Detect repeat words in string

Hi E's, I have one string that sometimes have a repeat words, and I want to know how detect them, and put them in other variable.
In practice:
$string = "cabanas pesca . fotografias algarve tavira cabanas . cabanas tavira fotografias . ser portugues . moncarapacho algarve . vila moncarapacho fotos . vila moncarapacho . free photos . foto fotografia . paisagem urbana . paisagem ceu . paisagem montanha . paisagem rural . concurso fotos paisagem . fotografia digital . foto paisagem . fotografia paisagem .";

The goal is detect repeat words and put them in new variable:
$newvariable = "cabanas fotografias algarve moncarapacho fotos foto paisagem";

How I do that?

Regards, JC
LVL 4
Pedro ChagasWebmasterAsked:
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Roger BaklundCommented:
Why is not "tavira", "vila" and "fotografia" in the result?
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Pedro ChagasWebmasterAuthor Commented:
@cxr, I'm sorry, but when I see the string that words scape from my eyes!
Yes, tavira, vila and fotografia is for put in the result.
$newvariable = "cabanas fotografias algarve tavira moncarapacho vila fotos foto paisagem fotografia";

Regards, JC
0
Roger BaklundCommented:
Then try this:
$string = "cabanas pesca . fotografias algarve tavira cabanas . cabanas tavira fotografias . ser portugues . moncarapacho algarve . vila moncarapacho fotos . vila moncarapacho . free photos . foto fotografia . paisagem urbana . paisagem ceu . paisagem montanha . paisagem rural . concurso fotos paisagem . fotografia digital . foto paisagem . fotografia paisagem .";
 
$words = explode(' ',$string);
$counts = array_count_values($words);
$multiple = array_filter($counts,create_function('$item','return $item>1;'));
unset($multiple['.']);
$newvariable = implode(' ',array_keys($multiple));
echo $newvariable

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