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<?php $d = (object)['2778845'=> 'derp']; var_dump($d); var_dump($d->{'2778845'});
based on ZqZA2
Output for 7.2.0
object(stdClass)#1 (1) { ["2778845"]=> string(4) "derp" } string(4) "derp"
Output for 5.4.11 - 7.1.10
object(stdClass)#1 (1) { [2778845]=> string(4) "derp" } Notice: Undefined property: stdClass::$2778845 in /in/6EicU on line 7 NULL
Output for 5.3.21 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/6EicU on line 3
Process exited with code 255.