- print_r: documentation ( source)
- array_diff_key: documentation ( source)
- array_unique: documentation ( source)
<?php
$a= array('mela','mela' ,'pera','arancia','mela','mela','arancia');
$b= array_diff_key( $a , array_unique( $a ) );
foreach ($b as $c) {
$row[]=$c;
print_r($row);
}