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<?php $test = []; $i = 0; $test['bcc' . $i] = 'test1'; $test["bbc$i"] = 'test2'; var_dump($test);
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(2) { ["bcc0"]=> string(5) "test1" ["bbc0"]=> string(5) "test2" }
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/4bEhu 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 '[' in /in/4bEhu on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/4bEhu on line 3
Process exited with code 255.