pg_lo_tell

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

pg_lo_tell — Returns current seek position a of large object

Descrierea

pg_lo_tell ( resource $large_object ) : int

pg_lo_tell() returns the current position (offset from the beginning) of a large object.

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

Parametri

large_object

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

Valorile întoarse

The current seek offset (in number of bytes) from the beginning of the large object. If there is an error, the return value is negative.

Exemple

Example #1 pg_lo_tell() 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);
   // See how far we've skipped
   $offset = pg_lo_tell($handle);
   echo "Seek position is: $offset";
   pg_query($database, "commit");
?>

Exemplul de mai sus va afișa:

Seek position is: 50000

Istoricul schimbărilor

Versiune Descriere
5.6.0 Added PostgreSQL 9.3's 64bit large object support. Both client and server must support PostgreSQL 9.3 and PHP must be 64bit build to use 64bit large object.

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