PHP：根据IP地址获取所在城市

文件目录：

iplocation

—–qqwry

———-qqwry.dat

—–ipcity.class.php

ipcity.class.php文件代码：

<?php    class ipcity {        /**      * 根据ip地址获取对应所在城市      * @param type $urip 用户ip地址      * @return string      */      public function getcity( $urip, $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 ) && $dat_path = fcpath . 'plugin/iplocation/qqwry/qqwry.dat';          //判断ip地址是否有效          if ( preg_match( "/^([0-9]{1,3}.){3}[0-9]{1,3}$/", $urip ) == 0 ) {              return 'ip address invalid';          }          //打开ip数据库          if ( !$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          $urip = explode( '.', $urip );          $uripnum = $urip[0] * 16777216 + $u水产学院rip[1] * 65536 + $urip[2] * 256 + $urip[3];          //获取ip地址索引开始和结束位置          $databegin = fread( $fd, 4 );          $dataend = fread( $fd, 4 );          $uripbegin = implode( '', unpack( 'l', $databegin ) );          if ( $uripbegin < 0 )              $uripbegin += pow( 2, 32 );          $uripend = implode( '', unpack( 'l', $dataend ) );          if ( $uripend < 0 )              $uripend += pow( 2, 32 );          $uripallnum = ($uripend - $uripbegin) / 7 + 1;          $beginnum = 0;          $endnum = $uripallnum;          //使用二分查找法从索引记录中搜索匹配的ip地址记录          while ( $urip1num > $uripnum || $urip2num < $uripnum ) {              $middle = intval( ($endnum + $beginnum) / 2 );              //偏移指针到索引位置读取4个字节              fek( $fd, $uripbegin + 7 * $middle );              $uripdata1 = fread( $fd, 4 );              if ( strlen( $uripdata1 ) < 4 ) {                  fclo( $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              $urip1num = implode( '', unpack( 'l', $uripdata1 ) );              if ( $urip1num < 0 )                  $urip1num += 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 ( $urip1num > $uripnum ) {                  $endnum = $middle;                  continue;              }              //取完上一个索引后取下一个索引              $dataek = fread( $fd, 3 );              if ( strlen( $dataek ) < 3 ) {                  fclo( $fd );                  return 'file error';              }              $dataek = implode( '', unpack( 'l', $dataek . chr( 0 ) ) );              fek( $fd, $dataek );              $uripdata2 = fread( $fd, 4 );              if ( strlen( $uripdata2 ) < 4 ) {                  fclo( $fd );                  return 'file error';              }              $urip2num =国庆节英语手抄报图片 implode( '', unpack( 'l', $uripdata2 ) );              if ( $urip2num < 0 )                  $urip2num += pow( 2, 32 );              //找不到ip地址对应城市              if ( $urip2num < $uripnum ) {                  if ( $middle == $beginnum ) {                      fclo( $fd );                      return 'no data';                  }                  $beginnum = $middle;              }          }          $uripflag = fread( $fd, 1 );          if ( $uripflag == chr( 1 ) ) {              $uripek = fread( $fd, 3 );              if ( strlen( $uripek ) < 3 ) {                  fclo( $fd );                  return 'system error';              }              $uripek = implode( '', unpack( 'l', $uripek . chr( 0 ) ) );              fek( $fd, $uripek );              $uripflag = fread( $fd, 1 );          }          if ( $uripflag == chr( 2 ) ) {              $addrek = fread( $fd, 3 );              if ( strlen( $addrek ) < 3 ) {                  fclo( $fd );                  return 'system error';              }              $uripflag = fread( $fd, 1 );              if ( $uripflag == chr( 2 ) ) {                  $addrek2 = fread( $fd, 3 );                  if ( strlen( $addrek2 ) < 3 ) {                      fclo( $fd );                      return 'system error';                  }                  $addrek2 = implode( '', unpack( 'l', $addrek2 . chr( 0 ) ) );                  fek( $fd, $addrek2 );              } el {                  fek( $fd, -1, ek_cur );              }              while ( ($char = fread( $fd, 1 )) != chr( 0 ) )                  $uripaddr2 .= $char;              $addrek = implode( '', unpack( 'l', $addrek . chr( 0 ) ) );              fek( $fd, $addrek );              while ( ($char = fread( $fd, 1 )) != chr( 0 ) )                  $uripaddr1 .= $char;          } el {              fek( $fd, -1, ek_cur );              while ( ($char = fread( $fd, 1 )) != chr( 0 ) )                  $uripaddr1 .= $char;              $uripflag = fread( $fd, 1 );              if ( $uripflag == chr( 2 ) ) {                  $addrek2 = fread( $fd, 3 );                  if ( strlen( $addrek2 ) < 3 ) {                      fclo( $fd );                      return 'system error';                  }                  $addrek2 = implode( '', unpack( 'l', $addrek2 . chr( 0 ) ) );                  fek( $fd, $addrek2 );              } el {                  fek( $fd, -1, ek_cur );              }              while ( ($char = fread( $fd, 1 )) != chr( 0 ) ) {                 给自己鼓励的句子 $uripaddr2 .= $char;              }          }          fclo( $fd );          //返回ip地址对应的城市结果          if ( preg_match( '/http/i', $uripaddr2 ) ) {              $uripaddr2 = '';          }          $uripaddr = "$uripaddr1 $uripaddr2";          $uripaddr = preg_replace( '/cz88.net/is', '', $uripaddr );          $uripaddr = preg_replace( '/^s*/is', '', $uripaddr );          $uripaddr = preg_replace( '/s*$/is', '', $uripaddr );          if ( preg_match( '/http/i', $uripaddr ) || $uripaddr == '' ) {              $uripaddr = 'no data';          } elif ( !$this->is_utf8( $uripaddr ) ) {              $uripaddr = iconv( 'gbk', 'utf-8', $uripaddr );          }          return $uripaddr;      }        /**      * 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 广州百万葵园) . "]{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;          } el {              return fal;          }      }    }  

qqwry.dat文件可以在百度上搜索或者需要的发你邮箱来，我通过邮箱发给你。

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