pg_lo_tell
(PHP 4 >= 4.2.0, PHP 5)
pg_lo_tell — Returns current seek position a of large object
Description
int pg_lo_tell
( resource
$large_object
)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.
Return Values
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.
Examples
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");
?>
The above example will output:
Seek position is: 50000
Changelog
| Version | Description |
|---|---|
| 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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Коментарии
Function to take a large object size:
<?php
function pg_lo_size ($lo) {
$pos = pg_lo_tell ($lo);
pg_lo_seek ($lo, 0, PGSQL_SEEK_END);
$size = pg_lo_tell ($lo);
pg_lo_seek ($lo, $pos, PGSQL_SEEK_SET);
return $size;
}
?>