3v4l.org

run code in 300+ PHP versions simultaneously
<?php $ip=$_SERVER['REMOTE_ADDR']; $ua=$_SERVER['HTTP_USER_AGENT']; $ref=$_SERVER['HTTP_REFERER']; echo $ref; ?>
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined array key "REMOTE_ADDR" in /in/i4f0d on line 2 Warning: Undefined array key "HTTP_USER_AGENT" in /in/i4f0d on line 3 Warning: Undefined array key "HTTP_REFERER" in /in/i4f0d on line 4
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined index: REMOTE_ADDR in /in/i4f0d on line 2 Notice: Undefined index: HTTP_USER_AGENT in /in/i4f0d on line 3 Notice: Undefined index: HTTP_REFERER in /in/i4f0d on line 4
Output for 7.3.32 - 7.3.33, 7.4.26
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Notice: Undefined index: REMOTE_ADDR in /in/i4f0d on line 2 Notice: Undefined index: HTTP_USER_AGENT in /in/i4f0d on line 3 Notice: Undefined index: HTTP_REFERER in /in/i4f0d on line 4

preferences:
246.97 ms | 402 KiB | 399 Q