Notepad++

I have found this multi purpose editor to be very useful in editing .php and .html pages.

  notepad++ [1]

1) it "understands" a large variety of "languages"
2) it provides line numbers (multiple physical lines in the source file could be one line of php code)
3) it highlights  "begin" "end" tags for each style of "language"
4) it uses a green color to display all lines that are logically commented out in the "language"
  especially useful to discover errors when you attempt to comment out a range of lines in php 
  only to discover that you have escaped php and are in html 
  - which uses a different type of comment!
5) ability to search a folder and all sub-folders for a "text string". 
  You will get a "window" showing the file name and the line number and the text for each line