Core/src/Iterator/PageIteratorTrait.php
public function next()
    {
        $this->position++;
        $this->page = $this->nextResultToken()
            ? $this->executeCall()
            : null;
    }
public function next()
    {
        $this->position++;
        $this->page = $this->nextResultToken()
            ? $this->executeCall()
            : null;
    }
public function next ( ) { $ this -> position ++ ; $ this -> page = $ this -> nextResultToken ( ) ? $ this -> executeCall ( ) : null ; }
Advances to the next page.

@return null
Advances to the next page .