What RSS parser is there with content replacement?

Question

RSS

Prompt rss parser-aggregator in php! We need this functionality:

1. Collection from different rss sources
   
2. Issuance of a combined rss-feed
   
3. Content modification: filtering by words, replacing / deleting words according to the list, adding your own text before / after
   

If there are solutions in other languages ​​or as a free service, this is also an option.

Answer 1

muliti_curl()+regex and the required parser is ready! )