DateTime::createFromFormat(..）是否有一个小树枝替代方案 - Is there a twig alternative for DateTime::createFromFormat(...)?

我有一个表示周数和年份的字符串，希望输出本周的周日。

PHP示例：

$dateString = '502016';
$dateObject = DateTime::createFromFormat('WY', $dateString);
echo $dateObject->format('Y-m-d');

类似于：

{{ published_at|format(date("Ymd"), 'd-m-Y') }}

这在树枝上可能吗？

我发现了一些可以帮助您的东西：覆盖内置的树枝日期过滤器

它正在为您想要的内容创建一个新的分支扩展：(

PS：然后它返回一个PHP DateTime

<?php
/*
 * Extension to provide updated date & date_modify filters along with an
 * updated date function which do not auto-convert strings of numbers to
 * a unix timestamp.
 *
 * Code within dateFilter(), modifyFilter() and dateFromString() extracted
 * from Twig/lib/Twig/Extension/Core.php which is (c) 2009 Fabien Potencier
 * and licensed as per https://github.com/twigphp/Twig/blob/master/LICENSE
 */
namespace My'Twig'Extension;
use Twig_Extension;
use Twig_SimpleFilter;
use Twig_SimpleFunction;
use DateTime;
use DateTimeInterface;
use DateTimeImmutable;
class DateExtension extends Twig_Extension
{
    public function getName()
    {
        return 'my_date';
    }
    public function getFilters()
    {
        return array(
            new Twig_SimpleFilter('date', [$this, 'dateFilter'],
                    ['needs_environment' => true]),
            new Twig_SimpleFilter('date_modify', [$this, 'modifyFilter'],
                    ['needs_environment' => true]),
        );
    }
    public function getFunctions()
    {
        return array(
            new Twig_SimpleFunction('date', [$this, 'dateFromString'],
                    ['needs_environment' => true]),
        );
    }
    public function dateFilter($env, $date, $format = null, $timezone = null)
    {
        if (null === $format) {
            $formats = $env->getExtension('core')->getDateFormat();
            $format = $date instanceof DateInterval ? $formats[1] : $formats[0];
        }
        if ($date instanceof DateInterval) {
            return $date->format($format);
        }
        return $this->dateFromString($env, $date, $timezone)->format($format);
    }
    public function modifyFilter($env, $date, $format = null, $timezone = null)
    {
        $date = $this->dateFromString($env, $date, false);
        $date->modify($modifier);
        return $date;
    }
    public function dateFromString($env, $date, $timezone)
    {
        // determine the timezone
        if (!$timezone) {
            $defaultTimezone = $env->getExtension('core')->getTimezone();
        } elseif (!$timezone instanceof DateTimeZone) {
            $defaultTimezone = new DateTimeZone($timezone);
        } else {
            $defaultTimezone = $timezone;
        }
        // immutable dates
        if ($date instanceof DateTimeImmutable) {
            return false !== $timezone ? $date->setTimezone($defaultTimezone) : $date;
        }
        if ($date instanceof DateTime || $date instanceof DateTimeInterface) {
            $date = clone $date;
            if (false !== $timezone) {
                $date->setTimezone($defaultTimezone);
            }
            return $date;
        }
        $date = new DateTime($date, $defaultTimezone);
        if (false !== $timezone) {
            $date->setTimezone($defaultTimezone);
        }
        return $date;
    }
}

这个类只注册新的日期、date_modify过滤器和date函数来替换Twig核心中的那些，然后是直接的函数twig_date_format_filter、twig_data_modify_filter的副本和删除了上述功能的twig_date_converter。

我还需要向Twig_Environment注册此扩展使用：

$env->addExtension(new 'My'Twig'Extension'DateExtension());

我完了。

{{ "20141216"|date('jS F Y') }}
{{ "20141216"|date('jS F Y') }}

现在正确输出：2014年12月16日

不过，很遗憾我不能覆盖twig_date_converter，我很高兴我可以重新注册相关的CCD_ 3滤波器和功能。