This PHP library can read CHM (Microsoft Compiled HTML Help) files and extract their contents.
There's no external dependencies to use this library: the only requirement is PHP 5.3.3 or greater (PHP 7 and HHVM are supported too).
You can run your own tests against this library (see here for details). In the GitHub repo I included only one test file, but I tested locally all the CHM files I found in my PC (they are about 400), and everything worked like a charm:wink:.
require_once 'CHMLib.php'; // You don't need this if you use Composer
$chm = \CHMLib\CHM::fromFile('YourFile.chm');
foreach ($chm->getEntries(\CHMLib\Entry::TYPE_FILE) as $entry) {
echo "File: ", $entry->getPath(), "\n";
echo "Contents: ", $entry->getContents(), "\n\n";
}
<?php
use \CHMLib\CHM;
use \CHMLib\Entry;
// Specify the output directory
$outputDirectory = 'output';
// Specify the input CHM file
$inputCHMFile = 'YourFile.chm';
require_once 'CHMLib.php';
if (!is_dir($outputDirectory)) {
mkdir($outputDirectory, 0777, true);
}
$chm = CHM::fromFile($inputCHMFile);
foreach ($chm->getEntries(Entry::TYPE_FILE) as $entry) {
echo "Processing {$entry->getPath()}... ";
$entryPath = ltrim(str_replace('/', DIRECTORY_SEPARATOR, $entry->getPath()), DIRECTORY_SEPARATOR);
$parts = explode(DIRECTORY_SEPARATOR, $entryPath);
$subDirectory = count($parts) > 1 ? implode(DIRECTORY_SEPARATOR, array_splice($parts, 0, -1)) : '';
$filename = array_pop($parts);
$path = $outputDirectory;
if ($subDirectory !== '') {
$path .= DIRECTORY_SEPARATOR . $subDirectory;
if (!is_dir($path)) {
mkdir($path, 0777, true);
}
}
$path .= DIRECTORY_SEPARATOR . $filename;
file_put_contents($path, $entry->getContents());
echo "done.\n";
}
echo "\nAll done.\n";
require_once 'CHMLib.php'; // You don't need this if you use Composer
function printTree($tree, $level)
{
if ($tree !== null) {
foreach ($tree->getItems() as $child) {
echo str_repeat("\t", $level).print_r($child->getName(), 1)."\n";
printTree($child->getChildren(), $level + 1);
}
}
}
$chm = \CHMLib\CHM::fromFile('YourFile.chm');
$toc = $chm->getTOC(); // Parse the contents of the .hhc file
$index = $chm->getIndex(); // Parse the contents of the .hhk file
printTree($toc, 0);
Some CHM file may come splitted into multiple CHM files.
Let's assume that we have a main file (main.chm
) that contains a TOC that references two other CHM files (sub1.chm
and sub2.chm
).
This can easily be parsed with this code:
require_once 'CHMLib.php'; // You don't need this if you use Composer
$main = \CHMLib\CHM::fromFile('main.chm');
$map = new \CHMLib\Map();
$map->add('sub1.chm', \CHMLib\CHM::fromFile('sub1.chm'));
$map->add('sub2.chm', \CHMLib\CHM::fromFile('sub2.chm'));
$toc = $main->getTOC();
$toc->resolve($map);
// Now the TOC of the main CHM file contains references to the entries in the other two CHM files
printTree($toc, 0);
You can offer me a monthly coffee or a one-time coffee 😉