How to save memory when reading a file in Php?

Question

I have a 200kb file, what I use in multiple pages, but on each page I need only 1-2 lines of that file so how I can read only these lines what I need if I know the line numb

Answer 1

Unless you know the offset of the line, you will need to read every line up to that point. You can just throw away the old lines (that you don't want) by looping through the file with something like fgets(). (EDIT: Rather than fgets(), I would suggest @Gordon's solution)

Possibly a better solution would be to use a database, as the database engine will do the grunt work of storing the strings and allow you to (very efficiently) get a certain "line" (It wouldn't be a line but a record with an numeric ID, however it amounts to the same thing) without having to read the records before it.