Sessao1.php

<?php

namespace Sessao\Entity;

use Doctrine\ORM\Mapping as ORM;
use Zend\Stdlib\Hydrator;

/**
 * @ORM\Entity
 * @ORM\Table(name="sessao")
 * @ORM\Entity(repositoryClass="Doctrine\ORM\EntityRepository")
 */
class Sessao {

    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue
     * @var int
     */
    protected $id;

    /**
     * @ORM\Column(type="text", length=150)
     * @var string
     */
    protected $titulo;

    /**
     * @ORM\Column(type="text")
     * @var int
     */
    protected $slug;

    /**
     * @ORM\Column(type="text")
     * @var string
     */
    protected $texto;

    public function __construct($options = null) {
        $hydrator = new Hydrator\ClassMethods;
        $hydrator->hydrate($options, $this);
    }
    
    public function __toString() {
        return $this->titulo;
    }

    public function __call ($methodName, $params = null) {
        $methodPrefix = substr($methodName, 0, 3);
        $property = strtolower(substr($methodName, 3));
        if ($methodPrefix == 'set' && count($params) == 1) {
            $this->$property = $params[0];
            return $this;
        } elseif ($methodPrefix == 'get' && property_exists($this, $property)) {
            return $this->$property;
        }

        throw new \Exception($methodName . ' não definido em ' . get_class($this));
    }

    public function toArray () {
        $reflect = new \ReflectionClass($this);
        $props   = $reflect->getProperties();

        $data = array();
        foreach ($props as $property) {
            $property = $property->getName();
            $data[$property] = $this->$property;
        }

        return $data;
    }

}

Sessao2.php

<?php

namespace Sessao\Entity;

use Doctrine\ORM\Mapping as ORM;
use Zend\Stdlib\Hydrator;

/**
 * @ORM\Entity
 * @ORM\Table(name="sessao")
 * @ORM\Entity(repositoryClass="Doctrine\ORM\EntityRepository")
 */
class Sessao {

    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue
     * @var int
     */
    protected $id;

    /**
     * @ORM\Column(type="text", length=150)
     * @var string
     */
    protected $titulo;

    /**
     * @ORM\Column(type="text")
     * @var int
     */
    protected $slug;

    /**
     * @ORM\Column(type="text")
     * @var string
     */
    protected $texto;

    public function __construct($options = null) {
        $hydrator = new Hydrator\ClassMethods;
        $hydrator->hydrate($options, $this);
    }

    public function getId() {
        return $this->id;
    }

    public function setId($id) {
        $this->id = $id;
        return $this;
    }

    public function getTitulo() {
        return $this->titulo;
    }

    public function setTitulo($titulo) {
        $this->titulo = $titulo;
        return $this;
    }

    public function getSlug() {
        return $this->slug;
    }

    public function setSlug($slug) {
        $this->slug = $slug;
        return $this;
    }

    public function getTexto() {
        return $this->texto;
    }

    public function setTexto($texto) {
        $this->texto = $texto;
        return $this;
    }

    public function __toString() {
        return $this->titulo;
    }

    public function toArray() {
        $hydrator = new Hydrator\ClassMethods;
        return $hydrator->extract($this);
    }

}