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dio_seek
(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)
dio_seek — Seeks to pos on fd from whence
Description
$fd
, int $pos
[, int $whence
= SEEK_SET
] ) : intThe function dio_seek() is used to change the file position of the given file descriptor.
Parameters
-
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 thatpos
is specified from the beginning of the file. -
SEEK_CUR
- Specifies thatpos
is a count of characters from the current file position. This count may be positive or negative. -
SEEK_END
- Specifies thatpos
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.
-
Examples
Example #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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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-dio-seek.html
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References
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