pg_lo_tell() returns the current position (offset from the beginning) of a large object.
To use the large object interface, it is necessary to enclose it within a transaction block.
PostgreSQL large object (LOB) resource, returned by pg_lo_open().
The current seek offset (in number of bytes) from the beginning of the large object. If there is an error, the return value is negative.
$doc_oid = 189762345;
$database = pg_connect("dbname=jacarta");
$handle = pg_lo_open($database, $doc_oid, "r");
// Skip first 50000 bytes
pg_lo_seek($handle, 50000, PGSQL_SEEK_SET);
// See how far we've skipped
$offset = pg_lo_tell($handle);
echo "Seek position is: $offset";
The above example will output:
Seek position is: 50000