Class Nette\Utils\Finder makes browsing the directory structure really easy.

All examples assume the following class alias is defined:

use Nette\Utils\Finder;

How to find all *.txt files in $dir directory without recursing subdirectories?

foreach (Finder::findFiles('*.txt')->in($dir) as $key => $file) {
	echo $key; // $key is a string containing absolute filename with path
	echo $file; // $file is an instance of SplFileInfo
}

As a result, the finder returns instances of SplFileInfo.

If the directory does not exist, an UnexpectedValueException is thrown.

And what about searching for *.txt files in $dir including subdirectories? Instead of in(), use from():

foreach (Finder::findFiles('*.txt')->from($dir) as $file) {
	echo $file;
}

Search by more masks, even inside more directories within one iteration:

foreach (Finder::findFiles('*.txt', '*.php')
	->in($dir1, $dir2) as $file) {
	...
}

Parameters can also be arrays:

foreach (Finder::findFiles($masks)->in($dirs) as $file) {
	...
}

Searching for *.txt files containing a number in the name:

foreach (Finder::findFiles('*[0-9]*.txt')->from($dir) as $file) {
	...
}

Searching for *.txt files, except those containing 'X' in the name:

foreach (Finder::findFiles('*.txt')
	->exclude('*X*')->from($dir) as $file) {
	...
}

exclude() is specified just after findFiles(), thus it applies to filename.

Directories to omit can be specified using the exclude after from clause:

foreach (Finder::findFiles('*.php')
	->from($dir)->exclude('temp', '.git') as $file) {
	...
}

Here exclude() is after from(), thus it applies to the directory name.

And now something a bit more complicated: searching for *.txt files located in subdirectories starting with 'te', but not 'temp':

foreach (Finder::findFiles('te*/*.txt')
	->exclude('temp*/*')->from($dir) as $file) {
	...
}

Depth of search can be limited using the limitDepth() method.

In addition to files, it is possible to search for directories using Finder::findDirectories('subdir*'), or to search for files and directories: Finder::find('file.txt').

You can also filter results. For example by size. This way we will traverse the files of size between 100B and 200B:

foreach (Finder::findFiles('*.php')->size('>=', 100)->size('<=', 200)
	->from($dir) as $file) {
	...
}

Or files changed in the last two weeks:

foreach (Finder::findFiles('*.php')->date('>', '- 2 weeks')
	->from($dir) as $file) {
	...
}

Here we traverse PHP files with number of lines greater than 1000. As a filter we use a custom callback:

$finder = Finder::findFiles('*.php')->filter(function($file) {
	return count(file($file->getPathname())) > 1000;
})->from($dir);

Finder, find images larger than 50px × 50px:

foreach (Finder::findFiles('*')
	->dimensions('>50', '>50')->from($dir) as $file) {
	...
}

It's possible to use custom streams, for example Zend_Service_Amazon_S3:

$s3 = new Zend_Service_Amazon_S3($key, $secret);
$s3->registerStreamWrapper('s3');

foreach (Finder::findFiles('photos*')
	->size('<=', 1e6)->in('s3://bucket-name') as $file) {
	echo $file;
}

Handy, right? You will certainly find a use for Finder in your applications.