Can I add function in HItems.php in OSClass

Can I add function in HItems.php in OSClass

References

Reference NO 1

http://doc.osclass.org/Helpers

Reference NO 2

http://forums.osclass.org/general-help/how-to-add-category-tag-next-to-item-title/5/?wap2

Reference NO 3

http://forums.osclass.org/development/a-little-help-with-php!/

Reference NO 4

http://forums.osclass.org/development/function-ltphp-echo-osc_total_active_items()-gt/

Reference NO 5

http://phpdoc.osclass.org/elementindex_OSClass.html

Reference NO 6

#EANF#

Reference NO 7

#EANF#

Reference NO 8

#EANF#