The pathname argument specifies the pathname of the file to be imported as a large object. It returns FALSE if an error occurred, oid of the just created large object otherwise.
To use the large object (lo) interface, it is necessary to enclose it within a transaction block.
Note: When safe mode is enabled, PHP checks whether the file(s)/directories you are about to operate on have the same UID as the script that is being executed.
See also pg_loexport() and pg_loopen().