Separate flat array values into an array of unique values and an array of duplicate values

I want to find unique values. I don't want to array format, I want only string.

<?php
$array = array("kani","yuvi","raja","kani","mahi","yuvi") ;
$unique_array = array(); // unique array
$duplicate_array = array(); // duplicate array
foreach ($array as $key => $value) {
  if (!in_array($value,$unique_array)) {
       $unique_array[$key] = $value;
  } else {
     $duplicate_array[$key] = $value;
  }
}
echo "unique values are:-<br/>";
echo "<pre/>";print_r($unique_array);

echo "duplicate values are:-<br/>";
echo "<pre/>";print_r($duplicate_array);

You can use array_unique() in single line like below:-

<?php

$unique_array = array_unique($array); // get unique value from initial array

echo "<pre/>";print_r($unique_array); // print unique values array
?>

Output:- https://eval.in/601260

Reference:- http://php.net/manual/en/function.array-unique.php

If you want in string format:-

echo implode(',',$final_array);

Output:-https://eval.in/601261

The way you want is here:-

https://eval.in/601263

OR

https://eval.in/601279