# Examples

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";

    ?>

Example #2 Working with the incremental compression and decompression API

    <?php
    // Perform GZIP compression:
    $deflateContext = deflate_init(ZLIB_ENCODING_GZIP);
    $compressed = deflate_add($deflateContext, "Data to compress", ZLIB_NO_FLUSH);
    $compressed .= deflate_add($deflateContext, ", more data", ZLIB_NO_FLUSH);
    $compressed .= deflate_add($deflateContext, ", and even more data!", ZLIB_FINISH);

    // Perform GZIP decompression:
    $inflateContext = inflate_init(ZLIB_ENCODING_GZIP);
    $uncompressed = inflate_add($inflateContext, $compressed, ZLIB_NO_FLUSH);
    $uncompressed .= inflate_add($inflateContext, NULL, ZLIB_FINISH);
    echo $uncompressed;
    ?>

The above example will output:

    Data to compress, more data, and even more data!

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