(PHP 4 >= 4.2.0, PHP 5)
pg_lo_open — Open a large object
$connection
   , int $oid
   , string $mode
   )pg_lo_open() opens a large object in the database and returns large object resource so that it can be manipulated.
Do not close the database connection before closing the large object resource.
To use the large object interface, it is necessary to enclose it within a transaction block.
Note:
This function used to be called pg_loopen().
connection
       PostgreSQL database connection resource.  When 
       connection is not present, the default connection 
       is used. The default connection is the last connection made by 
       pg_connect() or pg_pconnect().
      
oidThe OID of the large object in the database.
modeCan be either "r" for read-only, "w" for write only or "rw" for read and write.
   A large object resource or FALSE on error.
  
Example #1 pg_lo_open() example
<?php
   $database = pg_connect("dbname=jacarta");
   pg_query($database, "begin");
   $oid = pg_lo_create($database);
   echo "$oid\n";
   $handle = pg_lo_open($database, $oid, "w");
   echo "$handle\n";
   pg_lo_write($handle, "large object data");
   pg_lo_close($handle);
   pg_query($database, "commit");
?>