Default repository layout - PHP web application

.gitignore

vendor # ignore composer data

# ignore PHP Storm config
# you may want to ignore your IDE config and you may want to commit it, up to you
.idea

composer.json

{
  // ...
  "autoload": {
    "psr-4": { "MyAppNamespace\\": "src/" },
    "files": ["src/functions.php"]
  }
}

config ∕ .gitignore

# this just ignores everything in this folder, while allowing you to commit the "empty" folder to git
*

Directory Layout

|
+- .git
+- [public] # this is the web server document root, all requests for URIs that don't point to existing files are routed to index.php 
|   +- [static]
|   |   +- # static files; CSS, JS, images etc
|   +- index.php
+- [config]
|   +- .gitignore
+- [src]
|   +- <PSR-4 namespaced classes>
|   +- launcher.php
|   +- bootstrap.php
|   +- functions.php # there may be more than one of these, e.g. for different namespaces
+- .gitignore
+- .gitattributes
+- composer.json
+- composer.lock
+- readme.md

public ∕ index.php

<?php declare(strict_types = 1);

require __DIR__ . '/../launcher.php';

src ∕ bootstrap.php

<?php declare(strict_types = 1);

namespace MyAppNamespace;

require __DIR__ . '/../vendor/autoload.php';
require __DIR__ . '/../config/config.php'; // load app config, may be more complex e.g. JSON/yaml files etc

// any other startup actions that are required for every application entry point, e.g. if you have any command line scripts

src ∕ launcher.php

<?php declare(strict_types = 1);

namespace MyAppNamespace;

require __DIR__ . '/bootstrap.php';

// this is the actual entry point for the web application, app logic goes here