How to use Composer to autoload classes from outside the vendor?

The src directory would be in your project root.
Its on the same level as vendor directory is.

If you define

"autoload": {
    "psr-4": {
        "DG\\Munchkin\\": "src/DG/Munch/"

this will not load classes from /var/www/html/xxx/vendor/yyy/src/DG/Munch,
like you stated.

Because your project structure is:

 +- /xxx (project)
     - composer.json
     +- /src
        +- DG
           +- Munch
     +- /vendor
        - autoload.php
        +- vendor-projectA
        +- vendor-projectB
        +- yyy

The \DG\Munchkin namespace would map to classes inside

/var/www/html/xxx/src/DG/Munch and not inside


But how can I load classes from /var/www/html/xxx/?

Define the paths in the composer.json (inside /var/www/html/xxx/) of your project:

"autoload": {
    "psr-4": {
        "ProjectRoot\\" : "", 
        "NamspaceInSourceDir\\" : "src/"         

or load the composer autoloader in your index.php or during it’s bootstrap and add the paths manually:

$loader = require 'vendor/autoload.php';
$loader->add('Namespace\\Somewhere\\Else\\', __DIR__);
$loader->add('Namespace\\Somewhere\\Else2\\', '/var/www/html/xxx');


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