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<!DOCTYPE html> <html> <body> <?php // Variable to check $ip = "127.0.0.1"; // Validate ip if (filter_var($ip, FILTER_VALIDATE_IP)) { 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
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