3v4l.org

run code in 300+ PHP versions simultaneously
<?php (function() { $var = 123; $$var = "123"; print_r(get_defined_vars()); })();
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Array ( [var] => 123 [123] => 123 )
Output for 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '(' in /in/RWpUJ on line 7
Process exited with code 255.
preferences:
88.24 ms | 407 KiB | 5 Q