gzseek
gzseek
(PHP 4, PHP 5, PHP 7)
gzseek — Seek on a gz-file pointer
Description
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.
Parameters
-
zp
-
The gz-file pointer. It must be valid, and must point to a file successfully opened by gzopen().
-
offset
-
The seeked offset.
-
whence
-
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 beSEEK_SET
. -
Return Values
Upon success, returns 0; otherwise, returns -1. Note that seeking past EOF is not considered an error.
Examples
Example #1 gzseek() example
<?php $gz = gzopen('somefile.gz', 'r'); gzseek($gz,2); echo gzgetc($gz); gzclose($gz); ?>
See Also
- gztell() - Tell gz-file pointer read/write position
- gzrewind() - Rewind the position of a gz-file pointer
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/function.gzseek.php