Dependecy Injection Example1

gistfile1.php

<?php
// WRONG
class Foo1
{
    public function bar()
    {
        $cache  = Cache::singleton('Memcached');
        $result = $cache->get('keyname');
        // do some stuff with the result
    }
}

// CORRECT
class Foo2
{
    protected $cache = null;

    public function bar()
    {
        $cache  = $this->getCache();
        $result = $cache->get('keyname');
        // do some stuff with the result
    }

    protected function getCache()
    {
        if ($this->cache === null) {
            $this->cache = Cache::singleton('Memcached');
        }
        return $this->cache;
    }
}
?>