gzseek
(PHP 4, PHP 5)
gzseek — Seek on a gz-file pointer
说明
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.
参数
- zp
-
The gz-file pointer. It must be valid, and must point to a file successfully opened by gzopen().
- offset
-
The seeked offset.
返回值
Upon success, returns 0; otherwise, returns -1. Note that seeking past EOF is not considered an error.
范例
Example#1 gzseek() example
<?php
$gz = gzopen('somefile.gz', 'r');
gzseek($gz,2);
echo gzgetc($gz);
gzclose($gz);
?>
