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<?php $a = (object)['a', 'b']; var_dump($a);
Output for 7.2.0
object(stdClass)#1 (2) { ["0"]=> string(1) "a" ["1"]=> string(1) "b" }
Output for 5.4.0 - 7.1.10
object(stdClass)#1 (2) { [0]=> string(1) "a" [1]=> string(1) "b" }
Output for 5.3.7 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/23W2u on line 2
Process exited with code 255.