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PHP IPµØÖ·ºÍÊ®½øÖÆÊý×Ö»¥×ª

 IPV4 ¿ÉÒÔ¿´×ö4¸ö256½øÖƵÄÊý×Ö, ¿ÉÒÔ°´³£¹æµÄ½øÖÆ×ª»»»»Ëã³ÉÊ®½øÖÆ.
Èç 192.168.1.1 »»Ëã³É10½øÖÆ:
192*256*256*256 + 168*256*256+1*256+1
Æäʵ¼ÆËã»ú¸üÉó¤ÒÆÎ»ºÍÓë»òÔËËã. ¿ÉÒԸĽøËã·¨ÈçÏÂ.
IP ת³¤ÕûÐÍ
public ipToInt($sIP)
{
$aIP = explode('.',$sIP);
$iIP = ($aIP[0] << 24) | ($aIP[1] << 16) | ($aIP[2] << 8) | $aIP[3]
if($iIP < 0) $iIP += 4294967296;
return $iIP;
}

ÕûÐÍת IP:
function intToIP($iIP)
{
$xor = array(0x000000ff,0x0000ff00,0x00ff0000,0xff000000);
for($i=0; $i<4; $i++)
{
${s.$i} = ($iIP & $xor[$i]) >> $i*8;
if (${s.$i} < 0) ${s.$i} += 256;
}
return $s3.'.'.$s2.'.'.$s1.'.'.$s0;
}


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