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libraries/joomla/google/embed/analytics.php
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332
libraries/joomla/google/embed/analytics.php
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<?php
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/**
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* @package Joomla.Platform
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* @subpackage Google
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*
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* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved
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* @license GNU General Public License version 2 or later; see LICENSE
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*/
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defined('JPATH_PLATFORM') or die;
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/**
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* Google Analytics embed class for the Joomla Platform.
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*
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* @package Joomla.Platform
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* @subpackage Google
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* @since 12.3
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*/
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class JGoogleEmbedAnalytics extends JGoogleEmbed
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{
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/**
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* Method to get the tracking code
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*
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* @return string The Google Analytics tracking code
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*
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* @since 12.3
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*/
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public function getCode()
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{
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return $this->getOption('code');
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}
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/**
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* Method to set the tracking code
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*
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* @param string $code The Google Analytics tracking code
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*
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* @return JGoogleEmbedAnalytics The object for method chaining
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*
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* @since 12.3
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*/
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public function setCode($code)
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{
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$this->setOption('code', $code);
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return $this;
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}
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/**
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* Checks if the javascript is set to be asynchronous
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*
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* @return boolean True if asynchronous
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*
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* @since 12.3
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*/
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public function isAsync()
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{
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return $this->getOption('async') === null ? true : $this->getOption('async');
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}
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/**
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* Load javascript asynchronously
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*
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* @return JGoogleEmbedAnalytics The object for method chaining
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*
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* @since 12.3
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*/
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public function useAsync()
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{
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$this->setOption('async', true);
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return $this;
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}
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/**
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* Load javascript synchronously
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*
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* @return JGoogleEmbedAnalytics The object for method chaining
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*
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* @since 12.3
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*/
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public function useSync()
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{
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$this->setOption('async', false);
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return $this;
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}
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/**
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* Add an analytics call
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*
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* @param string $method The name of the function
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* @param array $params The parameters for the call
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*
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* @return array The added call
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*
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* @since 12.3
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*/
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public function addCall($method, $params = array())
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{
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$call = array('name' => $method, 'params' => $params);
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$calls = $this->listCalls();
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$calls[] = $call;
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$this->setOption('calls', $calls);
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return $call;
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}
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/**
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* List the analytics calls to be executed
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*
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* @return array A list of calls
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*
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* @since 12.3
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*/
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public function listCalls()
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{
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return $this->getOption('calls') ? $this->getOption('calls') : array();
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}
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/**
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* Delete a call from the stack
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*
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* @param int $index Index of call to delete (defaults to last added call)
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*
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* @return array The deleted call
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*
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* @since 12.3
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*/
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public function deleteCall($index = null)
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{
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$calls = $this->listCalls();
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if ($index === null)
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{
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$index = count($calls) - 1;
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}
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$call = $calls[$index];
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unset($calls[$index]);
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$calls = array_values($calls);
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$this->setOption('calls', $calls);
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return $call;
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}
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/**
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* Create a javascript function from the call parameters
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*
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* @param string $method The name of the function
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* @param array $params The parameters for the call
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*
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* @return string The created call
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*
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* @since 12.3
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*/
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public function createCall($method, $params = array())
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{
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$params = array_values($params);
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if ($this->isAsync())
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{
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$output = "_gaq.push(['{$method}',";
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$output .= substr(json_encode($params), 1, -1);
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$output .= ']);';
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}
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else
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{
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$output = "pageTracker.{$method}(";
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$output .= substr(json_encode($params), 1, -1);
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$output .= ');';
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}
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return $output;
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}
