fix bug #63982: isset() inconsistently produces a fatal error on protected property

NEWS

@@ -3,6 +3,8 @@ PHP                                                                        NEWS
 ?? ??? 2012, PHP 5.4.12
 
 - Core:
+  . Fixed bug #63982 (isset() inconsistently produces a fatal error on 
+    protected property). (Stas)
   . Fixed bug #63943 (Bad warning text from strpos() on empty needle).
     (Laruence)
   . Fixed bug #63882 (zend_std_compare_objects crash on recursion). (Dmitry)

Zend/tests/bug63982.phpt

@@ -0,0 +1,15 @@
+--TEST--
+Bug #63982 (isset() inconsistently produces a fatal error on protected property)
+--FILE--
+<?php
+class Test {
+        protected $protectedProperty;
+}
+
+$test = new Test();
+
+var_dump(isset($test->protectedProperty));
+var_dump(isset($test->protectedProperty->foo));
+--EXPECTF--
+bool(false)
+bool(false)

Zend/zend_object_handlers.c

@@ -435,7 +435,7 @@ zval *zend_std_read_property(zval *object, zval *member, int type, const zend_li
 #endif
 
 	/* make zend_get_property_info silent if we have getter - we may want to use it */
-	property_info = zend_get_property_info_quick(zobj->ce, member, (zobj->ce->__get != NULL), key TSRMLS_CC);
+	property_info = zend_get_property_info_quick(zobj->ce, member, silent || (zobj->ce->__get != NULL), key TSRMLS_CC);
 
 	if (UNEXPECTED(!property_info) ||
 	    ((EXPECTED((property_info->flags & ZEND_ACC_STATIC) == 0) &&