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run code in 300+ PHP versions simultaneously
<? if(isset(NULL)) { echo "true\n"; } else { echo "false\n"; } ?>
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.32, 7.2.29 - 7.2.33, 7.3.16 - 7.3.31, 7.4.3 - 7.4.25, 7.4.27 - 7.4.32, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
<? if(isset(NULL)) { echo "true\n"; } else { echo "false\n"; } ?>
Output for 7.3.32 - 7.3.33, 7.4.26, 7.4.33, 8.0.13
Fatal error: Cannot use isset() on the result of an expression (you can use "null !== expression" instead) in /in/sdbn8 on line 1
Process exited with code 255.

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