Getting File Contents, Speed and Efficiency

Does anyone know which would be more efficient to use?

PHP Code:

---

ob_start();
include("path/to.php");
$data = ob_get_contents(); 


---

OR

PHP Code:

---

$fp = fopen("path/to.php","r") 
        while(! feof($fp)){
            $data.=fgets($fp,1024);
        } 


---

Thanks for answering stupid questions :p

They do different things. The first executes the contents of the file and puts the result in the buffer. The second gets the source itself, unless you specify a HTTP url.