PHP. Учебник. 2005

dio_seek

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dio_seek

(PHP 4 >= 4.2.0, PECL)dio_seek -- Seeks to pos on fd from whence

Описание

int dio_seek ( resource fd, int pos [, int whence] )


- The function dio_seek() is used to change the file position of the given file descriptor.

Список параметров

-

fd

- The file descriptor returned by dio_open().

pos

- The new position.

whence

- Specifies how the position pos should be interpreted:

- SEEK_SET (default) - specifies that pos is specified from the beginning of the file.

  • - SEEK_CUR - Specifies that pos is a count of characters from the current file position. This count may be positive or negative.
  • - SEEK_END - Specifies that pos is a count of characters from the end of the file. A negative count specifies a position within the current extent of the file; a positive count specifies a position past the current end. If you set the position past the current end, and actually write data, you will extend the file with zeros up to that position.

    • Возвращаемые значения

    Примеры

    -

    Пример 1. Positioning in a file

    <?php

    $fd     = dio_open('/dev/ttyS0', O_RDWR);

    dio_seek($fd, 10, SEEK_SET);
    // position is now at 10 characters from the start of the file

    dio_seek($fd, -2, SEEK_CUR);
    // position is now at 8 characters from the start of the file

    dio_seek($fd, -5, SEEK_END);
    // position is now at 5 characters from the end of the file

    dio_seek($fd, 10, SEEK_END);
    // position is now at 10 characters past the end of the file.
    // The 10 characters between the end of the file and the current
    // position are filled with zeros.

    dio_close($fd);
    ?>

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