Organising classes - Best practice?

[andreana]

A quick question about best practice with PHP classes. I have seen people use filenames such as \[code\]something.class.php\[/code\] to organise their classes in external files.So, is it best practice to have one file per class, or multiple classes per file.At the moment, I am scripting an RPG and have a single \[code\]class_lib.php\[/code\] file. I currently have just character-related classes in there, and before I go any further would like to know if it's more suitable to keep classes grouped in files, have all classes in a single file, or keep each class to its own file.What are the advantages/disadvantages of each approach?Made this CW as it may not have a definite answer