Defer PHP

<?php

function defer(&$ctx, callable $callable): void
{
    $ctx[] = new class($callable)
    {
        private $callable;

        public function __construct(callable $callable)
        {
            $this->callable = $callable;
        }

        public function __destruct()
        {
            call_user_func($this->callable);
        }
    };
}

function sayHello(): void
{
    defer($_, function () {
        echo "defer1\n";
    });
    defer($_, function () {
        echo "defer2\n";
    });

    echo "hello\n";
}

echo "before hello\n";
sayHello();
echo "after hello\n";

// Output:
//
// before hello
// hello
// defer1
// defer2
// after hello

class ValueObject
{
    private $value;

    public function getValue()
    {
        return $this->value;
    }

    public function setValue($value): void
    {
        $this->value = $value;
    }
}

function throwException(ValueObject $v): void
{
    defer($_, function () use ($v) {
        $v->setValue('after exception');
    });

    $v->setValue('before exception');

    throw new \Exception('My exception');
}


$value = new ValueObject();
try {
    throwException($value);
} catch (\Exception $e) {
} finally {
    echo $value->getValue(), "\n";
}

// Output:
//
// after exception