麻烦帮忙看看哪里有问题？

Question

Notice: Undefined variable: ip1num in D:\www\3673\PHP\ip1.php on line 23Notice: Undefined variable: ip2num in D:\www\3673\PHP\ip1.php on line 23Notice: Undefined variable: ipAddr2 in D:\www\3673\PHP\ip1.php on line 96Notice: Undefined variable: ipAddr1 in D:\www\3673\PHP\ip1.php on line 102麻烦帮忙看看哪里有问题？
<?php 
function convertip($ip) { 
        if(!preg_match("/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/", $ip)) { 
                return ''; 
        }         if($fd = @fopen('QQWry.Dat', 'rb')) {//fopen()中是纯真ip数据库文件位置，请自行设定！                 $ip = explode('.', $ip); 
                $ipNum = $ip[0] * 16777216 + $ip[1] * 65536 + $ip[2] * 256 + $ip[3];                 $DataBegin = fread($fd, 4); 
                $DataEnd = fread($fd, 4); 
                $ipbegin = implode('', unpack('L', $DataBegin)); 
                if($ipbegin < 0) $ipbegin += pow(2, 32); 
                $ipend = implode('', unpack('L', $DataEnd)); 
                if($ipend < 0) $ipend += pow(2, 32); 
                $ipAllNum = ($ipend - $ipbegin) / 7 + 1;                 $BeginNum = 0; 
                $EndNum = $ipAllNum;                 while($ip1num > $ipNum || $ip2num < $ipNum) { 
                        $Middle= intval(($EndNum + $BeginNum) / 2);                         fseek($fd, $ipbegin + 7 * $Middle); 
                        $ipData1 = fread($fd, 4); 
                        if(strlen($ipData1) < 4) { 
                                fclose($fd); 
                                return '系统错误'; 
                        } 
                        $ip1num = implode('', unpack('L', $ipData1)); 
                        if($ip1num < 0) $ip1num += pow(2, 32);                         if($ip1num > $ipNum) { 
                                $EndNum = $Middle; 
                                continue; 
                        }                         $DataSeek = fread($fd, 3); 
                        if(strlen($DataSeek) < 3) { 
                                fclose($fd); 
                                return '系统错误'; 
                        } 
                        $DataSeek = implode('', unpack('L', $DataSeek.chr(0))); 
                        fseek($fd, $DataSeek); 
                        $ipData2 = fread($fd, 4); 
                        if(strlen($ipData2) < 4) { 
                                fclose($fd); 
                                return 'System Error'; 
                        } 
                        $ip2num = implode('', unpack('L', $ipData2)); 
                        if($ip2num < 0) $ip2num += pow(2, 32);                         if($ip2num < $ipNum) { 
                                if($Middle == $BeginNum) { 
                                        fclose($fd); 
                                        return 'Unknown'; 
                                } 
                                $BeginNum = $Middle; 
                        } 
                }                 $ipFlag = fread($fd, 1); 
                if($ipFlag == chr(1)) { 
                        $ipSeek = fread($fd, 3); 
                        if(strlen($ipSeek) < 3) { 
                                fclose($fd); 
                                return '系统错误'; 
                        } 
                        $ipSeek = implode('', unpack('L', $ipSeek.chr(0))); 
                        fseek($fd, $ipSeek); 
                        $ipFlag = fread($fd, 1); 
                }                 if($ipFlag == chr(2)) { 
                        $AddrSeek = fread($fd, 3); 
                        if(strlen($AddrSeek) < 3) { 
                                fclose($fd); 
                                return 'System Error'; 
                        } 
                        $ipFlag = fread($fd, 1); 
                        if($ipFlag == chr(2)) { 
                                $AddrSeek2 = fread($fd, 3); 
                                if(strlen($AddrSeek2) < 3) { 
                                        fclose($fd); 
