ip 转int 记录

标签：exp   pre   for   echo   array   imp   print   ipa   3.1   

$ipArr    = explode(‘.‘,‘139.86.23.139‘);
print_r($ipArr);
$ip       = $ipArr[0] * 0x1000000
    + $ipArr[1] * 0x10000
    + $ipArr[2] * 0x100
    + $ipArr[3];
echo $ip.‘<br>‘;

$ipVal =$ip;
$ipArr = array(0 =>
    floor(  $ipVal               / 0x1000000) );
$ipVint   = $ipVal-($ipArr[0]*0x1000000); // for clarity
$ipArr[1] = ($ipVint & 0xFF0000)  >> 16;
$ipArr[2] = ($ipVint & 0xFF00  )  >> 8;
$ipArr[3] =  $ipVint & 0xFF;
$ipDotted = implode(‘.‘, $ipArr);
echo $ipDotted;


---------------------------------------------------
int()  精度丢失

$a = (0.1 + 0.7) *10;

echo  (int) $a; // 7  int
echo  var_dump($a)   //8  float

ip 转int 记录

标签：exp   pre   for   echo   array   imp   print   ipa   3.1   

原文地址：https://www.cnblogs.com/opzx/p/9974727.html