Something

if(is_string($tempTotal)) //455.28
	echo floatval(trim($tempTotal)); //0



//$tempTotal defined below
if (is_array($this->modules)) {
		reset($this->modules);
		while (list(, $value) = each($this->modules)) {
			$class = substr($value, 0, strrpos($value, '.'));
			if ($GLOBALS[$class]->enabled) {
				$size = sizeof($GLOBALS[$class]->output);
				for ($i=0; $i<$size; $i++) {
					
					if($GLOBALS[$class]->output[$i]['title'] == "Total:")
					{
						$tempTotal = str_replace("$", "", $GLOBALS[$class]->output[$i]['text']);
						continue;
					}
					else if(strstr($GLOBALS[$class]->output[$i]['title'],"Discount"))
						{ 
							$tempDiscount = str_replace("-$", "", $GLOBALS[$class]->output[$i]['text']);
						}
					
					$output_string .= '              <tr>' . "\n" .
						'                <td align="right" class="main">' . $GLOBALS[$class]->output[$i]['title'] . '</td>' . "\n" .
						'                <td align="right" class="main">' . $GLOBALS[$class]->output[$i]['text'] . '</td>' . "\n" .
						'              </tr>';
				}
			}
		}
	}