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PHP Value Objects

Examples

Table of contents

  1. Example with inheritance
    1. Single Value Object
    2. Single Immutable Value Object
  2. Example with composition
    1. Single Value Object
    2. Single Immutable Value Object

The following examples are equivalent, each having its caveats.

Example with inheritance

Single Value Object 

<?php

declare(strict_types=1);

namespace NorseBlue\ValueObjects\Examples;

use NorseBlue\ValueObjects\SingleValueObject;

class MyObject extends SingleValueObject
{
    /**
     * Validate the given value.
     *
     * @param mixed $value
     *
     * @return bool
     */
    public function isValid($value): bool
    {
        return is_int($value);
    }
}

Single Immutable Value Object 

<?php

declare(strict_types=1);

namespace NorseBlue\ValueObjects\Examples;

use NorseBlue\ValueObjects\SingleImmutableValueObject;

class MyObject extends SingleImmutableValueObject
{
    /**
     * Validate the given value.
     *
     * @param mixed $value
     *
     * @return bool
     */
    public function isValid($value): bool
    {
        return is_int($value);
    }
}

Example with composition

Single Value Object 

<?php

declare(strict_types=1);

namespace NorseBlue\ValueObjects\Examples;

use NorseBlue\ValueObjects\Contracts\SingleValueObject as SingleValueObjectContract;
use NorseBlue\ValueObjects\Traits\SingleValueObjectBehavior;

class MyObject implements SingleValueObjectContract
{
    use SingleValueObjectBehavior;

    /**
     * Validate the given value.
     *
     * @param mixed $value
     *
     * @return bool
     */
    public function isValid($value): bool
    {
        return is_int($value);
    }
}

Single Immutable Value Object 

<?php

declare(strict_types=1);

namespace NorseBlue\ValueObjects\Examples;

use NorseBlue\ValueObjects\Contracts\SingleValueObject as SingleValueObjectContract;
use NorseBlue\ValueObjects\Traits\SingleImmutableValueObjectBehavior;

class MyObject implements SingleValueObjectContract
{
    use SingleImmutableValueObjectBehavior;

    /**
     * Validate the given value.
     *
     * @param mixed $value
     *
     * @return bool
     */
    public function isValid($value): bool
    {
        return is_int($value);
    }
}