Differences and efficiency between include () and fopen () functions

Differences and efficiency between include () and fopen () functions: include () & nbsp; and & nbsp; fopen () & nbsp; Functions & nbsp; difference and efficiency if I want to reference a file, is it highly efficient to use include () or use the functions & nbsp; fopen () include () and fopen ()?
Q: differences and efficiency between include () and fopen () functions

If I want to reference a file, is it highly efficient to use include () or fopen ()? what is the difference, for example:

Test. php file

$ AB = "sfsadfsadfd ....";
....
?>

High-end files, AB. php

Include (test. php); or fopen (test. php) // Can you call the $ AB variable!
?>
Currently, the mainstream CMS uses INCLUDE or FOPEN to call files!

There is another problem, I use include () to introduce the file, the volume of the variable has Chinese he will be garbled, but I in the header to set the UTF-8, this problem occurs during PHP5.2 testing, but not in the latest PHP version.
Include () garbled fopen ()? Function sharing: More