The cubrid_lob_get function executes SQL statement and returns the value of every BLOB/CLOB type in resource array. Be sure that the SQL should have only one column and the type must be BLOB/CLOB.
Remember to use cubrid_lob_close() to release the BLOB or CLOB if you don't need it any more.
array cubrid_lob_get (resource $conn_identifier, string $SQL)
<?php
$lobs = cubrid_lob_get($con, "SELECT doc_content FROM doc WHERE doc_id=5");
cubrid_lob_export($conn, $lobs[0], "doc_5.txt");
cubrid_lob_close($lobs);
?>