[HELP!] Quick PHP question... please take a look someone

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I am trying to make an if/else statement that deals with the last reply time of threads. I had this working a few hours ago but I've since had to restart by PC when it froze and now I can't figure out what I did to begin with

Here's my basic idea of what I am trying to do:

PHP Code:

if ((time()-$thread['lastpost']) >= 86400 and !$bbuserinfo['userid']) 
    {$variable=1;}
else if ($bbuserid != 0)
    {$variable=2;}

if ((time()-$thread['lastpost']) >= 86400) 
{
$variable=1;
} 
elseif (!$bbuserinfo['userid'])  
{
$variable=2;
} 
elseif ($bbuserinfo['userid'] != 0) 
{
$variable=3;
} 
else 
{$variable=4;
} 


Is there something I don't understand about if/else statements??? This is basically what I am trying to do but i haven't been able to get this to work.

Is there a good place that shows the do's and don'ts of if/else statements???? Or can someone show me what I am doing wrong?

Thanks!