ip to long

/*
Here are some tricks to convert from a "dotted" IP address to a LONG int, and backwards. This is very useful because accessing an IP addy in a database table is very much faster if it's stored as a BIGINT rather than in characters.
*/

//IP to BIGINT:
<?php
  $ipArr    = explode('.',$_SERVER['REMOTE_ADDR']);
  $ip       = $ipArr[0] * 0x1000000
            + $ipArr[1] * 0x10000
            + $ipArr[2] * 0x100
            + $ipArr[3]
            ;
?>

//This can be written in a bit more efficient way:
<?php
  $ipArr    = explode('.',$_SERVER['REMOTE_ADDR']);
  $ip       = $ipArr[0]<<24
            + $ipArr[1]<<16
            + $ipArr[2] <<8
            + $ipArr[3]
            ;
?>