Remove duplicate array items from the array list

RemoveDuplicates.php

<?php
/**
 * Remove duplicates found in a list of array
 */
class RemoveDuplicates
{
    /**
     * Declare properties
     *
     * @var array $data_array   The list of array
     */
    public $data_array;

    /**
     * The list of array
     */
    public function __construct($data_array = [])
    {
        $this->data_array = $data_array;
        $this->sortArray($data_array);
        $this->removeDuplicatesFromArray($data_array);
    }

    /**
     * Sort the list of array from ascending order
     *
     * @param  array $arg   Return ascending sorted array from list
     * @return array
     */
    public function sortArray($data_array)
    {
        return asort($this->data_array);
    }

    /**
     * Remove duplicate array from list
     * @param  array $data_array [description]
     * @return array             [description]
     */
    public function removeDuplicatesFromArray($data_array)
    {
        $data_array = array_map("unserialize", array_unique(array_map("serialize", $data_array)));

        foreach ($data_array as $key => $val) {
            return $this->key . ' ' . $this->val;
        }
    }
}


$newlist = new RemoveDuplicates;
$listOfArray = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5, 'c' => 3, 'a' => 1);
// print_r($listOfArray);
echo $newlist->removeDuplicatesFromArray($listOfArray);

Result

One (1)

Two (2)

Three (3)

Four (4)

Five (5)

Six (6)