Avoiding overwriting of private members redeclared in derived classes

src/Exporter.php

@@ -144,28 +144,13 @@ public function toArray($value)
         }
 
         $array = [];
-
+        $className = get_class($value);
         foreach ((array) $value as $key => $val) {
-            // Exception traces commonly reference hundreds to thousands of
-            // objects currently loaded in memory. Including them in the result
-            // has a severe negative performance impact.
-            if ("\0Error\0trace" === $key || "\0Exception\0trace" === $key) {
-                continue;
-            }
-
-            // properties are transformed to keys in the following way:
-            // private   $property => "\0Classname\0property"
-            // protected $property => "\0*\0property"
-            // public    $property => "property"
-            if (\preg_match('/^\0.+\0(.+)$/', (string) $key, $matches)) {
-                $key = $matches[1];
-            }
-
-            // See https://github.com/php/php-src/commit/5721132
-            if ($key === "\0gcdata") {
+            if ($this->ignoreKey($key)) {
                 continue;
             }
 
+            $key = $this->getExportedKey($key, $className);
             $array[$key] = $val;
         }
 
@@ -184,6 +169,40 @@ public function toArray($value)
         return $array;
     }
 
+    private function ignoreKey($key) {
+        // Exception traces commonly reference hundreds to thousands of
+        // objects currently loaded in memory. Including them in the result
+        // has a severe negative performance impact.
+        if ("\0Error\0trace" === $key || "\0Exception\0trace" === $key) {
+            return true;
+        }
+
+        // See https://github.com/php/php-src/commit/5721132
+        if ($key === "\0gcdata") {
+            return true;
+        }
+
+        return false;
+    }
+
+    private function getExportedKey($key, $className)
+    {
+        // properties are transformed to keys in the following way:
+        // private   $property => "\0Classname\0property"
+        // protected $property => "\0*\0property"
+        // public    $property => "property"
+        $ignoredPrefixes = array("", "*", $className);
+        if (\preg_match('/^\0(.+)\0(.+)$/', (string) $key, $matches)) {
+            if (in_array($matches[1], $ignoredPrefixes)) {
+                $key = $matches[2];
+            } else {
+                $key = "{$matches[1]}::{$matches[2]}";
+            }
+        }
+
+        return $key;
+    }
+
     /**
      * Recursive implementation of export
      *