Fix bug #62373 (serialize() generates wrong reference to the object)

Author: moriyoshi

ext/standard/tests/serialize/bug62373.phpt

@@ -0,0 +1,25 @@
+--TEST--
+Bug #62373 (serialize() generates wrong reference to the object)
+--FILE--
+<?php
+class A {}
+class B {}
+
+$size_of_ce = (((int)(log(PHP_INT_MAX) / log(2)) + 1 == 32 ? 368: 680) + 15) & ~15;
+$dummy = array();
+$b = new B();
+$period = $size_of_ce << 5;
+for ($i = 0; $i < $period * 3; $i++) {
+    $a = new A();
+    $s = unserialize(serialize(array($b, $a)));
+    if ($s[0] === $s[1]) {
+        echo "OOPS\n";
+        break; 
+    }
+    $dummy[] = $a;
+}
+
+echo "OK\n";
+?>
+--EXPECT--
+OK

ext/standard/var.c

@@ -541,12 +541,9 @@ static inline int php_add_var_hash(HashTable *var_hash, zval *var, void *var_old
 
 	/* relies on "(long)" being a perfect hash function for data pointers,
 	 * however the actual identity of an object has had to be determined
-	 * by its object handle and the class entry since 5.0. */
+	 * by its object handle since 5.0. */
 	if ((Z_TYPE_P(var) == IS_OBJECT) && Z_OBJ_HT_P(var)->get_class_entry) {
-		p = smart_str_print_long(id + sizeof(id) - 1,
-				(((size_t)Z_OBJCE_P(var) << 5)
-				| ((size_t)Z_OBJCE_P(var) >> (sizeof(long) * 8 - 5)))
-				+ (long) Z_OBJ_HANDLE_P(var));
+		p = smart_str_print_long(id + sizeof(id) - 1, (long) Z_OBJ_HANDLE_P(var));
 		*(--p) = 'O';
 		len = id + sizeof(id) - 1 - p;
 	} else {