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.
Return Values
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.
