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 object of File like the capital letters were unrecognized and “file” was equal to “File”. Is that some configurable thing? We are both running on Windows. I have WampServer, he has XAMPP.
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PHP is case insensitive for the class naming. it means you can normally do $file = new file() even if the class is named File and vice-versa.
Are you by any chance relying on the auto loading of class files ? If this is the case, it is possible that depending on the computer, the interpreter don’t always find the same file first. This will explain the problem.
I strongly suggest that you rename your classes. It’s always a bad idea to rely on case to differentiate two different things and by convention, class names always start with a capital letter.
If you can’t change the class names, I suggest to have a look at php namespaces.
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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:
class ab {}
class AB {}shoudn’t work alltogether and produce a:
Fatal error: Cannot redeclare class AB in … on line xerror.
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I guess you are using some kind of lazy loading for class files, amybe you are programming in a PHP framework. The secret will lie in your __autoload function. Find it.
Check PHP manual for Autoloading.
The following code:
class file {
public $a;
}
class File {
public $a2;
}
$x = new file();Gives an error: Cannot redeclare class File so again, the trick might be which file is included.
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Windows file system is NOT case-sensitive. Which means the files in include path “must” have different names if you have any kind of class loader, even if you are including directly. So you would better start renaming.