Extended glob() to support double star ** (globstar) wildcard.

globstar.php

<?php

function globstar($pattern, $flags = 0) {
	if (stripos($pattern, '**') === false) {
		$files = glob($pattern, $flags);
	}
	else {
		$position = stripos($pattern, '**');
		$rootPattern = substr($pattern, 0, $position - 1);
		$restPattern = substr($pattern, $position + 2);
		$patterns = array($rootPattern.$restPattern);
		$rootPattern .= '/*';
		while($dirs = glob($rootPattern, GLOB_ONLYDIR)) {
			$rootPattern .= '/*';
			foreach($dirs as $dir) {
				$patterns[] = $dir . $restPattern;
			}
		}
		$files = array();
		foreach($patterns as $pat) {
			$files = array_merge($files, globstar($pat, $flags));
		}
	}
	$files = array_unique($files);
	sort($files);
	return $files;
}