取得大型物件大小的函式
<?php
函式 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;
}
?>
(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
pg_lo_tell — 傳回大型物件的目前搜尋位置
從大型物件開頭算起的目前搜尋偏移量（以位元組為單位）。如果發生錯誤，則傳回值為負數。
範例 #1 pg_lo_tell() 範例
<?php
$doc_oid = 189762345;
$database = pg_connect("dbname=jacarta");
pg_query($database, "begin");
$handle = pg_lo_open($database, $doc_oid, "r");
// 跳過前 50000 個位元組
pg_lo_seek($handle, 50000, PGSQL_SEEK_SET);
// 查看我們跳過了多遠
$offset = pg_lo_tell($handle);
echo "搜尋位置為： $offset";
pg_query($database, "commit");
?>以上範例將輸出
Seek position is: 50000