Compare Wordpress Tags with Post Content and output

OK Wordpress PHP gods, here is a good one. I want to compare the TAGS against the Post Content, if the TAG appears in the Post Content, then I want it to output. If it doesn't appear in the content, then don't.

1. I am presuming that I would need to output开发者_JAVA百科 the TAGS as an Array

2. If I do the same for the Content, using (correct if incorrect) 'Explode' then each word would be single. Consider 'The Lazy Brown Fox', if I had a TAG 'Brown Fox'

So in short I am stumpped, and have no idea how to proceed. I am VERY sure that this post would interest many people.

Many thanks for your advice in advance

Stu

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Rather than exploding the words in the post, why not use strpos()? This would take care of the multiple word tags.

$tags = get_the_tags($post->ID);
$stripped = strtolower(strip_tags($post->post_content));
$tags_to_output = array();
foreach($tags as $tag){
    if (strpos($stripped, strtolower($tag->name)) !== false){
        $tags_to_output[] = $tag;
    }
}

If you were really worried about it you could replace multiple whitespace characters in $stripped