback-accept.php线159个

感谢您的帮助你们的信息和建议非常好。

Here is the phpinfo() of the server the script doesn't work on

Answer 1

没有看到实际的错误是相当困难的，但我想这罪魁祸首是strripos()，这是仅适用于PHP> 5

编辑您的更新后：我猜对了。而且，顺便说一句，而在这里看着，我发现这一点：

Fatal error: Call to undefined function: strripos()

具有veeery类似于你和接受的解决方案代码，你可能指的话，那么问题（一定要贷记回答者那里如果你觉得它有用）

Answer 2

检查是否为正则表达式设置定界符#，而不是/这是默认设置。

这是对的preg_match呼叫

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

Answer 3

有一个PHP函数，其有效期为你的PHP版本。

它被称为“get_browser”，它基本上做你的功能相同的事情。

http://php.net/manual/en/function.get-browser.php