Zend_Filter_Inflector has a number of utility methods
for retrieving and setting the plugin loader, manipulating and
retrieving rules, and controlling if and when exceptions are thrown.
setPluginLoader()can be used when you have configured your own plugin loader and wish to use it with
getPluginLoader()retrieves the currently set one.
setThrowTargetExceptionsOn()can be used to control whether or not
filter()throws an exception when a given replacement identifier passed to it is not found in the target. By default, no exceptions are thrown.
isThrowTargetExceptionsOn()will tell you what the current value is.
getRules($spec = null)can be used to retrieve all registered rules for all variables, or just the rules for a single variable.
getRule($spec, $index)fetches a single rule for a given variable; this can be useful for fetching a specific filter rule for a variable that has a filter chain.
$indexmust be passed.
clearRules()will clear all currently registered rules.