PHP根據(jù)IP地址獲取所在城市具體實現(xiàn)
了PHP根據(jù)IP地址獲取所在城市具體實現(xiàn)，有需要的朋友可以參考一下，就讓小編來告訴大家吧！
文件目錄：
ipLocation
-----qqwry
----------QQWry.Dat
-----ipCity.class.php
ipCity.class.php文件代碼：
復(fù)制代碼 代碼如下:
<?php
class ipCity {
/**
* 根據(jù)ip地址獲取對應(yīng)所在城市
* @param type $userip 用戶IP地址
* @return string
*/
public function getCity( $userip, $dat_path = '' ) {
//IP數(shù)據(jù)庫路徑，這里用的是QQ IP數(shù)據(jù)庫 20110405 純真版
empty( $dat_path ) && $dat_path = FCPATH . 'plugin/ipLocation/qqwry/QQWry.Dat';
//判斷IP地址是否有效
if ( preg_match( "/^([0-9]{1,3}.){3}[0-9]{1,3}$/", $userip ) == 0 ) {
return 'IP Address Invalid';
}
//打開IP數(shù)據(jù)庫
if ( !$fd = @fopen( $dat_path, 'rb' ) ) {
return 'IP data file not exists or access denied';
}
//explode函數(shù)分解IP地址，運算得出整數(shù)形結(jié)果
$userip = explode( '.', $userip );
$useripNum = $userip[0] * 16777216 + $userip[1] * 65536 + $userip[2] * 256 + $userip[3];
//獲取IP地址索引開始和結(jié)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;
//使用二分查找法從索引記錄中搜索匹配的IP地址記錄
while ( $userip1num > $useripNum || $userip2num < $useripNum ) {
$Middle = intval( ($EndNum + $BeginNum) / 2 );
//偏移指針到索引位置讀取4個字節(jié)
fseek( $fd, $useripbegin + 7 * $Middle );
$useripData1 = fread( $fd, 4 );
if ( strlen( $useripData1 ) < 4 ) {
fclose( $fd );
return 'File Error';
}
//提取出來的數(shù)據(jù)轉(zhuǎn)換成長整形，如果數(shù)據(jù)是負(fù)數(shù)則加上2的32次冪
$userip1num = implode( '', unpack( 'L', $useripData1 ) );
if ( $userip1num < 0 )
$userip1num += pow( 2, 32 );
//提取的長整型數(shù)大于我們IP地址則修改結(jié)束位置進(jìn)行下一次循環(huán)
if ( $userip1num > $useripNum ) {
$EndNum = $Middle;
continue;
}
//取完上一個索引后取下一個索引
$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地址對應(yīng)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地址對應(yīng)的城市結(jié)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;
}
/**
* 判斷是否我utf-8編碼的字符串
* @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;
}
}
}
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