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@ 2020-07-13T07:14:41Z

<?php

final class SomeImmutableObject
{
    private $someString;
    private $flagCreate = false;

    public function __construct(string $value)
    {

        if ($this->flagCreate === true) {
            throw new \BadMethodCallException('This immutable object has already been created.');
        }

        $this->someString = $value;
        $this->flagCreate = true;
    }

    public function getValue(): string
    {
        return 'the value is:' . $this->someString . ' - ';
    }
}

class TryToBreakImmutableObject extends SomeImmutableObject
{
    public $someString;

    public function __construct(string $value)
    {
        $this->someString = $value;
    }

    public function getValue(): string
    {
        return 'the value is:' . $this->someString . ' - ';
    }

    public function change(): void
    {
        $this->someString .= ' and Baz';
    }
}

$four = new TryToBreakImmutableObject('Foo');
echo $four->getValue(); //Foo
echo $four->change();
echo $four->getValue();

Output for git.master_jit, git.master: Fatal error: Class TryToBreakImmutableObject cannot extend final class SomeImmutableObject in /in/3vjQ0 on line 25 Stack trace: #0 {main}
Process exited with code 255.

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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