high-coupling-example.php

<?php
namespace Acme\Movie;

class SomeDatabaseMapper
{
    public function findAll($table)
    {
        //Find all entries in some way
    }
}

class MovieFinder
{
    public function findAll()
    {   
        return (new SomeDatabaseMapper)->findAll("movies");
    }
}
 
class MovieLister
{
    public function list()
    {   
        return (new MovieFinder)->findAll();
    }
}
 
$movieLister = new MovieLister;
$movieList = $movieLister->list();