Show only duplicate elements from an array

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Use this code:

# assuming your original array is $arr
array_unique(array_diff_assoc($arr, array_unique($arr)));

It will return unique duplicates but if you want non-unique duplicates then use:

array_diff_assoc($arr, array_unique($arr));

EDIT: Based on your comments, try this code:

$uarr = array_unique($arr);
var_dump(array_diff($arr, array_diff($uarr, array_diff_assoc($arr, $uarr))));

OUTPUT

array(4) {
  [5]=>
  string(5) "Ahmed"
  [6]=>
  string(5) "Ahmed"
  [7]=>
  string(4) "Ajay"
  [8]=>
  string(4) "Ajay"
}

Using array_count_values() to count up everything in the array, then filter the resulting array to show only the ones where there's more than 1:

$input = array(.... your names here ....);

$counts = array_count_values($input);

$duplicates = array_filter($counts, function element { return ($element > 1) });

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