Get your own PHP server Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<body>
​
<?php
$ip = "127.0.0.1";
​
if (!filter_var($ip, FILTER_VALIDATE_IP) === false) {
  echo("$ip is a valid IP address");
} else {
  echo("$ip is not a valid IP address");
}
?>
​
</body>
</html>
​
127.0.0.1 is a valid IP address