no curly braces ;(

[mauricioarango]

Hi everybody,
I'm a PHP beginner, so please forgive me for this question.

I am working on code someone else wrote a long time ago. The code was written without curly braces in many places, which for the most has been ok. However I am getting an error message that -for the code snippet I posted below- would read like this:
Notice: Undefined variable: f in ... on line 3.
Precisely a section that has a couple of loops and conditionals without braces. I am wondering if adding them will solve things. My problem is that I am very uncertain about where to add those braces since I don't know how many statements are within an IF or FOR that is not using the braces.

Could someone help me/show me where they would go on these lines of code? I'd appreciate it a lot.
Thanks so much,

Mauricio

for($x = 0;$x < $index;$x++)
    if($arr[$x] == $this->clistarray[0][$i]) $f = 1;
if($f) continue;
$arr[$index++] = $this->clistarray[0][$i];
if($articleadded == 0) 
    {
        $articleadded = 1;
        $this->enter_article($today);
    }    
printf("<br><b>Article has keyword </b> %s corresponding to country_id %d",$this->clistarray[1][$i],$this->clistarray[0][$i]);
$t = $this->clistarray[0][$i];
$insvpmainquery = "INSERT INTO `vpmain` ( `vpmain_id` , `article_id` , `country_id` ) VALUES ('', '$this->articleid', '$t')";
mysql_query($insvpmainquery);
 

[Markus]

for($x = 0;$x < $index;$x++)
    if($arr[$x] == $this->clistarray[0][$i]) $f = 1;
if($f) continue;
$arr[$index++] = $this->clistarray[0][$i];
if($articleadded == 0) 
    {
        $articleadded = 1;
        $this->enter_article($today);
    }    
printf("<br><b>Article has keyword </b> %s corresponding to country_id %d",$this->clistarray[1][$i],$this->clistarray[0][$i]);
$t = $this->clistarray[0][$i];
$insvpmainquery = "INSERT INTO `vpmain` ( `vpmain_id` , `article_id` , `country_id` ) VALUES ('', '$this->articleid', '$t')";
mysql_query($insvpmainquery);
 

Here's my shot:

for($x = 0;$x < $index;$x++)
{
    if($arr[$x] == $this->clistarray[0][$i]) 
    {
        $f = 1;
    }
    if($f)
    {
        continue;
    }
    $arr[$index++] = $this->clistarray[0][$i];
    if($articleadded == 0) 
    {
        $articleadded = 1;
        $this->enter_article($today);
    }    
printf("<br><b>Article has keyword </b> %s corresponding to country_id %d",$this->clistarray[1][$i],$this->clistarray[0][$i]);
$t = $this->clistarray[0][$i];
$insvpmainquery = "INSERT INTO `vpmain` ( `vpmain_id` , `article_id` , `country_id` ) VALUES ('', '$this->articleid', '$t')";
mysql_query($insvpmainquery);
 

[mauricioarango]

thanks so much for your suggestion.
I tried implementing it, but then I got another series of errors. This is part of a larger project, so there are many interconnected operations. Thus, any change here provokes something else elsewhere.
I am tempted to leave things as they are: The code I have is uncommented, and sometimes doesn't use the curly braces, so it is really hard to guess what's things are supposed to do and at times, it is hard to read.
Thanks for everything though.