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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

    Descrição

    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.

    Parâmetros

    lob

    Uma instância de PgSql\Lob, retornada por 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) .

    Valor Retornado

    Retorna true em caso de sucesso ou false em caso de falha.

    Registro de Alterações

    Versão Descrição
    8.1.0 O parâmetro lob agora espera uma instância de PgSql\Lob; anteriormente, um resource era esperado.

    Exemplos

    Exemplo #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;
    ?>

    Veja Também

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

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