Definir una funcion(algo) y ejecutarla despues

[Ronruby]

I have founda that trying to delete a file using relative path like the example below does not work.

Código PHP:

  <?php 
    $do = unlink("../pics/$fileToDel"); 
    if($do=="1"){ 
        echo "The file was deleted successfully."; 
    } else { echo "There was an error trying to delete the file."; } 
?>   

I did not work at all, instead what I had to do was:

Código PHP:

  <?php 
    chdir('../pics/'); 
    $do = unlink($fileToDel); 
    if($do=="1"){ 
        echo "The file was deleted successfully."; 
    } else { echo "There was an error trying to delete the file."; } 
?>   

Then it worked !

http://www.php.net/manual/en/function.unlink.php#80110