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Prior to PSR-4, PHP components and frameworks used the magic method _autoload() or spl_autoload_register() to implement their own autoloaders, so we learned to use each component and framework's unique autoloader, and Nowadays, everyone follows PSR-4, which means we can mix and match multiple PHP components with just one autoloader.
The PHP framework works with an automatic loading mechanism. Autoloading is the process by which the PHP interpreter automatically finds and loads PHP classes as needed at runtime. This is an amazing feature that links many interoperable components of the modern PHP ecosystem.
