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<?php $d = (object)[2778845 => 'derp']; var_dump($d->{2778845});
based on fVgET
Output for 7.2.0
string(4) "derp"
Output for 5.4.11 - 7.1.10
Notice: Undefined property: stdClass::$2778845 in /in/7HXMJ on line 5 NULL
Output for 5.3.21 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/7HXMJ on line 3
Process exited with code 255.