Separation of concerns

src/PDF/Metadata.php

@@ -31,19 +31,28 @@ class Metadata
     public ?string $title = null;
     public ?string $userproperties = null;
 
-    public function fillWith(array $array): Metadata
+    private function __construct(array $array)
     {
         $slugify = new Slugify(['separator' => '_']);
+        $notEmpty = static fn(string $v) => trim($v) !== '';
 
-        $array = array_filter($array, static fn(string $v) => trim($v) !== '');
+        $array = array_filter($array, $notEmpty);
         foreach ($array as $key => $value) {
             $key = $slugify->slugify($key);
             if (property_exists(__CLASS__, $key)) {
                 $this->{$key} = trim($value);
             }
         }
+    }
 
-        return $this;
+    public static function fill(array $data): Metadata
+    {
+        return new self($data);
+    }
+
+    public static function empty(): Metadata
+    {
+        return new self([]);
     }
 
     public function toArray(): array