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run code in 150+ php & hhvm versions
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<?php $array= array('mela','mela','pera','arancia','mela','mela','arancia'); print_r(array_diff_key($array, array_unique($array)));
based on MbhCm
Output for 5.1.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [1] => mela [4] => mela [5] => mela [6] => arancia )
Output for 5.0.0 - 5.0.5
Fatal error: Call to undefined function array_diff_key() in /in/UXiEJ on line 4
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_diff_key() in /in/UXiEJ on line 4
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_diff_key() in /in/UXiEJ on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_diff_key() in /in/UXiEJ on line 4