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run code in 300+ PHP versions simultaneously
<?php var_dump((object) [''=>'foo']);
Output for 5.6.21 - 5.6.26, 7.0.6 - 7.0.20, 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 - 8.2.19, 8.3.0 - 8.3.7
object(stdClass)#1 (1) { [""]=> string(3) "foo" }
Output for 5.6.0 - 5.6.20, 7.0.0 - 7.0.5
object(stdClass)#1 (1) { Notice: Illegal member variable name in /in/r30Ho on line 3 [""]=> string(3) "foo" }

preferences:
160.08 ms | 402 KiB | 206 Q