Description:
------------
<?php
class Test {
        protected $protectedProperty;
}

$test = new Test();

var_dump(isset($test->protectedProperty->foo));

This produces fatal error. However this:

var_dump(isset($test->protectedProperty));

produces bool(false) - even though the very same protected property is accessed. 
This is obviously inconsistent. It looks like this is caused by this code in 
zend_std_read_property:

	property_info = zend_get_property_info_quick(zobj->ce, member, (zobj-
>ce->__get != NULL), key TSRMLS_CC);

This sets property getter to "silent" for "get" requests, but not for "isset" 
requests, even though code immediately above is:

	silent = (type == BP_VAR_IS);

But 'silent' value is ignored for zend_get_property_info_quick and it is allowed 
to produce the fatal error, even though has_property() handler in this situation 
does not. 

Test script:
---------------
<?php
class Test {
        protected $protectedProperty;
}

$test = new Test();

var_dump(isset($test->protectedProperty->foo));

Expected result:
----------------
bool(false)

Actual result:
--------------
Fatal error: Cannot access protected property Test::$protectedProperty