3v4l.org

run code in 300+ PHP versions simultaneously
<html> <body> <?php echo "<p>" . $_SERVER['HTTP_X_FORWARDED_FOR'] . "</p>"; ?> </body> </html>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
<html> <body> Warning: Undefined array key "HTTP_X_FORWARDED_FOR" in /in/28g14 on line 4 <p></p> </body> </html>
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
<html> <body> Notice: Undefined index: HTTP_X_FORWARDED_FOR in /in/28g14 on line 4 <p></p> </body> </html>
Output for 7.3.32 - 7.3.33
<html> <body> <p></p> </body> </html>
preferences:
202.45 ms | 401 KiB | 196 Q