As we all know that long2ip works as ip1.ip2.ip3.ip4 (123.131.231.212)long ip => (ip1 * 256 * 256 * 256) + (ip2 * 256 * 256) + (ip3 * 256) + ip42072242132 => (123 * 256 * 256 * 256) + (131 * 256 * 256) + (231 * 256) + 212But what would be pseudo code for converting this number back into an IP address?Also what would be the most suitable way to store IP addresses in MySQL for a traffic analytics website which will have about over 500 IP lookups per second?Would it be better if a table with unique IDs is created for every single IP and then that is used for lookups?Thanks

$long = ip2long("123.131.231.212");$ip = array();array_unshift($ip, $long & 0xFF);array_unshift($ip, ($long >>= 8) & 0xFF);array_unshift($ip, ($long >>= 8) & 0xFF);array_unshift($ip, ($long >>= 8) & 0xFF);// $ip =// Array// (//     [0] => 123//     [1] => 131//     [2] => 231//     [3] => 212// )

现在PHP中有很多时候都会用到ip地址，但是这个ip地址获取的时候都不是10进制的。那么PHP中如何将ip地址转成十进制数，下面为大家介绍下两种方法可以轻松实现

PHP中如何将ip地址转成十进制数呢？现在PHP中有很多时候都会用到ip地址，但是这个ip地址获取的时候都不是10进制的。那么PHP中如何将ip地址转成十进制数就是我们比较头疼的事情了，下面两种方法是我整理处理来相对比较简单的IP地址转成十进制数的方法。希望能对大家有所帮助。

方法一、

public function ipToLong(){ $ip = $_SERVER['REMOTE_ADDR']; $ip = explode('.', $ip); $ip = array_reverse($ip);//数组反转 $r = 0; for($i=0,$j=count($ip); $i<$j; $i++){ $r += $ip[$i] * pow(256, $i); } $r = sprintf("%u", $r); echo $r; }

方法二、

public function ipToLong(){ $ip = $_SERVER['REMOTE_ADDR']; $ip = explode('.',$ip); $r = ($ip[0] << 24) | ($ip[1] << 16) | ($ip[2] << 8) | $ip[3]; if($r < 0) $r += 4294967296; echo $r ; }

两个结果在本地服务器中的结果都是3232235877，运用的ip是192.168.1.101。我们用ping 192.168.1.101 和 ping 3232235877来进行检测，看是否一样。