Fix deep copying of ArrayObject in PHP 7.4

In PHP 7.4 the storage of an ArrayObject isn't returned as
ReflectionProperty.

src/DeepCopy/DeepCopy.php

@@ -2,19 +2,21 @@
 
 namespace DeepCopy;
 
+use ArrayObject;
 use DateInterval;
 use DateTimeInterface;
 use DateTimeZone;
 use DeepCopy\Exception\CloneException;
 use DeepCopy\Filter\Filter;
 use DeepCopy\Matcher\Matcher;
+use DeepCopy\Reflection\ReflectionHelper;
 use DeepCopy\TypeFilter\Date\DateIntervalFilter;
+use DeepCopy\TypeFilter\Spl\ArrayObjectFilter;
 use DeepCopy\TypeFilter\Spl\SplDoublyLinkedListFilter;
 use DeepCopy\TypeFilter\TypeFilter;
 use DeepCopy\TypeMatcher\TypeMatcher;
 use ReflectionObject;
 use ReflectionProperty;
-use DeepCopy\Reflection\ReflectionHelper;
 use SplDoublyLinkedList;
 
 /**
@@ -59,6 +61,7 @@ public function __construct($useCloneMethod = false)
     {
         $this->useCloneMethod = $useCloneMethod;
 
+        $this->addTypeFilter(new ArrayObjectFilter($this), new TypeMatcher(ArrayObject::class));
         $this->addTypeFilter(new DateIntervalFilter(), new TypeMatcher(DateInterval::class));
         $this->addTypeFilter(new SplDoublyLinkedListFilter($this), new TypeMatcher(SplDoublyLinkedList::class));
     }

src/DeepCopy/TypeFilter/Spl/ArrayObjectFilter.php

@@ -0,0 +1,36 @@
+<?php
+namespace DeepCopy\TypeFilter\Spl;
+
+use ArrayObject;
+use DeepCopy\DeepCopy;
+use DeepCopy\TypeFilter\TypeFilter;
+
+/**
+ * In PHP 7.4 the storage of an ArrayObject isn't returned as
+ * ReflectionProperty. So we deep copy its array copy.
+ */
+final class ArrayObjectFilter implements TypeFilter
+{
+    /**
+     * @var DeepCopy
+     */
+    private $copier;
+
+    public function __construct(DeepCopy $copier)
+    {
+        $this->copier = $copier;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function apply($arrayObject)
+    {
+        return new ArrayObject(
+            $this->copier->copy($arrayObject->getArrayCopy()),
+            $arrayObject->getFlags(),
+            $arrayObject->getIteratorClass()
+        );
+    }
+}
+

tests/DeepCopyTest/DeepCopyTest.php

@@ -2,6 +2,7 @@
 
 namespace DeepCopyTest;
 
+use ArrayObject;
 use DateInterval;
 use DateTime;
 use DateTimeImmutable;
@@ -24,6 +25,7 @@
 use DeepCopy\TypeFilter\ShallowCopyFilter;
 use DeepCopy\TypeMatcher\TypeMatcher;
 use PHPUnit\Framework\TestCase;
+use RecursiveArrayIterator;
 use SplDoublyLinkedList;
 use stdClass;
 use function DeepCopy\deep_copy;
@@ -385,6 +387,18 @@ public function test_it_uses_the_first_filter_matching_for_copying_object_proper
         $this->assertNull($copy->getAProp()->cloned);
     }
 
+    public function test_it_can_deep_copy_an_array_object()
+    {
+        $foo = new f003\Foo('foo');
+        $foo->setProp('bar');
+        $object = new ArrayObject(['foo' => $foo, \ArrayObject::ARRAY_AS_PROPS, \RecursiveArrayIterator::class]);
+
+        $copy = deep_copy($object);
+
+        $this->assertEqualButNotSame($object, $copy);
+        $this->assertEqualButNotSame($foo, $copy['foo']);
+    }
+
     /**
      * @ticket https://github.com/myclabs/DeepCopy/pull/49
      */

tests/DeepCopyTest/TypeFilter/Spl/ArrayObjectFilterTest.php

@@ -0,0 +1,48 @@
+<?php declare(strict_types=1);
+
+namespace DeepCopyTest\TypeFilter\Spl;
+
+use ArrayObject;
+use DeepCopy\DeepCopy;
+use DeepCopy\TypeFilter\Spl\ArrayObjectFilter;
+use PHPUnit\Framework\TestCase;
+use Prophecy\Prophecy\ObjectProphecy;
+use RecursiveArrayIterator;
+
+/**
+ * @author Dominic Tubach <dominic.tubach@to.com>
+ *
+ * @covers \DeepCopy\TypeFilter\Spl\ArrayObjectFilter
+ */
+final class ArrayObjectFilterTest extends TestCase
+{
+    /**
+     * @var ArrayObjectFilter
+     */
+    private $arrayObjectFilter;
+
+    /**
+     * @var DeepCopy|ObjectProphecy
+     */
+    private $copierProphecy;
+
+    protected function setUp(): void
+    {
+        $this->copierProphecy = $this->prophesize(DeepCopy::class);
+        $this->arrayObjectFilter = new ArrayObjectFilter(
+            $this->copierProphecy->reveal()
+        );
+    }
+
+    public function test_it_deep_copies_an_array_object(): void
+    {
+        $arrayObject = new ArrayObject(['foo' => 'bar'], ArrayObject::ARRAY_AS_PROPS, RecursiveArrayIterator::class);
+        $this->copierProphecy->copy(['foo' => 'bar'])->willReturn(['copy' => 'bar']);
+
+        /** @var \ArrayObject $newArrayObject */
+        $newArrayObject = $this->arrayObjectFilter->apply($arrayObject);
+        $this->assertSame(['copy' => 'bar'], $newArrayObject->getArrayCopy());
+        $this->assertSame(ArrayObject::ARRAY_AS_PROPS, $newArrayObject->getFlags());
+        $this->assertSame(RecursiveArrayIterator::class, $newArrayObject->getIteratorClass());
+    }
+}