3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo reset(explode('.',$_SERVER['HTTP_HOST']));
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: Undefined array key "HTTP_HOST" in /in/lbi3M on line 2 Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /in/lbi3M on line 2 Notice: Only variables should be passed by reference in /in/lbi3M on line 2
Output for 8.0.0 - 8.0.30
Warning: Undefined array key "HTTP_HOST" in /in/lbi3M on line 2 Notice: Only variables should be passed by reference in /in/lbi3M on line 2
Output for 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 - 7.4.25, 7.4.27 - 7.4.33
Notice: Undefined index: HTTP_HOST in /in/lbi3M on line 2 Notice: Only variables should be passed by reference in /in/lbi3M on line 2
Output for 7.3.32 - 7.3.33, 7.4.26
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28
Notice: Undefined index: HTTP_HOST in /in/lbi3M on line 2 Strict Standards: Only variables should be passed by reference in /in/lbi3M on line 2
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Notice: Undefined index: HTTP_HOST in /in/lbi3M on line 2 Strict Standards: Only variables should be passed by reference in /in/lbi3M on line 2
Output for 5.0.5
Notice: Undefined index: HTTP_HOST in /in/lbi3M on line 2 Fatal error: Only variables can be passed by reference in /in/lbi3M on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.4
Notice: Undefined index: HTTP_HOST in /in/lbi3M on line 2

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