example of composer autoload and namespaces

index2.php - Using "require_once" with no autoloading

• namespaces are not required for each file/class, but we can use them... optional.

require_once "./app/Email.php";

index.php - composer autoload

• namespaces are required, it is used to map directories in composer.json
• we do not need require_once for each class
• we do need require_once for composer autoload

require_once "./vendor/autoload.php";

• Some notes for the composer.json file
• • current folder
• • • "namespace1\\": "./folder",
• • Back up 1 dir, OUTSIDE the project, or outside the public_html folder
• • • "namespace2\\": "../folder",
• • root, usually files in public_html
• • • "": ".",

/* 
"autoload": {
        "psr-4": {
            "MYAPP\\": "./app/",
            "MYCORE\\": "./core/",
            "": "."
        }
    },
*/

if using git

• Make to check in/add both composer.json and `composer.lock' to repo too.
• Add vendor to .gitignore, not need in git repo.

Notes

• The Environment I tested this as localhost I created in Windows 11. Local apache server and php