IP地址 地理位置查詢api 轉化ip地址爲整數 xx.xx.xx.xx => Integer long2ip IP

* 查詢接口

http://api.k780.com:88/?app=ip.get&ip=47.96.133.100&appkey=10003&sign=b59bc3ef6191eb9f747dd4e83c99f2a4&format=json

{"success":"1","result":{"status":"OK","ip":"47.96.133.100","ip_str":"47.96.133.1","ip_end":"47.96.133.254","inet_ip":"794854756","inet_str":"794854657","inet_end":"794854910","areano":"0571","postno":"310000","operators":"阿里雲","att":"中國,浙江,杭州","detailed":"中國浙江杭州 阿里雲/電信/聯通/移動/鐵通/教育網","area_style_simcall":"中國,浙江,杭州","area_style_areanm":"中華人民共和國,浙江省,杭州市"}}

 

* IP地址轉化爲整數 (js實現)

function ip2int(ip) {
    var i = ip.split('.').map(function(s) {
        return s.split('').reduce(function(a, c, i) {
            return (a = 10*a + c.charCodeAt(0)-48)
        }, 0);
    }).reduce(function(a, c, i, array) {
		a |= c << (array.length-i-1)*8;
        return a;
    }, 0);
	if (i < 0) {
		i += 0x0000000100000000;
	}
	return i;
}

var ip_int = ip2int("47.96.133.100");
console.log(ip_int);

Output:

794854756

console.log( ip2int("172.16.0.224") );

2886729952

經過http://www.bejson.com/convert/ip2int/驗證

 

參考ECMA-262

12.8.3.1 Runtime Semantics: Evaluation 
ShiftExpression : ShiftExpression << AdditiveExpression 
1. Let lref be the result of evaluating ShiftExpression. 
2. Let lval be GetValue(lref). 
3. ReturnIfAbrupt(lval). 
4. Let rref be the result of evaluating AdditiveExpression. 
5. Let rval be GetValue(rref). 
6. ReturnIfAbrupt(rval). 
7. Let lnum be ToInt32(lval). 
8. ReturnIfAbrupt(lnum). 
9. Let rnum be ToUint32(rval). 
10. ReturnIfAbrupt(rnum). 
11. Let shiftCount be the result of masking out all but the least significant 5 bits of rnum, that is, compute 
rnum & 0x1F. 
12. Return the result of left shifting lnum by shiftCount bits. The result is a signed 32-bit integer.

172.16.0.1 會變爲負數

根據ECMA-262文檔，移位操做返回值 是 signed int 32位， 因此無法經過 &= 0x00000000ffffffff 把32bit最高位置爲0, - 轉換爲正數 - 只能加上4294967296

 

* IP 整數轉換爲字符串

function int2ip(bytes) {
	var a = bytes >> 24, b = bytes >> 16 & 0x00ff,
		c = bytes >> 8 & 0x000000ff, d = bytes & 0x000000ff;
	return a +'.' + b + '.' +c + '.' +d;
}

test case: 3083241027

"-73.198.134.67"

最前面一個字節出現了負值 ，由於最高位爲1，因此須要 & 0x00ff，把高位置爲0

function int2ip(bytes) {
	var a = (bytes >> 24)&0x00ff, b = bytes >> 16 & 0x00ff,
		c = bytes >> 8 & 0x000000ff, d = bytes & 0x000000ff;
	return a +'.' + b + '.' +c + '.' +d;
}

 

php 實現:

* long2ip.php

<?php
function mylong2ip($long) {
    $long &= 0xffffffff;
    $a = [ ($long >> 24)&0x00ff, ($long >> 16)&0x00ff, ($long >> 8)&0x0000ff, $long & 0xff ];
    return implode('.', $a);
}

function myip2long($ip) {
    $arr = explode('.', $ip);
    $s2i = function($s) {
        $n = strlen($s);
        $acc = 0;
        for ($i = 0; $i < $n; $i++) {
            $acc = 10 * $acc + (ord($s[$i]) - 48);
        }
        return $acc;
    };
    list($a, $b, $c, $d) = array_map($s2i, $arr);
    return ($a<<24) | ($b << 16) | ($c <<8) | $d;
}

// test:

$ip = mylong2ip(794854756); // 47.96.133.100
echo $ip.PHP_EOL;

$long = myip2long($ip);
echo $long.PHP_EOL;

// run:

ubuntu@et-dev-mingzhanghui:~/code/php$ php long2ip.php
47.96.133.100
794854756

 

ip地址換化爲整數爲負數?  + 4294967296  

2 * (2147483647+1)

 

相關的php函數:

http://php.net/manual/en/function.list.php

http://php.net/manual/en/function.array-map.php

http://php.net/manual/en/function.ord.php

http://php.net/manual/en/function.explode.php

http://php.net/manual/en/function.strlen.php