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@ 2021-06-09T11:59:33Z

<?php

declare(strict_types=1);

const PI_NAME = 'Число Пи';
const E_NAME = 'Число Эйлера';

final class Interpolator
{
    public function __construct(
        private string $format = '%s'
    ) {
    }

    public function __invoke(mixed $value): string
    {
        return sprintf($this->format, $value);
    }
}

$sprintfString = sprintf(
    <<<'JSON'
        [
          { "value": "%s", "name": "%s" },
          { "value": "%s", "name": "%s" }
        ]
        JSON,
    pi(),
    PI_NAME,
    M_E,
    E_NAME,
);

$intrp = new Interpolator();

$intrpString = <<<JSON
    [
      { "value": "{$intrp(pi())}", "name": "{$intrp(PI_NAME)}" },
      { "value": "{$intrp(M_E)}", "name": "{$intrp(E_NAME)}" }
    ]
    JSON;

var_dump(assert($sprintfString === $intrpString));

Output for git.master_jit, git.master, rfc.property-hooks: bool(true)

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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