fseek
(PHP 3, PHP 4 )
fseek -- Seeks on a file pointer
Description
int fseek ( resource handle, int offset [, int whence])
Sets the file position indicator for the file referenced
by handle.The new position, measured in bytes from the beginning
of the file, is obtained by adding offset to the position
specified by whence, whose values are defined as follows:
SEEK_SET - Set position equal to offset bytes.
SEEK_CUR - Set position to current location plus offset.
SEEK_END - Set position to end-of-file plus offset. (To
move to a position before the end-of-file, you need to pass
a negative value in offset.)
If whence is not specified, it is assumed to be SEEK_SET.
Upon success, returns 0; otherwise, returns -1. Note that
seeking past EOF is not considered an error.
Example 1. fseek() example
<?php
$fp = fopen('somefile.txt');
// read some data
$data = fgets($fp, 4096);
// move back to the beginning of the file
// same as rewind($fp);
fseek($fp, 0);
?>
May not be used on file pointers returned by fopen() if
they use the "http://" or "ftp://" formats.
Note: The whence argument was added after PHP 4.0.0.
See also ftell() and rewind().
