Sets the file position indicator for the given file pointer to the given offset byte into the file stream. Equivalent to calling (in C) gzseek(zp, offset, SEEK_SET).
If the file is opened for reading, this function is emulated but can be extremely slow. If the file is opened for writing, only forward seeks are supported; gzseek() then compresses a sequence of zeroes up to the new starting position.
The gz-file pointer. It must be valid, and must point to a file successfully opened by gzopen().
The seeked offset.
whence
values are:
-
SEEK_SET
- Set position equal tooffset
bytes. -
SEEK_CUR
- Set position to current location plusoffset
.
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.
<?php $gz = gzopen('somefile.gz', 'r'); gzseek($gz,2); echo gzgetc($gz); gzclose($gz); ?>
gztell() -
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