Edit script

[Revan Yo]

Hello, Im making an OTS and I thought about new weapon category (like axe, sword etc...)Anyway I found a poison arrow script, and i think if someone could telle me what do what, I can find out how to change it (Im a PHP programmer )
Heres the script:

local combat = createCombatObject()
setCombatParam(combat, COMBAT_PARAM_BLOCKARMOR, 1)
setCombatParam(combat, COMBAT_PARAM_TYPE, COMBAT_POISONDAMAGE)
setCombatParam(combat, COMBAT_PARAM_DISTANCEEFFECT, CONST_ANI_POISONARROW)
setCombatFormula(combat, COMBAT_FORMULA_SKILL, 1, 0, 1, 0)

local condition = createConditionObject(CONDITION_POISON)
setConditionParam(condition, CONDITION_PARAM_DELAYED, 1)
addDamageCondition(condition, 10, 2000, -1)
setCombatCondition(combat, condition)

function onUseWeapon(cid, var)
	return doCombat(cid, combat, var)
end

Hope u can help me guys!