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函數參考
PHP Manual

Zlib Compression Functions

介紹

This module enables you to transparently read and write gzip (.gz) compressed files, through versions of most of the filesystem functions which work with gzip-compressed files (and uncompressed files, too, but not with sockets).

Note: Version 4.0.4 introduced a fopen-wrapper for .gz-files, so that you can use a special zlib: URL to access compressed files transparently using the normal f*() file access functions if you prefix the filename or path with zlib: when calling fopen(). This feature requires a C runtime library that provides the fopencookie() function. Up to now the GNU libc seems to be the only library that provides this feature.
In PHP 4.3.0, zlib: has been changed to compress.zlib:// to prevent ambiguities with filenames containing ':' characters. The fopencookie() function is not longer required. More information is available in the section about Compression Streams.

需求

This module uses the functions of » zlib by Jean-loup Gailly and Mark Adler. You have to use a zlib version >= 1.0.9 with this module.

安裝

Zlib support in PHP is not enabled by default. You will need to configure PHP --with-zlib[=DIR]

Windows 版本的 PHP 已內建此延伸的支援﹐所以你毋須再載入附加的延伸來使用這些功能。

Note: Built-in support for zlib on Windows is available with PHP 4.3.0.

執行時期組態

php.ini中的設定會影響這些函數的行為。

The zlib extension offers the option to transparently compress your pages on-the-fly, if the requesting browser supports this. Therefore there are three options in the configuration file php.ini.

Zlib Configuration Options
Name Default Changeable Changelog
zlib.output_compression "0" PHP_INI_ALL Available since PHP 4.0.5.
zlib.output_compression_level "-1" PHP_INI_ALL Available since PHP 4.3.0.
zlib.output_handler "" PHP_INI_ALL Available since PHP 4.3.0.
For further details and definitions of the PHP_INI_* constants, see the php.ini directives.

這裡為簡短的結構指令說明。

zlib.output_compression boolean/integer

Whether to transparently compress pages. If this option is set to "On" in php.ini or the Apache configuration, pages are compressed if the browser sends an "Accept-Encoding: gzip" or "deflate" header. "Content-Encoding: gzip" (respectively "deflate") and "Vary: Accept-Encoding" headers are added to the output. In runtime, it can be set only before sending any output.

This option also accepts integer values instead of boolean "On"/"Off", using this you can set the output buffer size (default is 4KB).

Note: output_handler must be empty if this is set 'On' ! Instead you must use zlib.output_handler.

zlib.output_compression_level integer

Compression level used for transparent output compression.

zlib.output_handler string

You cannot specify additional output handlers if zlib.output_compression is activated here. This setting does the same as output_handler but in a different order.

資源類型

This extension defines a file pointer resource returned by gzopen().

預先定義常數

以下的常數由此延伸定義，只在這個延伸被編譯成PHP或實行時期被動態載入時有效。

FORCE_GZIP (integer)
FORCE_DEFLATE (integer)

範例

This example opens a temporary file and writes a test string to it, then it prints out the content of this file twice.

Example#1 Small Zlib Example

<?php

$filename = tempnam('/tmp', 'zlibtest') . '.gz';
echo "<html>\n<head></head>\n<body>\n<pre>\n";
$s = "Only a test, test, test, test, test, test, test, test!\n";

// open file for writing with maximum compression
$zp = gzopen($filename, "w9");

// write string to file
gzwrite($zp, $s);

// close file
gzclose($zp);

// open file for reading
$zp = gzopen($filename, "r");

// read 3 char
echo gzread($zp, 3);

// output until end of the file and close it.
gzpassthru($zp);
gzclose($zp);

echo "\n";

// open file and print content (the 2nd time).
if (readgzfile($filename) != strlen($s)) {
        echo "Error with zlib functions!";
}
unlink($filename);
echo "</pre>\n</body>\n</html>\n";

?>

Table of Contents

  • gzclose — Close an open gz-file pointer
  • gzcompress — Compress a string
  • gzdecode — Decodes a gzip compressed string
  • gzdeflate — Deflate a string
  • gzencode — Create a gzip compressed string
  • gzeof — Test for end-of-file on a gz-file pointer
  • gzfile — Read entire gz-file into an array
  • gzgetc — Get character from gz-file pointer
  • gzgets — Get line from file pointer
  • gzgetss — Get line from gz-file pointer and strip HTML tags
  • gzinflate — Inflate a deflated string
  • gzopen — Open gz-file
  • gzpassthru — Output all remaining data on a gz-file pointer
  • gzputs — Alias of gzwrite
  • gzread — Binary-safe gz-file read
  • gzrewind — Rewind the position of a gz-file pointer
  • gzseek — Seek on a gz-file pointer
  • gztell — Tell gz-file pointer read/write position
  • gzuncompress — Uncompress a compressed string
  • gzwrite — Binary-safe gz-file write
  • readgzfile — Output a gz-file
  • zlib_get_coding_type — Returns the coding type used for output compression
函數參考
PHP Manual