src/Zend/Filter/Inflector.php
public function getPluginLoader()
    {
        if (!$this->_pluginLoader instanceof Zend_Loader_PluginLoader_Interface) {
            $this->_pluginLoader = new Zend_Loader_PluginLoader(array('Zend_Filter_' => 'Zend/Filter/'), __CLASS__);
        }

        return $this->_pluginLoader;
    }
public function getPluginLoader()
    {
        if (!$this->_pluginLoader instanceof Zend_Loader_PluginLoader_Interface) {
            $this->_pluginLoader = new Zend_Loader_PluginLoader(array('Zend_Filter_' => 'Zend/Filter/'), __CLASS__);
        }

        return $this->_pluginLoader;
    }
Retreive PluginLoader

@return Zend_Loader_PluginLoader_Interface