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($zp3);

// 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$compressedZLIB_NO_FLUSH);
$uncompressed .= inflate_add($inflateContextNULLZLIB_FINISH);
echo 
$uncompressed;
?>

The above example will output:

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