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run code in 300+ PHP versions simultaneously
<?php $foo = new \StdClass; $foo->{6} = 'bar'; unset($foo->{6}); var_dump($foo);
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
object(stdClass)#1 (0) { }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/fBCU3 on line 3 object(stdClass)#1 (0) { }
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.9
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/fBCU3 on line 3 Fatal error: Property name must be a string in /in/fBCU3 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.2
Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /in/fBCU3 on line 3
Process exited with code 139.

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