int gzseek(resource $zp, int $offset[, int $whence = SEEK_SET])
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.
Upon success, returns 0; otherwise, returns -1. Note that seeking past EOF is not considered an error.
- resource $zp: The gz-file pointer. It must be valid, and must point to a file successfully opened by gzopen().
- int $offset: The seeked offset.
- int $whence [ = SEEK_SET]:
SEEK_SET- Set position equal to
SEEK_CUR- Set position to current location plus
whenceis not specified, it is assumed to be
Example #1 gzseek() example
$gz = gzopen('somefile.gz', 'r');