How can automatic class loading be configured using Composer?

Automatic class loading in Composer is configured through the autoload section in the composer.json file. Main methods:

• PSR-4 autoloading — maps namespaces to directories.
• PSR-0 autoloading — an older standard similar to PSR-4.
• classmap — specifies specific files or directories to scan.
• files — loads specified files directly.

Example PSR-4 configuration:

{
  "autoload": {
    "psr-4": {
      "App\\": "src/"
    }
  }
}

After changing composer.json, run composer dump-autoload to update the autoloader.