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<?php var_export(array_unique(['1', 'a', 1, 9, null], SORT_REGULAR)); echo "\n";
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 8.0.0 - 8.0.23, 8.1.0 - 8.1.10
array ( 0 => '1', 1 => 'a', 3 => 9, 4 => NULL, )
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 - 7.4.30
array ( 0 => '1', 1 => 'a', 2 => 1, 3 => 9, 4 => NULL, )
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 '[', expecting ')' in /in/WTZe6 on line 3
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 '[', expecting ')' in /in/WTZe6 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/WTZe6 on line 3
Process exited with code 255.

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