gistfile1.php

<?php

class FoobarData
{
    private $name;
    
    /**
     * Create DTO, optionally extracting data from a model.
     *
     * @param Foobar|null $foobar
     */
    public function __construct(?Foobar $foobar = null)
    {
        if ($foobar instanceof Foobar) {
            $this->extract($foobar);
        }
    }
    
    /**
     * Fill model with data from the DTO.
     *
     * @param Foobar $foobar
     * @return Foobar
     */
    public function fill(Foobar $foobar): Foobar
    {
        $foobar
            ->setName($this->getName())
        ;
        
        return $foobar;
    }
    
    /**
     * Extract data from model into the DTO.
     *
     * @param Foobar $foobar
     * @return self
     */
    public function extract(Foobar $foobar): self
    {
        $this->setName($foobar->getName());
        
        return $this;
    }
    
    public function getName(): ?string
    {
        return $this->name;
    }
    
    public function setName(string $name): self
    {
        $this->name = $name;
        return $this;
    }