fix: fix deprecation warning on arrayAccess::offsetGet (#305)

src/Base/Concern/OffsetGetByPhpVersion.php

@@ -0,0 +1,26 @@
+<?php
+// phpcs:ignore Generic.Files.OneTraitPerFile, Generic.Files.OneObjectStructurePerFile
+
+declare(strict_types=1);
+
+namespace MyParcelNL\Pdk\Base\Concern;
+
+/*
+ * Ugly fix for the following error in php 8:
+ *   Return type of MyParcelNL\Pdk\Base\Model\Model::offsetGet($offset) should either be compatible with
+ *   ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to
+ *   temporarily suppress the notice.
+ *
+ * @TODO: Remove this when we no longer have to support PHP 7.
+ */
+if (PHP_VERSION_ID >= 80000) {
+    trait OffsetGetByPhpVersion
+    {
+        use OffsetGetPhp8;
+    }
+} else {
+    trait OffsetGetByPhpVersion
+    {
+        use OffsetGetPhp7;
+    }
+}

src/Base/Concern/OffsetGetPhp7.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace MyParcelNL\Pdk\Base\Concern;
+
+trait OffsetGetPhp7
+{
+    /**
+     * Get the value for a given offset.
+     *
+     * @param  mixed $offset
+     *
+     * @return mixed
+     */
+    public function offsetGet($offset)
+    {
+        return $this->getAttribute($offset);
+    }
+}

src/Base/Concern/OffsetGetPhp8.php

@@ -0,0 +1,21 @@
+<?php
+/** @noinspection PhpUndefinedClassInspection */
+
+declare(strict_types=1);
+
+namespace MyParcelNL\Pdk\Base\Concern;
+
+trait OffsetGetPhp8
+{
+    /**
+     * Get the value for a given offset.
+     *
+     * @param  mixed $offset
+     *
+     * @return mixed
+     */
+    public function offsetGet($offset): mixed
+    {
+        return $this->getAttribute($offset);
+    }
+}

src/Base/Model/Model.php

@@ -6,6 +6,7 @@
 
 use ArrayAccess;
 use MyParcelNL\Pdk\Base\Concern\HasAttributes;
+use MyParcelNL\Pdk\Base\Concern\OffsetGetByPhpVersion;
 use MyParcelNL\Pdk\Base\Contract\Arrayable;
 use MyParcelNL\Pdk\Base\Contract\ModelInterface;
 use MyParcelNL\Pdk\Base\Contract\StorableArrayable;
@@ -17,6 +18,7 @@
  */
 class Model implements StorableArrayable, ArrayAccess, ModelInterface
 {
+    use OffsetGetByPhpVersion;
     use HasAttributes;
 
     /**
@@ -191,18 +193,6 @@ public function offsetExists($offset): bool
         return null !== $this->getAttribute($offset);
     }
 
-    /**
-     * Get the value for a given offset.
-     *
-     * @param  mixed $offset
-     *
-     * @return mixed
-     */
-    public function offsetGet($offset)
-    {
-        return $this->getAttribute($offset);
-    }
-
     /**
      * Set the value for a given offset.
      *