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run code in 150+ php & hhvm versions
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<?php $array = ['Kale', 'Kaleidoscope', 'Aardvark', 'Apple', 'Leicester', 'Lovely']; usort($array, function($a, $b) { return strcmp($a[0], $b[0]); }); var_dump($array);
Output for hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(6) { [0]=> string(8) "Aardvark" [1]=> string(5) "Apple" [2]=> string(4) "Kale" [3]=> string(12) "Kaleidoscope" [4]=> string(9) "Leicester" [5]=> string(6) "Lovely" }
Output for 5.4.0 - 5.6.28
array(6) { [0]=> string(5) "Apple" [1]=> string(8) "Aardvark" [2]=> string(4) "Kale" [3]=> string(12) "Kaleidoscope" [4]=> string(6) "Lovely" [5]=> string(9) "Leicester" }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/nMX98 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/nMX98 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/nMX98 on line 3
Process exited with code 255.