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run code in 300+ PHP versions simultaneously
<?php namespace a; $a = []; if(\isset($a)) { echo 'asd'; }
Output for 8.1.23 - 8.1.28, 8.2.10 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Fatal error: Uncaught Error: Call to undefined function isset() in /in/T0v93:7 Stack trace: #0 {main} thrown in /in/T0v93 on line 7
Process exited with code 255.
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Fatal error: Uncaught Error: Call to undefined function isset() in /in/T0v93:7 Stack trace: #0 {main} thrown in /in/T0v93 on line 7
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.6
Parse error: syntax error, unexpected 'isset' (T_ISSET), expecting identifier (T_STRING) in /in/T0v93 on line 7
Process exited with code 255.

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