(PHP 4, PHP 5, PHP 7)
gzrewind — Rewind the position of a gz-file pointer
$zp
) : boolSets the file position indicator of the given gz-file pointer to the beginning of the file stream.
zpThe gz-file pointer. It must be valid, and must point to a file successfully opened by gzopen().
成功时返回 TRUE， 或者在失败时返回 FALSE。