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<?php class A { public $b = [][]; }; $a = new A;
Output for 5.6.8 - 5.6.16
Parse error: syntax error, unexpected ']' in /in/cg1F3 on line 4
Process exited with code 255.
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.5
Fatal error: Cannot use [] for reading in /in/cg1F3 on line 4
Process exited with code 255.
Output for 5.5.24 - 5.5.30
Parse error: syntax error, unexpected '[', expecting ',' or ';' in /in/cg1F3 on line 4
Process exited with code 255.

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