ip地址怎么转换为IPCDBL _PHP

ip地址如何转换为IPCDBL
ip地址如何转换为IPCDBL?
如192.168.1.255转换后是3232236031,
求ip转换为ipcdbl的算法和ipcdbl转换为ip的算法

------解决方案--------------------

PHP code

<?php

function iptolong($ip){
    $key = explode('.', $ip);
    if(count($key) >= 4){
        $long = intval($key[0]) * 16777216 + intval($key[1]) * 65536 + intval($key[2]) * 256 + intval($key[3]);
    }
    return $long;
}

function longtoip($long){
    $long = floor($long);
    $p4 = $long - floor($long / 256) * 256;
    $long = ($long - $p4) / 256;
    $p3 = $long - floor($long / 256) * 256;
    $long = ($long - $p3) / 256;
    $p2 = $long - floor($long / 256) * 256;
    $long = ($long - $p2) / 256;
    $p1 = $long;
    $ip = $p1.'.'.$p2.'.'.$p3.'.'.$p4;
    return $ip;
}




?>