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2<?php const A = [1 => '123123', 2 => ['qwe', 'weqqwewq'], 3]; var_dump(A[2]);
based on c8RRi
Output for 5.6.7 - 5.6.28, 7.0.0 - 7.1.0
2array(2) { [0]=> string(3) "qwe" [1]=> string(8) "weqqwewq" }
Output for hhvm-3.12.0
Fatal error: syntax error, unexpected '[', expecting ')' in /in/mJBAH on line 4
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.5.35
Fatal error: Arrays are not allowed as constants in /in/mJBAH on line 3
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/mJBAH on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_CONST in /in/mJBAH on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_CONST in /in/mJBAH on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/mJBAH on line 3
Process exited with code 255.