http://stackoverflow.com/questions/3450022/check-and-return-duplicates-array-php https://www.w3schools.com/php/func_array_diff_assoc.asp
I Used:
$set2[] = '965190';
$set2[] = '965365';
$set2[] = '96605';
$set2[] = '966146';
$set2[] = '966146';
$set = array_unique(array_diff_assoc($set2,array_unique($set2)));
foreach($set as $key => $row) {
echo $row."<br>";
}
//--------------------------------------------------------------------
function array_dup($ar){
return array_unique(array_diff_assoc($ar,array_unique($ar)));
}