Codeigniter: IF(condition){ insert table1 } ELSE { insert into another table}

Is it possible??

if(selectboxValue == Trending_blog)
{
    insert into trendingTable;
} else {
    insert into anotherTable;
}

I want to do it in codeigniter. If the selct box selected value is trending, then i want to insert that blog in trendingTable, else if the value is something else then i want to insert it in anotherTable.