A utility to get path info:
for example, a request uri could be:
/product/list.php/category/1/sort/price/asc
in list.php you want to get the information includes:
catetory: id=1
sort: "price", "asc"

PathInfoHelper is help to make this easier.

#Usage:
before using this utility class, need to create an instance first:
$helper = new PathInfoHelper();

##Get target request host Return the accessable host from outside even behind a proxy

$helper->TargetHost

##Get request URI This is a shortcut for $_SERVER["REQUEST_URI"];

$helper->RequestURI

##Get current script file Get the requested php script filename even if it is hidden by rewrite rule.

$helper->ScriptFile

##Get all path parameter string

$helper->ParameterString

for the example above, the result will be "/category/1/sort/price/asc"

##Get all path parameter array same as ParameterString, but break them into an array

$helper->Parameters

##Get single parameter value if an parameter has only one value followed, get this single value.

$helper->getParameterValue($paramName)

for the example above, "/category/1"
$helper->getParameterValue("category") will returns "1"

##Get multi parameter value if an parameter has more than one value, you can use getParameterValues method

$helper->getParameterValues($paramName, $valueCount)

for the example above, "/sort/price/asc"
$helper->getParameterValues("sort", 2) will returns array("price", "asc")