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I tried to Enter something in a legacy Extension and I got:

Warning: mysql_real_escape_string(): Access denied for user ''@'localhost' (using password: NO) 

Then I changed all instances to

Quote

mysqli_real_escape_string

And retried. At that point I got:

mysqli_real_escape_string() expects exactly 2 parameters, 1 given on line 235

Here is the function:

function Lookup_addLookup ($url, $name, $group)
{
    $dbw = wfGetDB(DB_MASTER);

    $groupOrder = Lookup_getGroupOrder($group);
    $dbw->query ("INSERT INTO ".Lookup_prefix()."lookups (lu_name, lu_url, lu_group, lu_order, lu_group_order) VALUES ('".mysqli_real_escape_string($name)."', '".mysqli_real_escape_string($url)."', '".mysqli_real_escape_string($group)."', 1, $groupOrder)");

    Lookup_reOrderGroups();
    return true;
}