format base strip sscanf php

function stripCurrency($input) {

$input = str_replace(",","",$input);
$input = str_replace("$","",$input);

return $input;
}

function stripRoadTax($input) {

$input = str_replace(",","",$input);
$input = str_replace("$","",$input);
list($val) = sscanf($input, "%d per year");

return $val;
}

function stripMileage($input) {

$input = str_replace(",","",$input);
list($val) = sscanf($input, "%d km");

return $val;
}