Have you tried tirelessly with no avail to remove "index.php" from your CodeIgniter url? I have, and after searching for like forever through the net for the solution, here is what finally worked for me.

Getting errors such as "500 internal error", "<IfModule takes one argument, Container for directives based on existence of specified modules" ... read on to solve this problem.

One of the first programs that one usually writes when learning any programming language is "Hello World!". Most of the programming language have same methodology and are almost similar to each other. 
If you learn PHP you can easily understand C and vice versa and same with others, because they are related to each other. Below is the programming code for "Hello World!" in 10 different programming languages.