Description:
------------
I found when I extends from a class which is also extended from a class case the complie failed .

the parsing process:
starr:
    top_statement_list
;

top_statement_list:
        top_statement_list 
.... //有省略
;


top_statement:
.... //有省略
    |   class_declaration_statement   
 .... //有省略
;

class_declaration_statement:
        unticked_class_declaration_statement 
;

unticked_class_declaration_statement:
        class_entry_type T_STRING extends_from
.... //有省略
;

class_entry_type:
        T_CLASS
.... //有省略
;

extends_from:
        /* empty */   
    |   T_EXTENDS fully_qualified_class_name
.... //有省略
;
fully_qualified_class_name:
        T_STRING { zend_do_fetch_class(&$$, &$1 TSRMLS_CC); }
;

but if class with named fully_qualified_class_name is also a inherited class , there must be some mechanism to guaranteed the fully_qualified_class_name to be processed first...
class 

Reproduce code:
---------------
<?php
class a extends b {
};
class b extends c{
};
class c{
};
?>

Expected result:
----------------
PHP Fatal error:  Class 'b' not found in /home/xinchen/1.php on line 2
Fatal error: Class 'b' not found in /home/xinchen/1.php on line 2

Actual result:
--------------
http://www.laruence.com/2008/08/24/427.html