Truncates a large object

# pg_lo_truncate

(PHP 5 >= 5.6.0, PHP 7)

pg_lo_truncate — Truncates a large object

### 説明

pg_lo_truncate ( resource `$large_object` , int `$size` ) : bool

pg_lo_truncate() truncates a large object resource.

To use the large object interface, it is necessary to enclose it within a transaction block.

### パラメータ

`large_object`

  PostgreSQL large object (LOB) resource, returned by pg_lo_open().

`size`

  The number of bytes to truncate.

### 返り値

成功した場合に `TRUE` を、失敗した場合に `FALSE` を返します。

### 例

例1 pg_lo_truncate() example

`<?php
$doc_oid = 189762345;
$database = pg_connect("dbname=jacarta");
pg_query($database, "begin");
$handle = pg_lo_open($database, $doc_oid, "r");
// Truncate to 0
pg_lo_truncate($handle, 0);
pg_query($database, "commit");
echo $data;
?>`

### 変更履歴

バージョン | 説明
--- | ---
5.6.0 | Added truncate function. It supports PostgreSQL 9.3's 64bit large object. Both client and server must support PostgreSQL 9.3 and PHP must be 64bit build to use 64bit large object.

### 参考

- pg_lo_tell() - ラージオブジェクトのカレントのシーク位置を返す