src/Zend/Filter/Inflector.php
public function setStaticRule($name, $value)
    {
        $name = $this->_normalizeSpec($name);
        $this->_rules[$name] = (string) $value;
        return $this;
    }
public function setStaticRule($name, $value)
    {
        $name = $this->_normalizeSpec($name);
        $this->_rules[$name] = (string) $value;
        return $this;
    }
Set a static rule for a spec.  This is a single string value

@param string $name
@param string $value
@return Zend_Filter_Inflector