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$app = JFactory::getApplication();


// Detecting Active Variables
$option   = $app->input->getCmd('option', '');
$view     = $app->input->getCmd('view', '');
$layout   = $app->input->getCmd('layout', '');
$task     = $app->input->getCmd('task', '');
$itemid   = $app->input->getCmd('Itemid', '');

<?php
//Joomla 2.5
$jinput = JFactory::getApplication()->input;

$option = $jinput->getCmd('option', '');
$view = $jinput->getCmd('view', '');
$layout = $jinput->getCmd('layout', '');
$task = $jinput->getCmd('task', '');
$itemid = $jinput->getCmd('Itemid', '');