From:             
Operating system: Linux
PHP version:      5.3.6
Package:          Scripting Engine problem
Bug Type:         Bug
Bug description:instanceof should fail compile-time if checking for non 
existant class

Description:
------------
If the use clause is missing (class/interface not found in current
namespace) trigger some fatal error.



This would catch many errors when the use clause

is just forgotten by developer.



I would understand the current behavior for those cases:



1) $a instanceof $b

2) $a instanceof 'BarClass' (not supported currently afaik)





Test script:
---------------
<?php



namespace Test;



// use FooNamespace\BarClass;



$a = new \stdClass();

var_dump($a instanceof BarClass);

Expected result:
----------------
Fatal error or at least some Exception.

Actual result:
--------------
bool(false)

-- 
Edit bug report at http://bugs.php.net/bug.php?id=55000&edit=1
-- 
Try a snapshot (PHP 5.2):            
http://bugs.php.net/fix.php?id=55000&r=trysnapshot52
Try a snapshot (PHP 5.3):            
http://bugs.php.net/fix.php?id=55000&r=trysnapshot53
Try a snapshot (trunk):              
http://bugs.php.net/fix.php?id=55000&r=trysnapshottrunk
Fixed in SVN:                        
http://bugs.php.net/fix.php?id=55000&r=fixed
Fixed in SVN and need be documented: 
http://bugs.php.net/fix.php?id=55000&r=needdocs
Fixed in release:                    
http://bugs.php.net/fix.php?id=55000&r=alreadyfixed
Need backtrace:                      
http://bugs.php.net/fix.php?id=55000&r=needtrace
Need Reproduce Script:               
http://bugs.php.net/fix.php?id=55000&r=needscript
Try newer version:                   
http://bugs.php.net/fix.php?id=55000&r=oldversion
Not developer issue:                 
http://bugs.php.net/fix.php?id=55000&r=support
Expected behavior:                   
http://bugs.php.net/fix.php?id=55000&r=notwrong
Not enough info:                     
http://bugs.php.net/fix.php?id=55000&r=notenoughinfo
Submitted twice:                     
http://bugs.php.net/fix.php?id=55000&r=submittedtwice
register_globals:                    
http://bugs.php.net/fix.php?id=55000&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=55000&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=55000&r=dst
IIS Stability:                       
http://bugs.php.net/fix.php?id=55000&r=isapi
Install GNU Sed:                     
http://bugs.php.net/fix.php?id=55000&r=gnused
Floating point limitations:          
http://bugs.php.net/fix.php?id=55000&r=float
No Zend Extensions:                  
http://bugs.php.net/fix.php?id=55000&r=nozend
MySQL Configuration Error:           
http://bugs.php.net/fix.php?id=55000&r=mysqlcfg

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