Ip2long and long2ip analysis

<?php

$ip='47.93.97.127';
$long=sprintf("%u",ip2long($ip));//string(9) "794648959"   9 position 
var_dump($long);

echo "<br>";
$ip='247.193.197.127';
$long=ip2long($ip);//int(-138295937) 
var_dump($long);


echo "<br>";
$ip='247.193.197.127';
$long2=sprintf("%u",ip2long($ip));
var_dump($long2);      //string(10) "4156671359"  10 position 
echo "<br>";
var_dump(long2ip($long2));//string(15) "247.193.197.127" 

Copy

$ip=’47.93.97.127′; as long as 47 Change to three digits , After converting to an integer, it is 10 position , need sprintf Function transformation , Otherwise, negative numbers appear

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