replace blank lines in php

Question

How do I remove multiple blank lines from a string. I have looked at the examples on stackoverflow and have tried to change my code accordingly but I am not getting the rig

Answer 1

Using regular expressions works, but some people unfamiliar with regular expressions could get confused as to how you lay out your expression. Using the familiar trim command is simply a better choice in my opinion, but in the end I think trim would be faster because it doesn't need to evaluate the regular expression etc.