How to call grandparent method without getting E_STRICT error?

Question

Sometimes I need to execute grandparent method (that is, bypass the parent method), I know this is code smell, but sometimes I can\'t change the other classes (frameworks, l

Answer 1

Timo's answer works but I think it works by accident more than by design. If you look at the opcodes for a $this->doX vs a parent::doX vs a Grandparent::doX you can see that Grandparent::doX is invoked as a static method but PHP will use the $this that's in scope

$this->doX
  17     1        EXT_STMT                                                 
         2        INIT_METHOD_CALL                               'doX'
         3        EXT_FCALL_BEGIN                                          
         4        DO_FCALL                                      0          
         5        EXT_FCALL_END                                            

parent::doX
  18     6        EXT_STMT                                                 
         7        FETCH_CLASS                                 514  :1      
         8        INIT_STATIC_METHOD_CALL                     $1, 'doX'
         9        EXT_FCALL_BEGIN                                          
        10        DO_FCALL                                      0          
        11        EXT_FCALL_END                                            

Grandparent::doX
  19    12        EXT_STMT                                                 
        13        INIT_STATIC_METHOD_CALL                  'C1', 'doX'
        14        EXT_FCALL_BEGIN                                          
        15        DO_FCALL                                      0          
        16        EXT_FCALL_END                                            

The $this parameter is available in the Grandparent's static invocation because of this (from https://www.php.net/manual/en/language.oop5.basic.php):

The pseudo-variable $this is available when a method is called from within an object context. $this is a reference to the calling object (usually the object to which the method belongs, but possibly another object, if the method is called statically from the context of a secondary object). As of PHP 7.0.0 calling a non-static method statically from an incompatible context results in $this being undefined inside the method. Calling a non-static method statically from an incompatible context has been deprecated as of PHP 5.6.0. As of PHP 7.0.0 calling a non-static method statically has been generally deprecated (even if called from a compatible context). Before PHP 5.6.0 such calls already triggered a strict notice.