php - find and copy files to another directory

<?php

function blobR($pattern, $flags){
	$files = glob($pattern, $flags);
	foreach (glob(dirname($pattern).'/*', GLOB_ONLYDIR|GLOB_NOSORT) as $dir){
		$files = array_merge($files, blobR($dir.'/'.basename($pattern), $flags));
	}
	return $files;
}

function copyfiles($pattern, $des_dir, $flags = 0){
	createdir($des_dir);
	$arr = blobR($pattern, $flags);
	foreach ($arr as $key => $value) {
		$file = getfilename($value);
		copy($value, $des_dir . '/' . $file);
	}
}

function getfilename($filename){
	$file = substr($filename, strrpos($filename, '/') + 1);
	return $file;
}

function createdir($des_dir){
	if (!file_exists($des_dir)) {
    	mkdir($des_dir, 0777, true);
	}
}

copyfiles('*.epub', 'allbooks');


?>