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><H1
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>VII. Compression functions</H1
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><P
>&#13;   This module uses the functions of <A
HREF="http://www.cdrom.com/pub/infozip/zlib/"
TARGET="_top"
>zlib</A
> by Jean-loup Gailly and Mark Adler to
   transparently read and write gzip (.gz) compressed files. You have
   to use a zlib version &#62;= 1.0.9 with this module.
  </P
><P
>&#13;   This module contains versions of most of the <A
HREF="ref.filesystem.html"
>filesystem</A
> functions which work
   with gzip-compressed files (and uncompressed files, too, but not
   with sockets).
  </P
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CLASS="sect1"
><A
NAME="zlib-example"
>Small code example</A
></H1
><P
>&#13;      Opens a temporary file and writes a test string to it, then it
      prints out the content of this file twice.
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>Example 1. Small Zlib example</B
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>  1&nbsp;
  2&nbsp;&#60;?php
  3&nbsp;  $filename = tempnam('/tmp', 'zlibtest').'.gz';
  4&nbsp;  print "&#60;html&#62;\n&#60;head&#62;&#60;/head&#62;\n&#60;body&#62;\n&#60;pre&#62;\n";
  5&nbsp;  $s = "Only a test, test, test, test, test, test, test, test!\n";
  6&nbsp;  // open file for writing with maximum compression
  7&nbsp;  $zp = gzopen($filename, "w9");
  8&nbsp;  // write string to file
  9&nbsp;  gzwrite($zp, $s);
 10&nbsp;  // close file
 11&nbsp;  gzclose($zp);
 12&nbsp;  // open file for reading
 13&nbsp;  $zp = gzopen($filename, "r");
 14&nbsp;  // read 3 char
 15&nbsp;  print gzread($zp, 3);
 16&nbsp;  // output until end of the file and close it.
 17&nbsp;  gzpassthru($zp);
 18&nbsp;  print "\n";
 19&nbsp;  // open file and print content (the 2nd time).
 20&nbsp;  if (readgzfile($filename) != strlen($s)) {
 21&nbsp;          echo "Error with zlib functions!";
 22&nbsp;  }
 23&nbsp;  unlink($filename);
 24&nbsp;  print "&#60;pre&#62;\n&#60;/h1&#62;&#60;/body&#62;\n&#60;/html&#62;\n";
 25&nbsp;?&#62;
 26&nbsp;</PRE
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><B
>Table of Contents</B
></DT
><DT
><A
HREF="function.gzclose.html"
>gzclose</A
> &#8212; close an open gz-file pointer</DT
><DT
><A
HREF="function.gzeof.html"
>gzeof</A
> &#8212; test for end-of-file on a gz-file pointer</DT
><DT
><A
HREF="function.gzfile.html"
>gzfile</A
> &#8212; read entire gz-file into an
    array</DT
><DT
><A
HREF="function.gzgetc.html"
>gzgetc</A
> &#8212; get character from gz-file pointer</DT
><DT
><A
HREF="function.gzgets.html"
>gzgets</A
> &#8212; get line from file pointer</DT
><DT
><A
HREF="function.gzgetss.html"
>gzgetss</A
> &#8212; get line from gz-file pointer and strip HTML tags</DT
><DT
><A
HREF="function.gzopen.html"
>gzopen</A
> &#8212; open gz-file</DT
><DT
><A
HREF="function.gzpassthru.html"
>gzpassthru</A
> &#8212; output all remaining data on a gz-file pointer</DT
><DT
><A
HREF="function.gzputs.html"
>gzputs</A
> &#8212; write to a gz-file pointer</DT
><DT
><A
HREF="function.gzread.html"
>gzread</A
> &#8212; Binary-safe gz-file read</DT
><DT
><A
HREF="function.gzrewind.html"
>gzrewind</A
> &#8212; rewind the position of a gz-file pointer</DT
><DT
><A
HREF="function.gzseek.html"
>gzseek</A
> &#8212; seek on a gz-file pointer</DT
><DT
><A
HREF="function.gztell.html"
>gztell</A
> &#8212; tell gz-file pointer read/write position</DT
><DT
><A
HREF="function.gzwrite.html"
>gzwrite</A
> &#8212; Binary-safe gz-file write</DT
><DT
><A
HREF="function.readgzfile.html"
>readgzfile</A
> &#8212; output a gz-file</DT
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