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PHP. Руководство по PHP. 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);

    ?>

    Пред.

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    dio_read

    Уровень выше

    dio_stat

    Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

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