(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
pg_lo_export — 將大型對象導出到文件
$connection = ?, int $oid, string $pathname): boolpg_lo_export() takes a large object in a PostgreSQL database and saves its contents to a file on the local filesystem.
要使用大型對象（lo）接口，需要將其放置在事務塊中。
注意:
本函數(shù)以前的名字為
pg_loexport()。
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().
oid要導出的數(shù)據(jù)庫里的大型對象的 OID。
pathname要導出的數(shù)據(jù)庫里的大型對象的文件在客戶端上完整路徑和文件名。
成功時返回 true， 或者在失敗時返回 false。
示例 #1 pg_lo_export() example
<?php
$database = pg_connect("dbname=jacarta");
pg_query($database, "begin");
$oid = pg_lo_create($database);
$handle = pg_lo_open($database, $oid, "w");
pg_lo_write($handle, "large object data");
pg_lo_close($handle);
pg_lo_export($database, $oid, '/tmp/lob.dat');
pg_query($database, "commit");
?>