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我正在开发一个自定义 Twig 过滤器，它将您的图像调整为设定的宽度（和自动高度）。

{# TWIG CODE #}
{% set imgpath = page.header.custom.bgimage|first.path %}
<div class="thumb" style="background-image: url({{ url(imgpath|resize(240)) }})"></div>

到目前为止它工作得很好，但是当页面的顺序改变时我遇到了一些错误。我想使用 Grav Debug Bar 进行调试，因为它非常方便并且保持代码干净。

在 Twig 中，您可以简单地使用{{ dump(message) }}.
不幸的是，调整大小的过程发生在原生 PHP 内部，所以我需要一种将消息从 PHP 输出到 Grav Debug Bar 的方法。
如文档中所述，您可以使用$grav['debugger']->addMessage($this).

这在调用 resize Twig 过滤器时会引发错误：

Twig_Error_Runtime
An exception has been thrown during the rendering of a template ("Undefined variable: grav").

为什么变量$grav未定义？

<?php namespace Grav\Common;

use \Grav\Common\Grav;
use \Grav\Common\Page\Page;
use \RocketTheme\Toolbox\ResourceLocator\UniformResourceLocator;
use \Eventviva\ImageResize;

include_once getcwd().'/user/plugins/resizer/lib/ImageResize.php';

class TwigResizerFilters extends \Twig_Extension
{
    private $grav;

    public function __construct() {
            $this->grav = Grav::instance();
    }

    public function getName() {
        return 'TwigResizeFilters';
    }

    public function getFilters() {
        return [
            new \Twig_SimpleFilter( 'resize', [$this, 'resizeImage'] )
        ];
    }

    public function resizeImage($mediapath, $maxWidth = 1920) {

        if (file_exists($mediapath)) {
            // if file exists

            if ($currImg = getimagesize($mediapath)) {
                // if is image

                if (preg_match('(jpg|jpeg|png)', $currImg['mime'])) {
                    // if file format correct

                    $resizedFolder = 'images/resized/';

                    // calculate exact img dimensions for proper naming
                    $maxHeight = floor(($maxWidth/$currImg[0]) * $currImg[1]);


                    if (!file_exists($resizedFolder)) {
                        // create folder if it does not exist
                        mkdir($resizedFolder, 0777, true);
                    }

                    // create filename
                    $resizedExtension = '.'.pathinfo($mediapath, PATHINFO_EXTENSION);
                    $resizedFilename = basename($mediapath, $resizedExtension).'@'.$maxWidth.'x'.$maxHeight.$resizedExtension;

                    if (file_exists($resizedFolder.$resizedFilename)) {
                        // if file already has been cached, just potput
                        return $resizedFolder.$resizedFilename;
                    } else {
                        // if not cached, resize to desired size

                        $image = new ImageResize($mediapath);
                        $image->resize($maxWidth, $maxHeight);
                        $image->save($resizedFolder.$resizedFilename);

                        return $resizedFolder.$resizedFilename;
                    }

                } else {
                    $grav['debugger']->addMessage("File type of ".$mediapath." is not supported.");
                }

            } else {
                $grav['debugger']->addMessage($mediapath." is not an image.");
            }

        } else {
            $grav['debugger']->addMessage("File ".$mediapath." does not exist.");
        }
    }

    private function mergeConfig( Page $page ) {
        $defaults = (array) $this->grav['config']->get('plugins.resizer');
        if ( isset($page->header()->resizer) ) {
            $this->grav['config']->set('plugins.resizer', array_merge($defaults, $page->header()->resizer));
        }
    }
}
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