Fix "diff" result for dates and other objects

src/Utils/ArrayDiff.php

@@ -37,7 +37,9 @@ public function diff($oldData, $newData)
             $old = \array_key_exists($field, $oldData) ? $oldData[$field] : null;
             $new = \array_key_exists($field, $newData) ? $newData[$field] : null;
 
-            if ($old === $new) {
+            // If the values are objects, we will compare them by their properties.
+            // This is necessary because the strict comparison operator (===) will return false if the objects are not the same instance.
+            if ((\is_object($old) && \is_object($new) && $this->compareObjects($old, $new)) || ($old === $new)) {
                 $row = ['old' => '', 'new' => '', 'same' => $old];
             } else {
                 $row = ['old' => $old, 'new' => $new, 'same' => ''];
@@ -48,4 +50,42 @@ public function diff($oldData, $newData)
 
         return $diff;
     }
+
+    /**
+     * Compare the type and the property values of two objects.
+     * Return true if they are the same, false otherwise.
+     * If the type is the same and all properties are the same, this will return true, even if they are not the same instance.
+     * This method is different from comparing two objects using ==,
+     * because internally the strict comparison operator (===) is used to compare the properties.
+     *
+     * @see https://www.php.net/manual/en/language.oop5.object-comparison.php
+     */
+    private function compareObjects(object $object1, object $object2): bool
+    {
+        // Check if the objects are of the same type.
+        if ($object1::class !== $object2::class) {
+            return false;
+        }
+
+        // Check if all properties are the same.
+        $obj1Properties = (array) $object1;
+        $obj2Properties = (array) $object2;
+        foreach ($obj1Properties as $key => $value) {
+            if (!\array_key_exists($key, $obj2Properties)) {
+                return false;
+            }
+            if (\is_object($value) && \is_object($obj2Properties[$key])) {
+                if (!$this->compareObjects($value, $obj2Properties[$key])) {
+                    return false;
+                }
+
+                continue;
+            }
+            if ($value !== $obj2Properties[$key]) {
+                return false;
+            }
+        }
+
+        return true;
+    }
 }

tests/Utils/ArrayDiffTest.php

@@ -0,0 +1,120 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This file is part of the Sonata Project package.
+ *
+ * (c) Thomas Rabaix <[email protected]>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Sonata\EntityAuditBundle\Tests\Utils;
+
+use PHPUnit\Framework\TestCase;
+use SimpleThings\EntityAudit\Utils\ArrayDiff;
+
+final class ArrayDiffTest extends TestCase
+{
+    public function testDiff(): void
+    {
+        $diff = new ArrayDiff();
+        $array1 = ['one' => 'I', 'two' => '2'];
+        $array2 = ['one' => 'I', 'two' => 'II'];
+        $expected = ['one' => ['old' => '', 'new' => '', 'same' => 'I'], 'two' => ['old' => '2', 'new' => 'II', 'same' => '']];
+
+        $result = $diff->diff($array1, $array2);
+
+        static::assertSame($expected, $result);
+    }
+
+    public function testDiffIsCaseSensitive(): void
+    {
+        $diff = new ArrayDiff();
+        $array1 = ['one' => 'I', 'two' => 'ii'];
+        $array2 = ['one' => 'I', 'two' => 'II'];
+        $expected = ['one' => ['old' => '', 'new' => '', 'same' => 'I'], 'two' => ['old' => 'ii', 'new' => 'II', 'same' => '']];
+
+        $result = $diff->diff($array1, $array2);
+
+        static::assertSame($expected, $result);
+    }
+
+    public function testDiffDate(): void
+    {
+        $diff = new ArrayDiff();
+
+        $dateInstance1 = new \DateTimeImmutable('2014-01-01 00:00:00.000000');
+        $dateInstance2 = new \DateTimeImmutable('2014-01-01 00:00:00.000000');
+
+        $array1 = ['date' => $dateInstance1];
+        $array2 = ['date' => $dateInstance2];
+        $expected = ['date' => ['old' => '', 'new' => '', 'same' => $dateInstance1]];
+
+        $result = $diff->diff($array1, $array2);
+
+        static::assertSame($expected, $result);
+    }
+
+    public function testDiffDateDifferent(): void
+    {
+        $diff = new ArrayDiff();
+
+        $dateInstance1 = new \DateTimeImmutable('2014-01-01 00:00:00.000000');
+        $dateInstance2 = new \DateTimeImmutable('2014-01-02 00:00:00.000000');
+
+        $array1 = ['date' => $dateInstance1];
+        $array2 = ['date' => $dateInstance2];
+        $expected = ['date' => ['old' => $dateInstance1, 'new' => $dateInstance2, 'same' => '']];
+
+        $result = $diff->diff($array1, $array2);
+
+        static::assertSame($expected, $result);
+    }
+
+    public function testDiffDateSameButTimezoneDifferent(): void
+    {
+        $diff = new ArrayDiff();
+
+        $dateInstance1 = new \DateTimeImmutable('2014-01-01 00:00:00.000000', new \DateTimeZone('Europe/Luxembourg'));
+        $dateInstance2 = new \DateTimeImmutable('2014-01-01 00:00:00.000000', new \DateTimeZone('UTC'));
+
+        $array1 = ['date' => $dateInstance1];
+        $array2 = ['date' => $dateInstance2];
+        $expected = ['date' => ['old' => $dateInstance1, 'new' => $dateInstance2, 'same' => '']];
+
+        $result = $diff->diff($array1, $array2);
+
+        static::assertSame($expected, $result);
+    }
+
+    public function testDiffObjectSame(): void
+    {
+        $diff = new ArrayDiff();
+        $object1 = (object) ['one' => 'I', 'two' => 'II'];
+        $object2 = (object) ['one' => 'I', 'two' => 'II'];
+        $array1 = ['object' => $object1];
+        $array2 = ['object' => $object2];
+        $expected = ['object' => ['old' => '', 'new' => '', 'same' => $object1]];
+
+        $result = $diff->diff($array1, $array2);
+
+        static::assertSame($expected, $result);
+    }
+
+    public function testDiffObjectDifferent(): void
+    {
+        $diff = new ArrayDiff();
+        $object1 = (object) ['one' => 'I', 'two' => 'ii'];
+        $object2 = (object) ['one' => 'I', 'two' => 'II'];
+        $array1 = ['object' => $object1];
+        $array2 = ['object' => $object2];
+        $expected = ['object' => ['old' => $object1, 'new' => $object2, 'same' => '']];
+
+        $result = $diff->diff($array1, $array2);
+
+        static::assertSame($expected, $result);
+    }
+}