String manipulation out of the box solution?

Hi there, I am writing an internal full text search engine and do have trouble in outputting the text in an apropriate way. Problem is that if there is more than one word I cant handle the text cropping. For example: Search term: php germany Text from database: There is no such great language than php. Amongh those countries using this language is Germany with a good percentage of users. Text output should be: ...language than php. Amongh... language is Germay with a good... Similar to the way google does it. I tried it now with a couple of ways but failed for most (I tried with strpos and substr). Is there a solution out of the box with php, or maybe anybody knows a good script which does that. This does sound like a standard feature to me. Thank you for any help, Merlin