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Creating ZIP and TAR archives on the fly with PHP

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Fixing the relative paths

So we have to find a solution for that. The easiest solution is to simply copy all the files and directory to our temporary directory, so the relative paths still work. Copying a file is easy, since PHP comes with an inbuilt copy function logically called copy(). We have to add the following to our script:

// Copy files & directories so relative paths still work
foreach ($list as $item) {
if (is_file($item)) {
// Copy file
copy ($item, $dir . $item);
} elseif (is_dir ($item)) {
// TODO: we'll do this in a minute
} else {
// Invalid file, just ignore
continue;
}
}

If the above code is placed above the chdir() call, all the files will be included in the zip file, and work properly. But directories aren't yet included because we haven't copied those yet.

Unfortunately PHP doesn't come with a copy_directory() or something similar, and we have to write our own. A quick Google search will probably turn up something very quickly, but here's one I wrote myself:

function move_directory($source, $dest, $copy=false) {
// Standardize paths
$source = str_replace('\\\\', '/', $source);
$source = str_replace('\\', '/', $source);

$dest = str_replace('\\\\', '/', $dest);
$dest = str_replace('\\', '/', $dest);

// Remove trailing slashes
$source = rtrim($source, '/');
$dest = rtrim($dest, '/');

// Add trailing slashes
$source .= '/';
$dest .= '/';

// Source doesn't exist?
if (file_exists($source) == false) { return false; }

// Try to create destination
@mkdir($dest);

// Destination doesn't exist?
if (file_exists($dest) == false) { return false; }

// Copy all files
$d = dir($source);

while (false !== ($entry = $d->read())) {
if ($entry == '.' OR $entry == '..') continue;
$file = $d->path . $entry;

// Is a sub dir?
if (is_dir($file)) {
// Try to create sub dir
$subdir = $dest . $entry . '/';
$result = @mkdir($subdir);
if ($result == false) { continue; }

// Move files in sub directory
move_directory($file, $subdir, $copy);
continue;
}

// Copy file
copy($file, $dest . $entry);

// Remove old file?
if ($copy == false) {
// Moving the directory, so remove original
@unlink($file);
}
}

if ($copy == false) {
@rmdir($source);
}

return true;
}

I won't really bother explaining the function, but it basically copies all the files in the directory, and all the sub-directories (and does the same for all the sub-directories, and so forth).

If we incorporate this function into our script, the part that copies the files and directories now looks like this:

// Copy files & directories so relative paths still work
foreach ($list as $item) {
if (is_file($item)) {
// Copy file
copy ($item, $dir . $item);
} elseif (is_dir ($item)) {
// Copy directory
move_directory ($item, $dir . $item, true);
} else {
// Invalid file, just ignore
continue;
}
}

And if we put everything together our script looks like this:

include ('pear/archive_zip.php');

// Create instance of Archive_Zip class, and pass the name of our zipfile
$zipfile = New Archive_Zip('myzipfile.zip');

// Create a list of files and directories
$list = array('example.txt', 'test');

// Get temporary directory
if (!empty($_ENV['TMP'])) {
$tempdir = $_ENV['TMP'];
} elseif (!empty($_ENV['TMPDIR'])) {
$tempdir = $_ENV['TMPDIR'];
} elseif (!empty($_ENV['TEMP'])) {
$tempdir = $_ENV['TEMP'];
} else {
$tempdir = dirname(tempnam('', 'na'));
}

if (empty($tempdir)) { die ('No temporary directory'); }

// Make sure trailing slash is there
$tempdir = rtrim($tempdir, '/');
$tempdir .= '/';

// Make sure temporary directory is writable
if (is_writable($tempdir) == false) {
die ('Temporary directory isn\'t writable');
}

// Create temp name for our own directory
$dir = tempnam($tempdir, 'temp');

// Make sure another file or directory doesn't already exist with this name
@unlink($dir);
@rmdir($dir);

// Create directory
mkdir($dir);
$dir .= '/';

// Change current working directory, so that the zip file gets created in the temp dir
chdir($dir);

// Create the zip file
$zipfile->create($list);

echo 'Zip file created in ' . $dir;