PHP根据IP地址获取所在城市具体实现
这篇文章主要介绍了PHP根据IP地址获取所在城市具体实现，有需要的朋友可以参考一下
文件目录：
ipLocation
-----qqwry
----------QQWry.Dat
-----ipCity.class.php
ipCity.class.php文件代码：
<?phpclass ipCity {
/** * 根据ip地址获取对应所在城市 * @param type $userip 用户IP地址 * @return string */ public function getCity( $userip, $dat_path = '' ) { //IP数据库路径，这里用的是QQ IP数据库 20110405 纯真版 empty( $dat_path ) && $dat_path = FCPATH . 'plugin/ipLocation/qqwry/QQWry.Dat'; //判断IP地址是否有效 if ( preg_match( "/^([0-9]{1,3}.){3}[0-9]{1,3}$/", $userip ) == 0 ) { return 'IP Address Invalid'; } //打开IP数据库 if ( !$fd = @fopen( $dat_path, 'rb' ) ) { return 'IP data file not exists or access denied'; } //explode函数分解IP地址，运算得出整数形结果 $userip = explode( '.', $userip ); $useripNum = $userip[0] * 16777216 + $userip[1] * 65536 + $userip[2] * 256 + $userip[3]; //获取IP地址索引开始和结束位置 $DataBegin = fread( $fd, 4 ); $DataEnd = fread( $fd, 4 ); $useripbegin = implode( '', unpack( 'L', $DataBegin ) ); if ( $useripbegin < 0 ) $useripbegin += pow( 2, 32 ); $useripend = implode( '', unpack( 'L', $DataEnd ) ); if ( $useripend < 0 ) $useripend += pow( 2, 32 ); $useripAllNum = ($useripend - $useripbegin) / 7 + 1; $BeginNum = 0; $EndNum = $useripAllNum; //使用二分查找法从索引记录中搜索匹配的IP地址记录 while ( $userip1num > $useripNum || $userip2num < $useripNum ) { $Middle = intval( ($EndNum + $BeginNum) / 2 ); //偏移指针到索引位置读取4个字节 fseek( $fd, $useripbegin + 7 * $Middle ); $useripData1 = fread( $fd, 4 ); if ( strlen( $useripData1 ) < 4 ) { fclose( $fd ); return 'File Error'; } //提取出来的数据转换成长整形，如果数据是负数则加上2的32次幂 $userip1num = implode( '', unpack( 'L', $useripData1 ) ); if ( $userip1num < 0 ) $userip1num += pow( 2, 32 ); //提取的长整型数大于我们IP地址则修改结束位置进行下一次循环 if ( $userip1num > $useripNum ) { $EndNum = $Middle; continue; } //取完上一个索引后取下一个索引 $DataSeek = fread( $fd, 3 ); if ( strlen( $DataSeek ) < 3 ) { fclose( $fd ); return 'File Error'; } $DataSeek = implode( '', unpack( 'L', $DataSeek . chr( 0 ) ) ); fseek( $fd, $DataSeek ); $useripData2 = fread( $fd, 4 ); if ( strlen( $useripData2 ) < 4 ) { fclose( $fd ); return 'File Error'; } $userip2num = implode( '', unpack( 'L', $useripData2 ) ); if ( $userip2num < 0 ) $userip2num += pow( 2, 32 ); //找不到IP地址对应城市 if ( $userip2num < $useripNum ) { if ( $Middle == $BeginNum ) { fclose( $fd ); return 'No Data'; } $BeginNum = $Middle; } } $useripFlag = fread( $fd, 1 ); if ( $useripFlag == chr( 1 ) ) { $useripSeek = fread( $fd, 3 ); if ( strlen( $useripSeek ) < 3 ) { fclose( $fd ); return 'System Error'; } $useripSeek = implode( '', unpack( 'L', $useripSeek . chr( 0 ) ) ); fseek( $fd, $useripSeek ); $useripFlag = fread( $fd, 1 ); } if ( $useripFlag == chr( 2 ) ) { $AddrSeek = fread( $fd, 3 ); if ( strlen( $AddrSeek ) < 3 ) { fclose( $fd ); return 'System Error'; } $useripFlag = fread( $fd, 1 ); if ( $useripFlag == 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 ) ) $useripAddr2 .= $char; $AddrSeek = implode( '', unpack( 'L', $AddrSeek . chr( 0 ) ) ); fseek( $fd, $AddrSeek ); while ( ($char = fread( $fd, 1 )) != chr( 0 ) ) $useripAddr1 .= $char; } else { fseek( $fd, -1, SEEK_CUR ); while ( ($char = fread( $fd, 1 )) != chr( 0 ) ) $useripAddr1 .= $char; $useripFlag = fread( $fd, 1 ); if ( $useripFlag == 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 ) ) { $useripAddr2 .= $char; } } fclose( $fd ); //返回IP地址对应的城市结果 if ( preg_match( '/http/i', $useripAddr2 ) ) { $useripAddr2 = ''; } $useripaddr = "$useripAddr1 $useripAddr2"; $useripaddr = preg_replace( '/CZ88.Net/is', '', $useripaddr ); $useripaddr = preg_replace( '/^s*/is', '', $useripaddr ); $useripaddr = preg_replace( '/s*$/is', '', $useripaddr ); if ( preg_match( '/http/i', $useripaddr ) || $useripaddr == '' ) { $useripaddr = 'No Data'; } elseif ( !$this->is_utf8( $useripaddr ) ) { $useripaddr = iconv( 'GBK', 'UTF-8', $useripaddr ); } return $useripaddr; }
/** * 判断是否我utf-8编码的字符串 * @param type $string * @return boolean */ private function is_utf8( $string ) { if ( preg_match( "/^([" . chr( 228 ) . "-" . chr( 233 ) . "]{1}[" . chr( 128 ) . "-" . chr( 191 ) . "]{1}[" . chr( 128 ) . "-" . chr( 191 ) . "]{1}){1}/", $string ) == true || preg_match( "/([" . chr( 228 ) . "-" . chr( 233 ) . "]{1}[" . chr( 128 ) . "-" . chr( 191 ) . "]{1}[" . chr( 128 ) . "-" . chr( 191 ) . "]{1}){1}$/", $string ) == true || preg_match( "/([" . chr( 228 ) . "-" . chr( 233 ) . "]{1}[" . chr( 128 ) . "-" . chr( 191 ) . "]{1}[" . chr( 128 ) . "-" . chr( 191 ) . "]{1}){2,}/", $string ) == true ) { return true; } else { return false; } }
}
QQWry.Dat文件下载地址：http://xiazai.jb51.net/201311/yuanma/qqwry.dat(jb51.net).zip
使用演示：
include FCPATH . 'plugin/ipLocation/ipCity.class.php'; $city = new ipCity(); $addr = $city->getCity( '172.0.0.1' ); echo $addr; // echo 本地地址