- print_r: documentation ( source)
- array_diff_key: documentation ( source)
- array_unique: documentation ( source)
<?php
$a= array(
'mela' => 'pera',
'pippo'=> 'pera',
'carlo'=>'banana',
'saverio'=>'pera',
'antonio'=>'banana',
);
$b= array_diff_key( $a , array_unique( $a ) );
$i=0;
print_r($b);
foreach($b as $c => $key){
print_r($c);
print_r($key);
}