LoaderCPsr4Autoloader.php

An example of a general-purpose implementation that includes the optional functionality of allowing multiple base directories for a single namespace prefix.

Added feature to have a default directory for unresolved namespaces.

Given a foo-bar package of classes in the file system at the following paths ...

/path/to/packages/foo-bar/
    src/
        Baz.php             # Foo\Bar\Baz
        Qux/
            Quux.php        # Foo\Bar\Qux\Quux
    tests/
        BazTest.php         # Foo\Bar\BazTest
        Qux/
            QuuxTest.php    # Foo\Bar\Qux\QuuxTest

... add the path to the class files for the \Foo\Bar\ namespace prefix as follows:

 <?php
 // instantiate the loader
 $loader = new \Example\Psr4AutoloaderClass;

 // register the autoloader
 $loader->register();

 // register the base directories for the namespace prefix
 $loader->addNamespace('Foo\Bar', '/path/to/packages/foo-bar/src');
 $loader->addNamespace('Foo\Bar', '/path/to/packages/foo-bar/tests');

The following line would cause the autoloader to attempt to load the \Foo\Bar\Qux\Quux class from /path/to/packages/foo-bar/src/Qux/Quux.php:

 <?php
 new \Foo\Bar\Qux\Quux;

The following line would cause the autoloader to attempt to load the \Foo\Bar\Qux\QuuxTest class from /path/to/packages/foo-bar/tests/Qux/QuuxTest.php:

 <?php
 new \Foo\Bar\Qux\QuuxTest;

Classes