How Do I Fix Composer\'s PSR-4 Autoloading Warnings?

Class Autoloading Non-Compliance in Composer

Problem:
Composer v2.0 displays a warning about classes not complying with PSR-4 autoloading standards, specifically stating that a class's file path and namespace do not align.

Solution:
Path Case Mismatch:

• Verify that the file path components match the case of the corresponding namespaces.
• For example, FooBarBaz.php should not be located in foo/bar/Baz.php. Correct it to match: FooBarBaz.php.

File Name and Namespace Differences:

• Compare the namespace to the file path carefully.
• Ensure that any differences, such as FooBar in the class name and "foo-bar" in the file path, are corrected. Either rename the files or update the classes/namespaces to match.

Nested Namespaces and Declaration:

• When using nested namespaces:

  • Declare the nested namespace within the corresponding file.

  • For instance, a class named Dummy in the nested namespace FizzBuzzBuzz should be declared as:

    namespace Fizz\Buzz\Buzz;
    class Dummy {}

    Note that this requires updating any files using this class to declare:

    use Fizz\Buzz\Buzz\Dummy;

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