Doctrine Seriealize

serialize.php

<?php



/**
 * @ORM\Entity()
 * @ORM\Table(name="clientes")
 */
Class Clientes implements \JsonSerializable {
    /**
     * @var integer
     * @ORM\Id()
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string
     * @ORM\Column(type="string")
     */
    private $nome;

    /**
     * @var ArrayCollection|ImportacaoItem[]
     * @ORM\OneToMany(targetEntity="Endereco", mappedBy="cliente")
     */
    private $enderecos;

    public function __construct() {
        $this->enderecos = new ArrayCollection();
    }

    public function jsonSerialize()
    {
        return [
            'id' => $this->id,
            'nome' => $this->nome,
            'enderecos' => $this->enderecos->toArray()
        ];
    }

}

/**
 * @ORM\Entity()
 * @ORM\Table(name="enderecos")
 */
Class Endereco implements \JsonSerializable {
    /**
     * @var integer
     * @ORM\Id()
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @var string
     * @ORM\Column(type="string", name="id_endereco")
     */
    private $idEndereco;

    /**
     * @var string
     * @ORM\Column(type="string")
     */
    private $endereco;

    /**
     * @var string
     * @ORM\ManyToOne(targetEntity="Cliente", inversedBy="enderecos")
     * @ORM\JoinColumn(name="id_endereco", referencedColumnName="id")
     */
    private $enderecos;

    public function jsonSerialize()
    {
        return [
            'endereco' => $this->endereco
        ];
    }

}


$em = Doctrine\ORM\EntityManager::create($dbParams,$config); 
$cliente = $em->getRepository(Cliente::class)->find(1);
echo json_encode($cliente); //ex: {"id" : 1, "nome" : "Fulano de tal", "enderecos" : [{"endereco" : "Rua xxx"}, {"endereco" : "Rua yyy"}]}