Search for list of words in a string

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I have a list of words and their definitions in a db table. Now I want to check to see if any of those words appear in a string, probably only a paragraph long.

What is the best way to search through the string for those words? I guess putting the words into an array and then checking if any one of those words are in the string. I just want to find the fastest method and the one that is the least cpu intensive.

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That propably depends on how many words you have in your paragraphs.

If you are going to do something like a thesaurus where people get the mouse over a word and see the meaning of the word, let me tell you the logic I used in a simmilar script. Of course this logic is suitable only if you have lots of words in your paragraphs, and in your db.

First I take the words in the paragraph, and split them by spaces. Then I create a query that search only for those words. Then from the db result, I do something like this :

Code:

<?php
foreach ( $words as word => $meaning )
{
   $paragraph = str_replace ( $word, $meaning, $paragraph );
}
?>

Hope this will help

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