Programming :: Multi File Recursive Folder Search And Replace?

I'm wanting to mod some PHP files across a hierarchy and thought I'd drive it with find + grep + xargs

I built up a command line which I was confident would do the job, but now can't save the results.

First I tried this:

Code:
find . -name *.php | xargs grep serialize | cut -d: -f1| sort -u | xargs sed -i s/serialize/serialise/g
but that didn't work:
Code:
sed: illegal option -- i
so I thought I'd try using
Code:

[Code].....