gistfile1.php

<?php

public function load(ObjectManager $manager)
{
    $jokes = array(
        'There’s no place like 127.0.0.1',
        'If at first you don’t succeed; call it version 1.0',
        'You know it’s love when you memorize her IP number to skip DNS overhead',
        'Beware of programmers that carry screwdrivers',
        'What color do you want that database?'
    );

    foreach ($jokes as $item) {
        $joke = new Joke();
        $joke->setContent($item);

        $manager->persist($joke);
    }

    $manager->flush();
}