Basic naming idea in codeigniter

1. File Naming
   Class files must be named in a Ucfirst-like manner, while any other file name (configurations, views, generic scripts, etc.) should be in all lowercase.
   
   
   INCORRECT:
   somelibrary.php
   someLibrary.php
   SOMELIBRARY.php
   Some_Library.php
   
   
   Application_config.php
   Application_Config.php
   applicationConfig.php
   CORRECT:
   Somelibrary.php
   Some_library.php
   
   
   applicationconfig.php
   application_config.php
   Furthermore, class file names should match the name of the class itself. For example, if you have a class named Myclass, then its filename must be Myclass.php.
   
   

   Class and Method Naming

   Class names should always start with an uppercase letter. Multiple words should be separated with an underscore, and not CamelCased.
   INCORRECT:

   class superclass

   class SuperClass

   CORRECT:

   class Super_class

   class Super_class {

           public function __construct()

           {

           }

   }

   Class methods should be entirely lowercased and named to clearly indicate their function, preferably including a verb. Try to avoid overly long and verbose names. Multiple words should be separated with an underscore.
   INCORRECT:

   function fileproperties()               // not descriptive and needs underscore separator

   function fileProperties()               // not descriptive and uses CamelCase

   function getfileproperties()            // Better!  But still missing underscore separator

   function getFileProperties()            // uses CamelCase

   function get_the_file_properties_from_the_file()        // wordy

   CORRECT:

   function get_file_properties()  // descriptive, underscore separator, and all lowercase letters