original_string: protected function getInputSource()
      {
          if (empty($this->children)) {
              return parent::getInputSource();
          }
  
          $childPaths = [];
          foreach ($this->children as $child) {
            $childPaths[] = $child->getInputSource();
          }
  
          return implode(" ", $childPaths);
      }
code: protected function getInputSource()
      {
          if (empty($this->children)) {
              return parent::getInputSource();
          }
  
          $childPaths = [];
          foreach ($this->children as $child) {
            $childPaths[] = $child->getInputSource();
          }
  
          return implode(" ", $childPaths);
      }
code_tokens: protected function getInputSource ( ) { if ( empty ( $ this -> children ) ) { return parent :: getInputSource ( ) ; } $ childPaths = [ ] ; foreach ( $ this -> children as $ child ) { $ childPaths [ ] = $ child -> getInputSource ( ) ; } return implode ( " " , $ childPaths ) ; }
docstring: Updated version which can handle multiple source files.
  
  @return string
docstring_tokens: Updated version which can handle multiple source files .