Enable Class loading with Namespaces in CodeIgniter

config.php

/*
 * Append this to the end of your application/config.php
 * @see http://stackoverflow.com/questions/3700626/namespace-in-php-codeigniter-framework#21858556
 */
 
spl_autoload_extensions('.php'); // Only Autoload PHP Files

spl_autoload_register(function($classname) {

    if (strpos($classname, '\\') !== false) {
        // Namespaced Classes
        $classfile = (str_replace('\\', '/', $classname));

        if ($classname[0] !== '/') {
            $classfile = APPPATH . 'libraries/' . $classfile . '.php';
        }
        require($classfile);
    } else if (strpos($classname, 'interface') !== false) {
        // Interfaces
        strtolower($classname);
        require('application/interfaces/' . $classname . '.php');
    }
});

I'd like to note that you can always register your namespaces and load them via composer. CodeIgniter in version 3.x specifically allows this via configuration.

Hi,
Is this effect all my .php which I do not wish to add as a namespace or only namespaced one file will affect?

Worked for me. Thanks!