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<?php $a= array('mela','mela' ,'pera','arancia','mela','mela','arancia'); print_r(array_diff_key( $a , array_unique( $a ) ));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [1] => mela [4] => mela [5] => mela [6] => arancia )

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