php - Create an attributes array => values ​without duplicates

I develop a module under prestashop and I retrieve from an API a list of articles with variations. here is the form of an article.

    array:24 [в–ј
  "is_default" => false
  "options" => []
  "_id" => "5dc40f2f8ec93f00089d2408"
  "name" => "LONGONI noir Г  scratch - Gant"
  "full_price" => 21
  "reference" => "1301100017"
  "in_stock" => true,
  "variations" => array:1 [в–ј
    0 => array:3 [в–ј
      "priority" => 0
      "key" => "main"
      "values" => array:2 [в–ј
        0 => array:2 [в–ј
          "priority" => 0
          "value" => "droite"
        ]
        1 => array:2 [в–ј
          "priority" => 1
          "value" => "gauche"
        ]
      ]
    ]
  ]
  "declinations" => array:2 [в–ј
    0 => array:10 [в–ј
      "taxes" => array:1 [в–¶]
      "id" => "k2oozxne"
      "reference" => "1301100017DL"
      "full_price" => 21
      "in_stock" => true
      "deprecated" => false
      "test" => false
      "ignore_stock" => true
      "variations" => array:1 [в–¶]
      "stock_quantity" => 0
    ]
    1 => array:10 [в–ј
      "taxes" => array:1 [в–¶]
      "id" => "k2oozxnf"
      "reference" => "1301100017GL"
      "full_price" => 21
      "in_stock" => true
      "deprecated" => false
      "test" => false
      "ignore_stock" => true
      "variations" => array:1 [в–¶]
      "stock_quantity" => -1
    ]
  ]
]
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inside each article there are "variations" I would like to be able to create a table including all the variations UNIQUE with the values ​​UNIQUE.

I started doing something like this which gets all the variations but without the values. I would like to be able to inject all the values ​​that correspond to the variations into it. Example:

main => [
'droite',
'gauche']

$attributes = [];
            foreach ($articles as $article) {
                if ($article['variations']) {
                    foreach ($article['variations'] as $key => $variation) {
                        $attrName = trim(str_replace(':', '', $variation['key']));
                        $attributes[] = $attrName;
                    }
                }
            }

            dump(array_unique($attributes));
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Thank you for your help.

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