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<?php $🐵 = ['a', ['b', 'c']]; $😸 = array('a', array('b', 'c')); var_dump($🐵); var_dump($😸);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.15, 5.5.18 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { [0]=> string(1) "a" [1]=> array(2) { [0]=> string(1) "b" [1]=> string(1) "c" } } array(2) { [0]=> string(1) "a" [1]=> array(2) { [0]=> string(1) "b" [1]=> string(1) "c" } }
Output for 5.5.16

Process exited with code 137.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/LhHkZ on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/LhHkZ on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/LhHkZ on line 2
Process exited with code 255.

preferences:
231.37 ms | 401 KiB | 356 Q