Capital letters in class name PHP

Question

I have two classes in my system. One is called file and second is File. On my localhost when i instantiate file i get file object, but my friend running the same script gets

Answer 1

Classnames in PHP are not case sensitive (that doesn't depend on the operating system)

class myclass {}

$x = new MYclaSS;

var_dump($x);

object(myclass)#1 (0) {
}

so as general advice: You shouldn't start and try to mix something there :)

Code like this should not work:

class ab {}

class AB {}

Fatal error: Cannot redeclare class AB in ... on line x