Initial PHP Slim project structure; built a very basic site template

public/index.php

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+<?php
+
+// if we're looking for static files in dev, return false so they can be served.
+if (PHP_SAPI == 'cli-server') {
+  $url  = parse_url($_SERVER['REQUEST_URI']);
+  $file = __DIR__ . $url['path'];
+
+  // check the file types, only serve standard files
+  if (preg_match('/\.(?:png|js|jpg|jpeg|gif|css)$/', $file)) {
+    // does the file exist? If so, return it
+    if (is_file($file))
+        return false;
+
+    // file does not exist. return a 404
+    header($_SERVER['SERVER_PROTOCOL'].' 404 Not Found');
+    printf('"%s" does not exist', $_SERVER['REQUEST_URI']);
+    return false;
+  }
+}
+
+require_once __DIR__ .  '/../src/app.php';
+
+$app->run();
+