Some advice on working with files

Hi. I need to open a file and be able to delete and modify contents of it. I have looked at the file functions but it seems like I am a little limited. For instance, what if I wanted to open a file pick out 3 or 4 line os text and replace them? How best to do this. Sure I could use egrep_replace() but in php I can't egrep an entire file. Unless There's someting I don't know about. If anyone has dealt with this kind of situation and has some advice I would love to hear it. Thanks Ken N http://cleveland.lug.net/~rocket/ The answer is simple if you grant that ironies are like submarines; dangerous only when submerged.