[RESOLVED] problem with comparing array values

[deregular]

Hope you guys can help.
Im trying to build a badwords function, whereby I have my list of bad words in a txt file. I want to run through a keyword array, and check to see if any of the bad words in the text file are inside any of the array contents.
My problem is that the keywords in my array are not single words they can contain multiple words.

Easier to show an example.

If the keyword is "monkey sex" and "sex" is in my list of bad words, I want to unset the word "monkey sex" from my array.

So far I have come up with this below, however it throws out 'Undefined Index' errors.

Any ideas??

function grabandcleankeywords($keyword){

  $tempArr=file('data/naughty.txt');
    foreach($tempArr as $word){
      $word=trim($word);
      $nasty[]=$word;
    }

$set = mysql_query("select distinct keyword from keywords where keyword like '%$keyword%'");
 while ($row = mysql_fetch_row($set)){
    $keywords[]=$row[0];
 }

$nastyCount = count($nasty);
$keywordCount=count($keywords);

for ($k=0; $k<$keywordCount; $k++){
    for ($l=0; $l<$nastyCount; $l++){
    if (stristr($keywords[$k], $nasty[$l])){ //throws Undefined index error here
       unset($keywords[$k]);
      }
  }
}
return $keywords;
}

[NogDog]

My guess is that once you unset() a value from the array, you then hit the error when you try to loop through it again and your loop index hits that unset index number. Instead of the for loop, try a foreach loop:

foreach($keywords as $k => $keyword) {
   if(stristr($keyword, $nasty[$l])) {
      unset($keywords[$k]);
   }
}

[deregular]

absolutely brilliant. Thanks NogDog worked a charm.

Weird I did try it this way yesterday, but I guess I was pulling my hair out.

I was doing

foreach($keywords as $k) {

rather than the way you did it..

foreach($keywords as $k => $keyword) {

Just for future reference, what is the difference between these two?

[laserlight]

Not much, except that the latter (NogDog's example) allows you to use the key, and thus you can affect the element in the array itself ($keywords[$k]) rather than just the temporary $keyword on each iteration.

[deregular]

Got it. Thanks laserlight.

Im always learning !...