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<?php $a = new stdClass(); $a->{1} = 5; var_dump($a);
Output for 5.6.0 - 5.6.24, 7.0.0 - 7.0.20, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
object(stdClass)#1 (1) { ["1"]=> int(5) }
preferences:
189.51 ms | 403 KiB | 229 Q