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PHP Filters

Validate an IP Address

127.0.0.1 is a valid IP address

<?php
$ip = "127.0.0.1";

// validate IP address
if (!filter_var($ip, FILTER_VALIDATE_IP) === false) {
  echo("$ip is a valid IP address");
} else {
  echo("$ip is not a valid IP address");
}
?>