WARNING:
You are browsing the documentation for Symfony 2.5 which is not maintained anymore.
Consider upgrading your projects to Symfony 5.2.
The ClassLoader Component
The ClassLoader Component¶
The ClassLoader component provides tools to autoload your classes and cache their locations for performance.
Usage¶
Whenever you reference a class that has not been required or included yet, PHP uses the autoloading mechanism to delegate the loading of a file defining the class. Symfony provides three autoloaders, which are able to load your classes:
- The PSR-0 Class Loader: loads classes that follow the PSR-0 class naming standard;
- The PSR-4 Class Loader: loads classes that follow the PSR-4 class naming standard;
- MapClassLoader: loads classes using a static map from class name to file path.
Additionally, the Symfony ClassLoader component ships with a set of wrapper classes which can be used to add additional functionality on top of existing autoloaders:
Installation¶
You can install the component in 2 different ways:
- Install it via Composer (
symfony/class-loaderon Packagist); - Use the official Git repository (https://github.com/symfony/ClassLoader).
This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.