Function to return only the files in a directory, and optionally do this recursively.

getFilesInDirectoryAsArray.php

<?php
function recurseDirectory(&$arrItems, $directory, $recursive) {
    if ($handle = opendir($directory)) {
        while (false !== ($file = readdir($handle))) {
            if ($file != "." && $file != "..") {
                if(is_dir($directory.$file)) {
					if($recursive){
						recurseDirectory($arrItems, $directory.$file."/", $recursive);
					}
				}else{
					$arrItems[] = $directory . $file;
				}
            }
        }
        closedir($handle);
    }
    return $arrItems;
}
function getFilesInDirectoryAsArray($directory, $recursive) {
    $arrItems = array();
	if(substr($directory, strlen($directory)-1, 1) != "/"){
		$directory.="/";
	}
	recurseDirectory($arrItems, $directory, $recursive);
    return $arrItems;
}
?>

Use like this: var_dump(getFilesInDirectoryAsArray("/path/",true));

Added support to filter the files by one or more file extensions. Usage: var_dump(getFilesInDirectoryAsArray("/path/",true, array("js", "css")));