(PHP 5, PECL OCI8 >= 1.1.0)
OCI-Lob::export — Exports LOB's contents to a file
$filename
   [, int $start
   [, int $length
  ]] )Exports LOB contents to a file.
filename
     Path to the file.
start
     Indicates from where to start exporting.
length
     Indicates the length of data to be exported.
   Returns TRUE on success or FALSE on failure.