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<?php $a= array('mela'=>'pera','mela'=> 'pera','arancia'=>'mela'); $b= array_diff_key( $a , array_unique( $a ) ); $i=0; print_r($b); print_r($b[1]);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( ) Warning: Undefined array key 1 in /in/1JCeo on line 7

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