Write to a large object

# pg_lo_write

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_lo_write — Write to a large object

### Description

pg_lo_write(PgSql\Lob `$lob`, string `$data`, ?int `$length` = `null`): int|false

pg_lo_write() writes data into a large object at the current seek position.

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

> Note:

> This function used to be called pg_lowrite().

### Parameters

`lob`

  An PgSql\Lob instance, returned by pg_lo_open().

`data`

  The data to be written to the large object. If `length` is an int and is less than the length of `data`, only `length` bytes will be written.

`length`

  An optional maximum number of bytes to write. Must be greater than zero and no greater than the length of `data`. Defaults to the length of `data`.

### Return Values

The number of bytes written to the large object, or `false` on error.

### Changelog

Version | Description
--- | ---
8.1.0 | The `lob` parameter expects an PgSql\Lob instance now; previously, a resource was expected.
8.0.0 | `length` is now nullable.

### Examples

Example #1 pg_lo_write() example

`<?php
$doc_oid = 189762345;
$data = "This will overwrite the start of the large object.";
$database = pg_connect("dbname=jacarta");
pg_query($database, "begin");
$handle = pg_lo_open($database, $doc_oid, "w");
$data = pg_lo_write($handle, $data);
pg_query($database, "commit");
?>`

### See Also

- pg_lo_create() - Create a large object
- pg_lo_open() - Open a large object

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