graphql-php/tests/Executor/TestClasses.php

<?php
namespace GraphQL\Executor;

use GraphQL\Type\Definition\ScalarType;

class Dog
{
    function __construct($name, $woofs)
    {
        $this->name = $name;
        $this->woofs = $woofs;
    }
}

class Cat
{
    function __construct($name, $meows)
    {
        $this->name = $name;
        $this->meows = $meows;
    }
}

class Human
{
    function __construct($name)
    {
        $this->name = $name;
    }
}

class Person
{
    public $name;
    public $pets;
    public $friends;

    function __construct($name, $pets = null, $friends = null)
    {
        $this->name = $name;
        $this->pets = $pets;
        $this->friends = $friends;
    }
}

class ComplexScalar extends ScalarType
{
    public static function create()
    {
        return new self();
    }

    public $name = 'ComplexScalar';

    public function serialize($value)
    {
        if ($value === 'DeserializedValue') {
            return 'SerializedValue';
        }
        return null;
    }

    public function parseValue($value)
    {
        if ($value === 'SerializedValue') {
            return 'DeserializedValue';
        }
        return null;
    }

    public function parseLiteral($valueAST)
    {
        if ($valueAST->value === 'SerializedValue') {
            return 'DeserializedValue';
        }
        return null;
    }
}