pg_lo_seek
(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
pg_lo_seek — Seeks position within a large object
Description
pg_lo_seek(PgSql\Lob $lob, int $offset, int $whence = SEEK_CUR): bool
pg_lo_seek() seeks a position within an PgSql\Lob instance.
To use the large object interface, it is necessary to enclose it within a transaction block.
Parameters
-
lob
-
An PgSql\Lob instance, returned by pg_lo_open().
-
offset
-
The number of bytes to seek.
-
whence
-
One of the constants
PGSQL_SEEK_SET
(seek from object start),PGSQL_SEEK_CUR
(seek from current position) orPGSQL_SEEK_END
(seek from object end) .
Return Values
Returns true
on success or false
on failure.
Changelog
Version | Description |
---|---|
8.1.0 | The lob parameter expects an PgSql\Lob instance now; previously, a resource was expected. |
Examples
Example #1 pg_lo_seek() example
<?php $doc_oid = 189762345; $database = pg_connect("dbname=jacarta"); pg_query($database, "begin"); $handle = pg_lo_open($database, $doc_oid, "r"); // Skip first 50000 bytes pg_lo_seek($handle, 50000, PGSQL_SEEK_SET); // Read the next 10000 bytes $data = pg_lo_read($handle, 10000); pg_query($database, "commit"); echo $data; ?>
See Also
- pg_lo_tell() - Returns current seek position a of large object
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https://www.php.net/manual/en/function.pg-lo-seek.php