function wpcloud_calc_used_space($user_id) {

	if (!file_exists(get_directory_from_id($user_id))) { return '0';}
	
	$used_MB = 0;
	$dir = ABSPATH . 'cloud/' . $user_id;
	
	if ($handle = opendir($dir)) {

    while (false !== ($entry = readdir($handle))) {
		
        if ($entry != "." && $entry != "..") {
			$file = $dir . '/' . $entry;
			$used_MB = $used_MB + wpcloud_format_size($file, true);			
        }
    }

    closedir($handle);
	return $used_MB;

	}
}
<?php
	
	$dir = get_directory_from_id(get_current_user_id());
	if (!directory_exist(get_current_user_id())) {
		echo 'Cloud space not activated yet.<br/><small>Please upload a file to generate your webspace...</small>';
	} else {
		if ($handle = opendir($dir)) {

		echo '<table style="width:100%">
			<table style="width:100%">
			<tr>
			  <th>File name</th>
			  <th>Size</th> 
			  <th>Last edit</th>
			  <th></th>
			</tr>';
		
		while (false !== ($entry = readdir($handle))) {
			
			if ($entry != "." && $entry != "..") {
				//Check file extension ==
				$temp = explode(".", $entry);
				$extension = end($temp);
				if (!in_array($extension, getAllowedExtensions())) {
					continue;
				}
				// ====
				
				$file = $dir . '/' . $entry;
				$file_url = get_site_url() . '/cloud/' . get_current_user_id() . '/' . $entry;