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PHP compression and archiving - Zlib

伊谢尔伦Original: 2016-11-22 09:40:381304browse

Most file system functions use gzip to compress files. This module can help transparently read gzip compressed files.

Zlib support is not enabled by default in PHP. Use --with-zlib[=DIR] when you need to install and configure PHP.

The following example opens a temporary file to write a test string, and then prints the file content twice.

Example #1 Simple Zlib example

<?php
    $filename = tempnam(&#39;/tmp&#39;, &#39;zlibtest&#39;) . &#39;.gz&#39;;
    echo "<html>\n<head></head>\n<body>\n<pre class="brush:php;toolbar:false">\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 "

\n\n\n"; ?>

Related functions:

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 EOF 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 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_decode — Uncompress any raw/gzip/zlib encoded data

zlib_encode — Compress data with the specified encoding

zlib_get_coding_type — Returns the coding type used for output compression

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