将图片压缩转换为webp格式

typecho中，没有压缩图片或者转格式的，这个就是一个代码，将代码复制，保存为ImageOptimize.php,可以根据以下代码，创建一个插件。

<?php
/**
 * Typecho ImageOptimize Plugin
 * 自动将上传的 JPG/PNG 转为 WebP，生成响应式缩略图
 * 作者：typhonius
 * 适配：Typecho 1.2+
 */

class ImageOptimize_Plugin implements Typecho_Plugin_Interface
{
    public static function activate()
    {
        Typecho_Plugin::factory('Widget_Upload')->uploadFile = array('ImageOptimize_Plugin', 'optimizeUpload');
        Typecho_Plugin::factory('Widget_Upload')->deleteFile = array('ImageOptimize_Plugin', 'deleteOptimized');
    }

    public static function deactivate() {}

    public static function config(Typecho_Widget_Helper_Form $form)
    {
        $maxWidth = new Typecho_Widget_Helper_Form_Element_Text('maxWidth', null, '1200', _t('最大宽度'), _t('建议设置为1200，匹配博客内容宽度'));
        $form->addInput($maxWidth);

        $quality = new Typecho_Widget_Helper_Form_Element_Select('quality', array('70' => '70%', '80' => '80%', '90' => '90%'), '80', _t('压缩质量'));
        $form->addInput($quality);

        $convertWebp = new Typecho_Widget_Helper_Form_Element_Checkbox('convertWebp', array('1' => _t('启用WebP转换')), '1', _t('WebP转换'));
        $form->addInput($convertWebp);

        $deleteOriginal = new Typecho_Widget_Helper_Form_Element_Checkbox('deleteOriginal', array('1' => _t('删除原图')), '1', _t('节省空间，建议开启'));
        $form->addInput($deleteOriginal);
    }

    public static function personalConfig(Typecho_Widget_Helper_Form $form) {}

    public static function optimizeUpload($file, $type, $name, $path)
    {
        $config = Typecho_Widget::widget('Widget_Options')->plugin('ImageOptimize');
        if (!$config->convertWebp) return $file;

        $ext = strtolower(pathinfo($file, PATHINFO_EXTENSION));
        if (!in_array($ext, ['jpg', 'jpeg', 'png'])) return $file;

        $webpPath = preg_replace('/\.(jpg|jpeg|png)$/i', '.webp', $file);
        $image = imagecreatefromstring(file_get_contents($file));
        $width = imagesx($image);
        $height = imagesy($image);

        if ($width > $config->maxWidth) {
            $newWidth = $config->maxWidth;
            $newHeight = ($height * $newWidth) / $width;
            $newImage = imagecreatetruecolor($newWidth, $newHeight);
            imagecopyresampled($newImage, $image, 0, 0, 0, 0, $newWidth, $newHeight, $width, $height);
            imagejpeg($newImage, $webpPath, $config->quality);
            imagedestroy($newImage);
        } else {
            imagejpeg($image, $webpPath, $config->quality);
        }
        imagedestroy($image);

        if ($config->deleteOriginal) unlink($file);
        return $webpPath;
    }
}

学习代码。