(PHP 4, PHP 5)
fseek — Seeks on a file pointer
Sets the file position indicator for the file referenced by
. The new position, measured in bytes
from the beginning of the file, is obtained by adding
to the position specified by
A file system pointer resource
that is typically created using fopen().
To move to a position before the end-of-file, you need to pass a negative
value in offset
is not specified, it is assumed to be
Upon success, returns 0; otherwise, returns -1. Note that seeking
past EOF is not considered an error.
Example #1 fseek() example
<?php$fp = fopen('somefile.txt', 'r');// read some data$data = fgets($fp, 4096);// move back to the beginning of the file// same as rewind($fp);fseek($fp, 0);?>
If you have opened the file in append ("a" or "a+") mode, any data you write
to the file will always be appended, regardless of the file position.
May not be used on file pointers returned by
fopen() if they use the "http://" or "ftp://"
formats. fseek() gives also undefined results for
append-only streams (opened with "a" flag).