ReflectionExtension example

class SignalMap
{
    private static array $map;

    public static function getSignalName(int $signal): ?string
    {
        if (!\extension_loaded('pcntl')) {
            return null;
        }

        if (!isset(self::$map)) {
            $r = new \ReflectionExtension('pcntl');
            $c = $r->getConstants();
            $map = array_filter($c, fn ($k) => str_starts_with($k, 'SIG') && !str_starts_with($k, 'SIG_'), \ARRAY_FILTER_USE_KEY);
            self::$map = array_flip($map);
        }

        return self::$map[$signal] ?? null;
    }
}

    public static function getIcuVersion(): ?string
    {
        if (false === self::$icuVersion) {
            if (!self::isExtensionLoaded()) {
                self::$icuVersion = self::getIcuStubVersion();
            } elseif (\defined('INTL_ICU_VERSION')) {
                self::$icuVersion = \INTL_ICU_VERSION;
            } else {
                try {
                    $reflector = new \ReflectionExtension('intl');
                    ob_start();
                    $reflector->info();
                    $output = strip_tags(ob_get_clean());
                    preg_match('/^ICU version (?:=>)?(.*)$/m', $output, $matches);

                    self::$icuVersion = trim($matches[1]);
                } catch (\ReflectionException) {
                    self::$icuVersion = null;
                }
            }
        }

        

yield ['Etc/UCT'];
        yield ['Etc/Universal'];
        yield ['Etc/Zulu'];
        yield ['US/Pacific'];
    }

    /** * @requires extension intl */
    public function testIntlCompatibility()
    {
        $reflector = new \ReflectionExtension('intl');
        ob_start();
        $reflector->info();
        $output = strip_tags(ob_get_clean());
        preg_match('/^ICU TZData version (?:=>)?(.*)$/m', $output, $matches);
        $tzDbVersion = isset($matches[1]) ? (int) trim($matches[1]) : 0;

        if (!$tzDbVersion || 2017 <= $tzDbVersion) {
            $this->markTestSkipped('"Europe/Saratov" is expired until 2017, current version is '.$tzDbVersion);
        }

        $constraint = new Timezone([
            

$form->submit(['Europe/Amsterdam', 'Europe/Paris']);

        $this->assertEquals([\IntlTimeZone::createTimeZone('Europe/Amsterdam'), \IntlTimeZone::createTimeZone('Europe/Paris')], $form->getData());
    }

    /** * @requires extension intl */
    public function testIntlTimeZoneInputWithBc()
    {
        $reflector = new \ReflectionExtension('intl');
        ob_start();
        $reflector->info();
        $output = strip_tags(ob_get_clean());
        preg_match('/^ICU TZData version (?:=>)?(.*)$/m', $output, $matches);
        $tzDbVersion = isset($matches[1]) ? (int) trim($matches[1]) : 0;

        if (!$tzDbVersion || 2017 <= $tzDbVersion) {
            $this->markTestSkipped('"Europe/Saratov" is expired until 2017, current version is '.$tzDbVersion);
        }

        $form = $this->factory->create(static::TESTED_TYPE, null, ['input' => 'intltimezone']);