未定义变量和偏移量 - Undefined variable and offset

我的错误是:

注意:未定义变量:返回在C:'xampp'htdocs'server4.php第21行

，第21行是

   $return .= fgets($this->_socket);

注意:C:'xampp'htdocs'server4.php第95行中未定义的offset: 0

，第95行是

$serverInfo = $master->server_getInfo($serverList[0]['ip'], $serverList[0]['port']);

和我的完整代码:

<?php
class Q3Master
{
    private $_socket;
    private $_port = '20810';
    private $_host;
    public function __construct($masterHost)
    {
            $this->_socket = fsockopen('udp://79.175.173.73',20810);
            stream_set_blocking($this->_socket,0);
    }
    public function master_listServers($timeout = '1')
    {
            fputs($this->_socket,str_repeat(chr(255),4).'getservers 69 empty full demo'."'n");
            $time=time()+$timeout;
            while($time > time() || strpos($return,'EOT') === FALSE)
            {
                    $return .= fgets($this->_socket);
            }
            $return = explode('''',$return);
            unset($return[0]);
            unset($return[count($return)]);
            $iplist = array();
            foreach($return as $server)
            {
                    for($i = 0;$i < 4;$i++)
                            $addr[] = ord($server[$i]);
                    for($i = 4;$i < 6;$i++)
                            $port .= dechex(ord($server[$i]));
                    $port = hexdec($port);
                    $iplist[] = array('ip' => join('.',$addr),'port' => $port);
                    unset($addr);
                    unset($port);
            }
            return $iplist;
    }
    function server_getInfo($adresse, $port)
    {
            if($port != 0)
            {
                    $cmd = "'xFF'xFF'xFF'xFFgetstatus";
                    $f = fsockopen('udp://'.$adresse, $port);
                    socket_set_timeout ($f, 1);
                    fwrite ($f, $cmd);
                    $data = fread ($f, 10000);
                    fclose ($f);
     if($data)
     {
        $temp = explode("'x0a",$data);
        $list3 = explode("''",substr($temp[1],1,strlen($temp[1])));
        for ($i = 0;$i <= count($list3);$i = $i + 2) {
           $list[@$list3[$i]] = @$list3[$i + 1];
        }
        array_pop($list);
        $players = array();
        foreach($temp as $id => $player)
        {
           if($id != 0 AND $id != 1)
           {
              $infos = explode(' ', $player, 3);
              $name = explode('"', $infos[2]);
              $players[] = array('score' => $infos[0], 'ping' => $infos[1], 'name' => $name[1]);
           }
        }
        array_pop($players);
        $infos = array();
        $infos = $list;
        $infos['players'] = $players;
        return $infos;
     }
     else
        return FALSE;
            }
            else
                    return FALSE;
    }
}
$master = new Q3Master('79.175.173.73');
$serverList = $master->master_listServers();

$serverInfo = $master->server_getInfo($serverList[0]['ip'], $serverList[0]['port']);
?>

添加var return的初始化:

$return = '';

试试这个:

public function master_listServers($timeout = '1')
    {
            $return = '';
            fputs($this->_socket,str_repeat(chr(255),4).'getservers 69 empty full demo'."'n");
            $time=time()+$timeout;
            while($time > time() || strpos($return,'EOT') === FALSE)
            {
                    $return .= fgets($this->_socket);
            }
            $return = explode('''',$return);
            unset($return[0]);
            unset($return[count($return)]);
            $iplist = array();
            foreach($return as $server)
            {
                    for($i = 0;$i < 4;$i++)
                            $addr[] = ord($server[$i]);
                    for($i = 4;$i < 6;$i++)
                            $port .= dechex(ord($server[$i]));
                    $port = hexdec($port);
                    $iplist[] = array('ip' => join('.',$addr),'port' => $port);
                    unset($addr);
                    unset($port);
            }
            return $iplist;
    }

注意:未定义变量:返回在C:'xampp'htdocs'server4.php第21行

然后定义变量:$return = null。

注意:C:'xampp'htdocs'server4.php第95行中未定义的offset: 0

然后定义偏移量:$serverList[0] = array('ip' => null, 'port' => null)，或者在使用它之前检查偏移量是否定义:

if (isset($serverList[0])) {
  $serverInfo = $master->server_getInfo($serverList[0]['ip'],
                                        $serverList[0]['port']);
}

但是首先你应该调查为什么你期望$return和$serverList[0]被定义。也许这些变量应该由代码的不同部分提供，这是错误的。

您需要在使用$return之前定义它，因为如果while循环不会被执行，则$return未被定义，因此不能用作explode()的参数。

$return = ''; // <-- define it as an empty string
while($time > time() || strpos($return,'EOT') === FALSE)
{
       $return .= fgets($this->_socket);
}
$return = explode('''',$return);