Unknown error (8192): Function split() is deprecated  in /home/estetici/public_html/app/code/core/Mage/CatalogIndex/Model/Aggregation.php on line 154

#0 [internal function]: mageCoreErrorHandler(8192, 'Function split(...', '/home/estetici/...', 154, Array)
#1 /home/estetici/public_html/app/code/core/Mage/CatalogIndex/Model/Aggregation.php(154): split()
#2 /home/estetici/public_html/app/code/core/Mage/CatalogIndex/Model/Aggregation.php(86): Mage_CatalogIndex_Model_Aggregation->_processTags(Array)
#3 /home/estetici/public_html/app/code/core/Mage/Catalog/Model/Layer.php(294): Mage_CatalogIndex_Model_Aggregation->saveCacheData(Array, 'STORE_1_CAT_118...', Array)
#4 /home/estetici/public_html/app/code/core/Mage/Catalog/Model/Layer.php(220): Mage_Catalog_Model_Layer->_getSetIds()
#5 /home/estetici/public_html/app/code/core/Mage/Catalog/Block/Layer/View.php(90): Mage_Catalog_Model_Layer->getFilterableAttributes()
#6 /home/estetici/public_html/app/code/core/Mage/Catalog/Block/Layer/View.php(53): Mage_Catalog_Block_Layer_View->_getFilterableAttributes()
#7 /home/estetici/public_html/app/code/core/Mage/Core/Block/Abstract.php(199): Mage_Catalog_Block_Layer_View->_prepareLayout()
#8 /home/estetici/public_html/app/code/core/Mage/Core/Model/Layout.php(445): Mage_Core_Block_Abstract->setLayout(Object(Mage_Core_Model_Layout))
#9 /home/estetici/public_html/app/code/core/Mage/Core/Model/Layout.php(229): Mage_Core_Model_Layout->addBlock('Mage_Catalog_Bl...', 'catalog.leftnav')
#10 /home/estetici/public_html/app/code/core/Mage/Core/Model/Layout.php(195): Mage_Core_Model_Layout->_generateBlock(Object(Mage_Core_Model_Layout_Element), Object(Mage_Core_Model_Layout_Element))
#11 /home/estetici/public_html/app/code/core/Mage/Core/Model/Layout.php(200): Mage_Core_Model_Layout->generateBlocks(Object(Mage_Core_Model_Layout_Element))
#12 /home/estetici/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(303): Mage_Core_Model_Layout->generateBlocks()
#13 /home/estetici/public_html/app/code/core/Mage/Catalog/controllers/CategoryController.php(101): Mage_Core_Controller_Varien_Action->generateLayoutBlocks()
#14 /home/estetici/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(376): Mage_Catalog_CategoryController->viewAction()
#15 /home/estetici/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(248): Mage_Core_Controller_Varien_Action->dispatch('view')
#16 /home/estetici/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(158): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#17 /home/estetici/public_html/app/Mage.php(459): Mage_Core_Controller_Varien_Front->dispatch()
#18 /home/estetici/public_html/index.php(65): Mage::run()
#19 {main}