public function valid() {
		if ($this->string === null) {
			$this->string = fgets($this->file);
		}
		
		return $this->string === false ? false : true;
	}
public function valid() {
		if ($this->string === null) {
			$this->string = fgets($this->file);
		}
		
		return $this->string === false ? false : true;
	}
public function valid ( ) { if ( $ this -> string === null ) { $ this -> string = fgets ( $ this -> file ) ; } return $ this -> string === false ? false : true ; }
Is the position valid ?

@return bool
Is the position valid ?