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Getting Joomla! module, template & plugin parameters
Plugin parameters from inside a plugin
$param = $this->params->get('paramName', defaultValue);
Plugin parameters from outside a plugin
$plugin = JPluginHelper::getPlugin('editors', 'codemirror');
$pluginParams = new JRegistry();
$pluginParams->loadString($plugin->params);
$param = $pluginParams->get('paramName', 'defaultValue');
Module parameters from inside a module
$param = $params->get('paramName', 'defaultValue');
Module parameters from outside a module
$module = JModuleHelper::getModule('banners');
$moduleParams = new JRegistry();
$moduleParams->loadString($module->params);
$param = $moduleParams->get('paramName', 'defaultValue');
Component parameters from inside a component
$app = JFactory::getApplication('site');
$componentParams = $app->getParams('com_content');
$param = $componentParams->get('paramName', defaultValue);
Component parameters from outside a component
$app = JFactory::getApplication('site');
$componentParams = $app->getParams('com_example');
$param = $componentParams->get('paramName', defaultValue);
Template parameters from inside a template
$param = $this->params->get('paramName', defaultValue);
Template parameters from outside a template
$app = JFactory::getApplication('site');
$template = $app->getTemplate(true);
$param = $template->params->get('paramName', defaultValue);