(PHP 4, PHP 5) gzseek — Seek on a gz-file pointer
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:
gzseek
说明
int gzseek
( resource $zp
, int $offset
[, int $whence = SEEK_SET
] )
参数
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 gzseek() example
<?php
$gz = gzopen('somefile.gz', 'r');
gzseek($gz,2);
echo gzgetc($gz);
gzclose($gz);
?>