gzwrite

(PHP 4, PHP 5)

gzwrite — Ausgabe in gz-komprimierte Dateien

Beschreibung

int gzwrite ( resource $zp , string $string [, int $length ] )

gzwrite() schreibt den Inhalt von string in die angegebene gz-Datei aus.

Parameter-Liste

zp: Eine gz-Datei Resource. Diese muss gültig sein und auf eine Datei zeigen die erfolgreich mit gzopen() geöffnet wurde.
string: Der auszugebende String.
length: Die Anzahl unkomprimierter Bytes die ausgegeben werden soll. Wenn angegeben wird nach length geschriebenen Bytes aus string abgebrochen wenn bis dahin das Ende des Strings nicht erreicht ist.

Hinweis: Beachten Sie das der magic_quotes_runtime Konfigurationsparameter ignoriert wird und keine Slashes aus string entfernt werden wenn der optionale Parameter length übergeben wird.

Rückgabewerte

Gibt die Anzahl der (unkomprimierten) Bytes zurück die auf den gegebenen gz-Stream ausgegeben wurden.

Beispiele

Beispiel #1 gzwrite() Beispiel


<?php
$string = 'Zu komprimierende Daten';
$gz = gzopen('somefile.gz','w9');
gzwrite($gz, $string);
gzclose($gz);
?>

Siehe auch

gzread() - Liest aus einer gz-Datei
gzopen() - Öffnet gz-Dateien

readgzfile

gzuncompress

Last updated: Fri, 30 Oct 2009

add a note User Contributed Notes
gzwrite

calmarius at nospam dot atw dot hu
05-Feb-2009 04:07


gz compression is often used with tar archives. Building tar archives is quite easy. Here is a code snipplet which can be used for building tar archives before compressing them to tar.gz.



<?php



//\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

// Adds file header to the tar file, it is used before adding file content.

// f: file resource (provided by eg. fopen)

// phisfn: path to file

// archfn: path to file in archive, directory names must be followed by '/'

//\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

function TarAddHeader($f,$phisfn,$archfn)

{

    $info=stat($phisfn);

    $ouid=sprintf("%6s ", decoct($info[4]));

    $ogid=sprintf("%6s ", decoct($info[5]));

    $omode=sprintf("%6s ", decoct(fileperms($phisfn)));

    $omtime=sprintf("%11s", decoct(filemtime($phisfn)));

    if (@is_dir($phisfn))

    {

         $type="5";

         $osize=sprintf("%11s ", decoct(0));

    }

    else

    {

         $type='';

         $osize=sprintf("%11s ", decoct(filesize($phisfn)));

         clearstatcache();

    }

    $dmajor = '';

    $dminor = '';

    $gname = '';

    $linkname = '';

    $magic = '';

    $prefix = '';

    $uname = '';

    $version = '';

    $chunkbeforeCS=pack("a100a8a8a8a12A12",$archfn, $omode, $ouid, $ogid, $osize, $omtime);

    $chunkafterCS=pack("a1a100a6a2a32a32a8a8a155a12", $type, $linkname, $magic, $version, $uname, $gname, $dmajor, $dminor ,$prefix,'');



    $checksum = 0;

    for ($i=0; $i<148; $i++) $checksum+=ord(substr($chunkbeforeCS,$i,1));

    for ($i=148; $i<156; $i++) $checksum+=ord(' ');

    for ($i=156, $j=0; $i<512; $i++, $j++)    $checksum+=ord(substr($chunkafterCS,$j,1));



    fwrite($f,$chunkbeforeCS,148);

    $checksum=sprintf("%6s ",decoct($checksum));

    $bdchecksum=pack("a8", $checksum);

    fwrite($f,$bdchecksum,8);

    fwrite($f,$chunkafterCS,356);

    return true;

}

//\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/

// Writes file content to the tar file must be called after a TarAddHeader

// f:file resource provided by fopen

// phisfn: path to file

//\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/

function TarWriteContents($f,$phisfn)

{

    if (@is_dir($phisfn))

    {

        return;

    }

    else

    {

        $size=filesize($phisfn);

        $padding=$size % 512 ? 512-$size%512 : 0;

        $f2=fopen($phisfn,"rb");

        while (!feof($f2)) fwrite($f,fread($f2,1024*1024));

        $pstr=sprintf("a%d",$padding);

        fwrite($f,pack($pstr,''));

    }

}

//\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/

// Adds 1024 byte footer at the end of the tar file

// f: file resource

//\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/

function TarAddFooter($f)

{

    fwrite($f,pack('a1024',''));

}



?>

repository at lamaresh dot net
03-Feb-2009 06:37


This function add a line to a .gz compressed file





<?php


function AppendLineGz($file,$string) {


    if (file_exists($file)) {


        $lines = gzfile($file);


        $lines[count($lines)] = "$string\r\n";


        $input=implode($lines);


    } else {$input="$string\r\n";}


    $gz = gzopen($file,'w9');


    gzwrite($gz, $input);


    gzclose($gz);    


}


?>

Anonymous
27-Mar-2008 08:34


katzlbtjunk's method is certainly shorter, but it is unusable for anything except small files.  It would try to load the whole file into memory, then create an entire compressed copy, and only then write it to disk.  The other method given below will not exhaust memory like that.

katzlbtjunk at hotmail dot com
22-Feb-2008 07:24


How about this instead:

$s = file_get_contents('file.tar'); 

file_put_contents('file.tar.gz',gzencode($s,9));

Kioob
13-Aug-2003 11:30


This is a short example of use gzwrite function. 


<?php


function gzcompressfile($source,$level=false){


    $dest=$source.'.gz';


    $mode='wb'.$level;


    $error=false;


    if($fp_out=gzopen($dest,$mode)){


        if($fp_in=fopen($source,'rb')){


            while(!feof($fp_in))


                gzwrite($fp_out,fread($fp_in,1024*512));


            fclose($fp_in);


            }


          else $error=true;


        gzclose($fp_out);


        }


      else $error=true;


    if($error) return false;


      else return $dest;


    }


?>





the function gzcompressfile() compress a file 'data.csv' to 'data.csv.gz'. the function return false if error, and the new file name if it's ok.

add a note

readgzfile

gzuncompress

Last updated: Fri, 30 Oct 2009