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This is a Lambda function also called anonymous function within a regular function that scans a given directory and it’s sub directories returning an array of all php files within.

Following is a snip output of the Zend files.

[6] => /usr/share/php/Zend/Captcha/ReCaptcha.php
[7] => /usr/share/php/Zend/Captcha/Base.php
[8] => /usr/share/php/Zend/Feed/Rss.php
[9] => /usr/share/php/Zend/Feed/Atom.php
[52] => /usr/share/php/Zend/Feed/Writer/Source.php
[53] => /usr/share/php/Zend/Feed/Pubsubhubbub.php
[54] => /usr/share/php/Zend/Feed/Element.php
[55] => /usr/share/php/Zend/Feed/Reader/Feed/Rss.php
[90] => /usr/share/php/Zend/Feed/Builder.php
[91] => /usr/share/php/Zend/Feed/Writer.php
[92] => /usr/share/php/Zend/Config.php
[93] => /usr/share/php/Zend/Json/Server.php
[94] => /usr/share/php/Zend/Json/Exception.php
[95] => /usr/share/php/Zend/Json/Encoder.php
[865] => /usr/share/php/Zend/View/Stream.php
[866] => /usr/share/php/Zend/View/Interface.php
[867] => /usr/share/php/Zend/View/Abstract.php
[868] => /usr/share/php/Zend/Search/Exception.php
[869] => /usr/share/php/Zend/Search/Lucene.php

<?php

/**
 *
 * @param string $dir
 * @return array 
 */
function get_php_files_in_dir($dir)
{
	$bin = array ();
	$run = function(&$run, $dir, &$bin) {
		if ($handle = opendir($dir)) {
			while (false !== ($file = readdir($handle))) {
				if ($file != "." && $file != "..") {
					if (strpos($file, '.php') > 0) {
						$bin[] = $dir . '/' . $file;
					} elseif (is_dir($dir . '/' . $file)) {
						$run($run, $dir . '/' . $file, $bin);
					}
				}
			}
		}
		closedir($handle);
	};
	$run($run, $dir, $bin);
	return $bin;
}
?>

gist id=3107221