Get all the classes and functions in a file

test.php

<?php

declare(strict_types=1);

use Roave\BetterReflection\BetterReflection;
use Roave\BetterReflection\Reflector\ClassReflector;
use Roave\BetterReflection\Reflector\FunctionReflector;
use Roave\BetterReflection\SourceLocator\Type\SingleFileSourceLocator;

$fileName = 'my-file-with-stuff.php';

$sourceLocator = new SingleFileSourceLocator($fileName, (new BetterReflection())->astLocator());

$classReflector = new ClassReflector($sourceLocator);

$allTheClasses = $classReflector->getAllClasses();
$allTheFunctions = (new FunctionReflector($sourceLocator, $classReflector))->getAllFunctions();