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run code in 300+ PHP versions simultaneously
<?php $foo = new stdClass(); $bar = 'bar'; $foo->$bar = array(); // works as expected var_dump($foo); //$foo->$bar[] = 'baz'; // oops
Output for 5.0.0 - 5.0.5, 5.1.1 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
object(stdClass)#1 (1) { ["bar"]=> array(0) { } }
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/hYMXB on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
object(stdClass)(1) { ["bar"]=> array(0) { } }

preferences:
238.51 ms | 402 KiB | 424 Q