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/**
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* Add a custom variable to the analytics
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*
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* @param int $slot The slot to store the variable in (1-5)
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* @param string $name The variable name
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* @param string $value The variable value
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* @param int $scope The scope of the variable (1: visitor level, 2: session level, 3: page level)
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*
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* @return array The added call
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*
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* @since 12.3
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*/
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public function addCustomVar($slot, $name, $value, $scope = 3)
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{
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return $this->addCall('_setCustomVar', array($slot, $name, $value, $scope));
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}
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/**
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* Get the code to create a custom analytics variable
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*
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* @param int $slot The slot to store the variable in (1-5)
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* @param string $name The variable name
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* @param string $value The variable value
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* @param int $scope The scope of the variable (1: visitor level, 2: session level, 3: page level)
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*
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* @return string The created call
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*
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* @since 12.3
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*/
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public function createCustomVar($slot, $name, $value, $scope = 3)
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{
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return $this->createCall('_setCustomVar', array($slot, $name, $value, $scope));
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}
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/**
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* Track an analytics event
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*
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* @param string $category The general event category
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* @param string $action The event action
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* @param string $label The event description
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* @param string $value The value of the event
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* @param boolean $noninteract Don't allow this event to impact bounce statistics
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*
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* @return array The added call
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*
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* @since 12.3
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*/
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public function addEvent($category, $action, $label = null, $value = null, $noninteract = false)
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{
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return $this->addCall('_trackEvent', array($category, $action, $label, $value, $noninteract));
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}
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/**
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* Get the code to track an analytics event
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*
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* @param string $category The general event category
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* @param string $action The event action
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* @param string $label The event description
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* @param string $value The value of the event
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* @param boolean $noninteract Don't allow this event to impact bounce statistics
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*
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* @return string The created call
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*
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* @since 12.3
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*/
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public function createEvent($category, $action, $label = null, $value = null, $noninteract = false)
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{
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return $this->createCall('_trackEvent', array($category, $action, $label, $value, $noninteract));
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}
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/**
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* Get code to load Google Analytics javascript
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*
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* @return string Javascript code
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*
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* @since 12.3
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*/
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public function getHeader()
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{
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if (!$this->isAsync())
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{
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// Synchronous code is included only in the body
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return '';
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}
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if (!$this->getOption('code'))
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{
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throw new UnexpectedValueException('A Google Analytics tracking code is required.');
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}
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$code = $this->getOption('code');
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$output = '<script type="text/javascript">';
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$output .= 'var _gaq = _gaq || [];';
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$output .= "_gaq.push(['_setAccount', '{$code}']);";
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foreach ($this->listCalls() as $call)
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{
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$output .= $this->createCall($call['name'], $call['params']);
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}
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$output .= '_gaq.push(["_trackPageview"]);';
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$output .= '</script>';
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return $output;
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}
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/**
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* Google Analytics only needs to be included in the header
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*
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* @return null
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*
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* @since 12.3
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*/
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public function getBody()
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{
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if (!$this->getOption('code'))
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{
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throw new UnexpectedValueException('A Google Analytics tracking code is required.');
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}
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$prefix = $this->isSecure() ? 'https://ssl' : 'http://www';
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$code = $this->getOption('code');
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if ($this->isAsync())
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{
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$output = '<script type="text/javascript">';
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$output .= '(function() {';
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$output .= 'var ga = document.createElement("script"); ga.type = "text/javascript"; ga.async = true;';
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$output .= "ga.src = '{$prefix}.google-analytics.com/ga.js';";
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$output .= 'var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(ga, s);';
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$output .= '})();';
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$output .= '</script>';
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}
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else
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{
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$output = '<script type="text/javascript">';
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$output .= "document.write(unescape(\"%3Cscript src='{$prefix}.google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E\"));";
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$output .= '</script>';
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$output .= '<script type="text/javascript">';
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$output .= 'try{';
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$output .= "var pageTracker = _gat._getTracker('{$code}');";
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foreach ($this->listCalls() as $call)
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{
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$output .= $this->createCall($call['name'], $call['params']);
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}
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$output .= 'pageTracker._trackPageview();';
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$output .= '} catch(err) {}</script>';
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}
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return $output;
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}
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}
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