example.php

<?php

// You can use an abstract class as well
trait Cachable {
    private $cache = [];

    public function cached($method, $args) {
        echo "[Cache] Called $method\n";

        if (!isset($this->cache[$method])) {
            echo "[Cache] Saving method in cache\n";
            $this->cache[$method] = $this->$method($args);
        }

        echo $this->cache[$method];
    }
}

abstract class Model {
    public function __call($method, $args)
    {
        $origMethod = preg_replace('/cached/', '', $method);

        if (preg_match('/cached.*/', $method) &&
                array_key_exists('Cachable', class_uses(get_class($this)))) {
            return $this->cached($origMethod, $args);
        } else {
            return $this->$origMethod($args);
        }
    }
}

class MyModel extends Model {
    use Cachable;

    public function getSlowQueryResults()
    {
        // Long operation
        return "[Result] Very long result...\n";
    }
}

$model = new MyModel();

echo $model->cachedGetSlowQueryResults();
echo $model->cachedGetSlowQueryResults();