PHP IP string and Integer interchange

PHP has built-in functions ip2long can convert IP addresses to integer types.

Convert an integer to an IP address using LONG2IP

Example:

$ip = ' 58.6.207.207 '; $ip _int Ip2long ($ip); Echo $ip. " <br/> "; Echo $ip _int. " <br/> "; Echo Long2ip ($ip _int);

Conversion principle:
First, the first paragraph multiplied by 256 of the three square, the second segment multiplied by 256 squared, the third paragraph multiplied by 256, the last sum

$array [0]*256*256*256+ $array [1]*256*256+ $array [2]*256+ $array [3];

PHP IP string and Integer interchange