getting BLOBS (ORACLE) back to filesystem

first of all, i´m a newbie in newsgroups and my english is not very well. please apologize if anything is not that accurate. i need help with following problem urgently, please! i successfully stored blobs in an oracle table via php. but it seems to be impossible getting them back to filesystem! It is a binary (no picture or executable) which arives via mail and is written into a unix-filesystem. i´ve stored this binary as blob datatype together with other informations in a table with the help of a php-script. afterwards the binary will be deleted from filesystem. If the binary is to be used again, it should be read out of the database and written back into the unix-filesystem. I need a solution for the last part. Any help would be great! tia elke