[VarDumper] #131135: Use \ReflectionReference for determining if a value is reference(php7.4 only).

dorumd · dorumd · commit bf8a9b227fd6 · 2019-04-28T12:26:51.000+02:00
diff --git a/src/Symfony/Component/VarDumper/Cloner/VarCloner.php b/src/Symfony/Component/VarDumper/Cloner/VarCloner.php
@@ -85,9 +85,15 @@ protected function doClone($var)
                 }
             }
             foreach ($vals as $k => $v) {
-                // $v is the original value or a stub object in case of hard references
-                $refs[$k] = $cookie;
-                if ($zvalIsRef = $vals[$k] === $cookie) {
+                if (\PHP_VERSION_ID >= 70400) {
+                    // see https://wiki.php.net/rfc/reference_reflection
+                    $zvalIsRef = null !== \ReflectionReference::fromArrayElement($vals, $k);
+                } else {
+                    $refs[$k] = $cookie; // $v is the original value or a stub object in case of hard references
+                    $zvalIsRef = $vals[$k] === $cookie;
+                }
+
+                if ($zvalIsRef) {
                     $vals[$k] = &$stub;         // Break hard references to make $queue completely
                     unset($stub);               // independent from the original structure
                     if ($v instanceof Stub && isset($hardRefs[\spl_object_hash($v)])) {
diff --git a/src/Symfony/Component/VarDumper/Tests/Dumper/CliDumperTest.php b/src/Symfony/Component/VarDumper/Tests/Dumper/CliDumperTest.php
@@ -230,7 +230,20 @@ public function testJsonCast()
         $var[] = &$v;
         $var[''] = 2;
 
-        if (\PHP_VERSION_ID >= 70200) {
+        if (\PHP_VERSION_ID >= 70400) {
+            $this->assertDumpMatchesFormat(
+                <<<'EOTXT'
+array:4 [
+  0 => & {}
+  1 => &2 null
+  2 => &2 null
+  "" => 2
+]
+EOTXT
+                ,
+                $var
+            );
+        } elseif (\PHP_VERSION_ID >= 70200) {
             $this->assertDumpMatchesFormat(
                 <<<'EOTXT'
 array:4 [
