gzopen

(PHP 4, PHP 5)

gzopen — Abre um arquivo-gz

Descrição

resource gzopen ( string $filename , string $mode [, int $use_include_path ] )

Abre um arquivo-gz para leitura ou escrita. O parâmetro mode é igual a fopen() ("rb" ou "wb") mas pode incluir também um nível de compressão ("wb9") ou uma estratégia: 'f' para dados filtrados como em "wb6f", 'h' para compressão apenas com Huffman como em "wb1h". (Veja a descrição de deflateInit2 e zlib.h para maiores informações sobre o parâmetro strategy.)

gzopen() pode ser usada para ler um arquivo que não esteja no formato gzip; neste caso gzread() irá ler diretamente a partir do arquivo sem descompressão.

gzopen() retorna um ponteiro para arquivo aberto, após isso, tudo o que você ler apartir desse descritor de arquivo será transparentemente descomprimido e o que você escrever será comprimido.

Se falhar ao abrir, a função retorna FALSE.

Você pode usar o terceiro parâmetro, que é opcional, e defini-lo como "1", se você quiser procurar pelo arquivo no include_path, também.

Exemplo #1 Exemplo gzopen()


<?php
$fp = gzopen("/tmp/file.gz", "r");
?>

Veja também gzclose().

gzpassthru

gzinflate

Last updated: Fri, 22 Aug 2008

add a note User Contributed Notes
gzopen

plasma
06-Sep-2008 11:06


This worked unstable for me under high load (50+ files per second):



<?php

    $gz = gzopen ( $file, 'w9' );

    gzwrite ( $gz, $content );

    gzclose ( $gz );

?>



The following works fine:



<?php

    $f = fopen ( $file, 'w' );

    fwrite ( $f, gzcompress ( $content, 9 ) );

    fclose ( $f );

?>

katzlbtjunk at hotmail dot com
24-Apr-2008 03:15


WARNING gzopen and gzread have a major disadvantage. They makes NO checksum and NO length verification of the gzipped data and discard this valuable information. This should be documented here.

rob at digital-crocus dot com
01-Jun-2005 08:28


dtorop932 at hotmail dot com's comments, according to my tests, is incorrect. That code wishes to download the entire file before parsing, which is inconvinient. The wget method works though.

pentek_imre at mailbox dot hu
30-Jan-2005 02:36


Be aware that when opening a remote file on a http server the gzopen will return by default false after 120 seconds waiting to any answer.

dtorop932 at hotmail dot com
22-Oct-2004 03:04


RE dubious's comment: "Being able to read gzip streams from ftp and http is near the top of my personal wishlist at the moment..."



One way to read a gzip stream over http is to daisychain stream wrappers, e.g.:



<?

$fp = fopen("compress.zlib://http://some.website.org/example.gz", "r");

?>

-delete-this-part-dubious at 2xtreme dot net
03-Jan-2002 11:22


"On the fly" gunzipping actually DOES seem to work - it just appears that only LOCAL streams/files (including php://stdin) can be accessed for some reason.  I THINK (but have not yet tested) that you could similarly gzopen "php://stdout" and pass a stream of gzipped data to the browser (when run from a web page) or console (when run standalone) through there.



I HAVE tested scripts from the command line like:



wget -q -O- ftp://some.host.net/pub/some_gzip_file.gz | php gunzip_stuff.php



where gunzip_stuff.php would be a script that gzopened "php://stdin" and did gzgets from that stream, and it seems to work fine, but that obviously doesn't help someone wanting to grab gzipped streams from remote sites from a web-based script.



Being able to read gzip streams from ftp and http is near the top of my personal wishlist at the moment...

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gzpassthru

gzinflate

Last updated: Fri, 22 Aug 2008