3v4l.org

run code in 300+ PHP versions simultaneously
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>IP Grabber</title> </head> <body> <h1>Visitor's IP Address:</h1> <?php if (!empty($_SERVER['HTTP_CLIENT_IP'])) { $ip_address = $_SERVER['HTTP_CLIENT_IP']; } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) { $ip_address = $_SERVER['HTTP_X_FORWARDED_FOR']; } else { $ip_address = $_SERVER['REMOTE_ADDR']; } echo "<p>$ip_address</p>"; ?> </body> </html>
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>IP Grabber</title> </head> <body> <h1>Visitor's IP Address:</h1> Warning: Undefined array key "REMOTE_ADDR" in /in/m6RlG on line 16 <p></p></body> </html>
preferences:
45.76 ms | 403 KiB | 62 Q