                                        return 'System Error'; 
                                } 
                                $AddrSeek2 = implode('', unpack('L', $AddrSeek2.chr(0))); 
                                fseek($fd, $AddrSeek2); 
                        } else { 
                                fseek($fd, -1, SEEK_CUR); 
                        }                         while(($char = fread($fd, 1)) != chr(0)) 
                        $ipAddr2 .= $char;                         $AddrSeek = implode('', unpack('L', $AddrSeek.chr(0))); 
                        fseek($fd, $AddrSeek);                         while(($char = fread($fd, 1)) != chr(0)) 
                        $ipAddr1 .= $char; 
                } else { 
                        fseek($fd, -1, SEEK_CUR); 
                        while(($char = fread($fd, 1)) != chr(0)) 
                        $ipAddr1 .= $char;                         $ipFlag = fread($fd, 1); 
                        if($ipFlag == chr(2)) { 
                                $AddrSeek2 = fread($fd, 3); 
                                if(strlen($AddrSeek2) < 3) { 
                                        fclose($fd); 
                                        return 'System Error'; 
                                } 
                                $AddrSeek2 = implode('', unpack('L', $AddrSeek2.chr(0))); 
                                fseek($fd, $AddrSeek2); 
                        } else { 
                                fseek($fd, -1, SEEK_CUR); 
                        } 
                        while(($char = fread($fd, 1)) != chr(0)) 
                        $ipAddr2 .= $char; 
                } 
                fclose($fd);                 if(preg_match('/http/i', $ipAddr2)) { 
                        $ipAddr2 = ''; 
                } 
                $ipaddr = "$ipAddr1 $ipAddr2"; 
                $ipaddr = preg_replace('/CZ88\.NET/is', '', $ipaddr); 
                $ipaddr = preg_replace('/^\s*/is', '', $ipaddr); 
                $ipaddr = preg_replace('/\s*$/is', '', $ipaddr); 
                if(preg_match('/http/i', $ipaddr) || $ipaddr == '') { 
                        $ipaddr = 'Unknown'; 
                }                 return $ipaddr;         } else {                 $datadir = DISCUZ_ROOT.'./ipdata/'; 
                $ip_detail = explode('.', $ip); 
                if(file_exists($datadir.$ip_detail[0].'.txt')) { 
                        $ip_fdata = @fopen($datadir.$ip_detail[0].'.txt', 'r'); 
                } else { 
                        if(!($ip_fdata = @fopen($datadir.'0.txt', 'r'))) { 
                                return 'Invalid IP data file'; 
                        } 
                } 
                for ($i = 0; $i <= 3; $i++) { 
                        $ip_detail[$i] = sprintf('%03d', $ip_detail[$i]); 
                } 
                $ip = join('.', $ip_detail); 
                do { 
                        $ip_data = fgets($ip_fdata, 200); 
                        $ip_data_detail = explode('|', $ip_data); 
                        if($ip >= $ip_data_detail[0] && $ip <= $ip_data_detail[1]) { 
                                fclose($ip_fdata); 
                                return $ip_data_detail[2].$ip_data_detail[3]; 
                        } 
                } while(!feof($ip_fdata)); 
                fclose($ip_fdata); 
                return '未知地址';         } } ?>

Answer 1

第一行加error_reporting(0);
参考php.net/error_reporting

Answer 2

在函數內定義一下吧。。函數外定義要用globa

Answer 3

用if(isset($var)) 判断一下变量是否存在

Answer 4

在函数开始就初始化下
$ip1num = 0;
$ip2num = 0;
$ipAddr2 = "";
$ipAddr1 = "";
像上面这样，还能出错吗？

Answer 5

Notice: Undefined variable: ip1num in D:\www\3673\PHP\ip1.php on line 28Notice: Undefined variable: ip2num in D:\www\3673\PHP\ip1.php on line 28Notice: Undefined variable: ipAddr2 in D:\www\3673\PHP\ip1.php on line 101Notice: Undefined variable: ipAddr1 in D:\www\3673\PHP\ip1.php on line 107

Answer 6

这种错误在很多情况下是被忽略的，
不过，不知道PHP6里是否会强先定义。但我个人认为，能养成先定义再使用的习惯是比较不错的选择。
其它的大部分语言里基本上都要先定义。