Example of converting IP address to integer number in PHP_PHP tutorial

The IP address is converted into integer data and then saved in the database. This is a common practice. Our algorithm for converting IP is intIP = 256*256*256*w + 256*256*x + 256*y + z is enough. Let me introduce specific examples to you.

[Conversion principle]: Assuming that the IP is: w.x.y.z, the calculation formula for converting the IP address into an integer number is: intIP = 256*256*256*w + 256*256*x + 256*y + z

[PHP conversion]: PHP conversion method is relatively simple, it has two built-in functions

int ip2long ( string $ip_address ) //ip conversion Integer value
string long2ip ( string $proper_address ) // Convert integer value to ip [MySQL conversion]: Compared with MsSQL, MySQL's conversion method is relatively simple, and it is similar to PHP There are also two built-in functions

IP to integer:

select INET_ATON (IP address) integer value converted to IP

select INET_NTOA (IP integer Value)

An instance

1. Manual implementation method

 function ip2number($ip)
      {
          $t = explode('.', $ip);
          $x = 0;
          for ($i = 0; $i < 4; $i++)
          {
              $x = $x * 256 + $t[$i];
          }
          return $x;
      }
function number2ip($num)
      {
          $t = $num;
          $a = array();
          for ($i = 0; $i < 4; $i++)
          {
              $x = $t % 256;
              if($x < 0) $x += 256;
              array_unshift($a, $x);
              $t = intval($t / 256);
          }
          return implode(&#39;.&#39;, $a);
 }

http://www .bkjia.com/PHPjc/631516.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/631516.htmlTechArticleIP address is converted into integer data and then saved to the database. This is a common practice, we convert The IP algorithm is intIP = 256*256*256*w + 256*256*x + 256*y + z. Let’s give each...