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    pg_lo_seek

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

    pg_lo_seek — Seeks position within a large object

    Descripción

    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.

    Parámetros

    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) or PGSQL_SEEK_END (seek from object end) .

    Valores devueltos

    Devuelve true en caso de éxito o false en caso de error.

    Historial de cambios

    Versión Descripción
    8.1.0 The lob parameter expects an PgSql\Lob instance now; previously, a recurso was expected.

    Ejemplos

    Ejemplo #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;
    ?>

    Ver también

    • pg_lo_tell() - Returns current seek position a of large object

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