沉冰浮水

function ActivePlugin_acgME()
{
  Add_Filter_Plugin('Filter_Plugin_ViewList_Template', 'acgME_Main');
  Add_Filter_Plugin('Filter_Plugin_Post_Thumbs', 'acgME_Thumbs');
  Add_Filter_Plugin('Filter_Plugin_Zbp_BuildTemplate', 'acgME_BuidTemp');
}
function acgME_Main(&$template)
{
  global $zbp;
  // Traverse articles to set images
  if ($articles = $template->GetTags('articles')) {
    foreach ($articles as $article) {
      acgME_SetIMG($article);
    }
  }
  // else if ($article = $template->GetTags('article')) {
  //   acgME_SetIMG($article);
  // }
}
// Interface function
function acgME_Thumbs($article, &$all_images, $width, $height, $count, $clip)
{
  $rndNum = $article->ID % 19 + 1;
  $rndImg = acgME_Path("v-noimg", "host") . $rndNum . ".jpg";
  // $all_images contains images in the article content, which may be empty, so add a default image;
  $all_images[] = $rndImg;
  Thumb::changeDefaultImg($rndImg); // Use this when there is an image but thumbnail creation fails;
}
// Assign value to property through encapsulated function for calling
function acgME_SetIMG(&$article)
{
  if (!isset($article->Img_640x360)) {
    $article->Img_640x360 = $article->Thumbs(640, 360, 1, false)[0];
    // ↑ The value obtained here cannot be saved, please use Metas to save
  }
}
// For slides
function acgME_BuidTemp(&$templates)
{
  global $zbp;
  // Slides
  $templates['n-slide'] = "";
  if (!$zbp->template->HasTemplate("m-slide")) {
    return;
  }
  $uFile = acgME_Path("u-slide");
  if (!is_file($uFile)) {
    return;
  }
  // Core part
  $slides = json_decode(file_get_contents($uFile));
  foreach ($slides as $key => &$item) {
    $item->Img_142x80 = Thumb::Thumbs([$item->Img], 142, 80, 1, false)[0];
    $item->Img_647x404 = Thumb::Thumbs([$item->Img], 647, 404, 1, false)[0];
  }
  $zbp->template->SetTags('slides', $slides);
  $templates['n-slide'] = $zbp->template->Output("m-slide");
  $script = $zbp->host . 'zb_users/theme/acgME/script/swiper-3.4.2.jquery.min.js';
  $templates['n-slide'] .= '{php}$footer .= \'<script src="' . script .'"></script>\'{/php}';
  $script = $zbp->host . 'zb_users/theme/acgME/script/swiper-act.js';
  $templates['n-slide'] .= '{php}$footer .= \'<script src="' . $script . '"></script>\'{/php}';
}

<div class="post-img"><img src="{$article.Img_640x360}" alt="{$article.Title}"></div>

  public function handle()
  {
    if ($this->shouldClip) {
      // Original image: width/height
      $src_scale = ($this->srcWidth / $this->srcHeight);
      // New image: width/height
      $dst_scale = ($this->dstWidth / $this->dstHeight);

      // Height: original/new
      $h_scale = ($this->srcHeight / $this->dstHeight);
      // Width: original/new
      $w_scale = ($this->srcWidth / $this->dstWidth);

      // Target width for cropping the original image (horizontal)
      $w_des = ($this->dstWidth * $h_scale);
      // Target height for cropping the original image (vertical)
      $h_des = ($this->dstHeight * $w_scale);

      // Determine cropping direction based on the change in scale
      if ($src_scale >= $dst_scale) {
        // 24:15 // Original image 8:5
        // 12:10 // Target 6:5
        // x:15 = 12:10
        // x = 18 = 12*(15/10) = 15*(12/10) // $w_des
        // Keep the height of the original image and crop the width to $w_des
        $dst_widthx = (($this->srcWidth - $w_des) / 2); // ((24-18)/2)
        $this->clip($dst_widthx, 0, $w_des, $this->srcHeight);
        // Crop the original image to 18:15 and then scale it to 12:10
        $this->zoom($this->dstWidth, $this->dstHeight);
      } else {
        // 24:15 // Original image 8:5
        // 40:20 // Target 10:5
        // 24:y = 40:20
        // y = 12 = 20*(24/40) = 24/(40/20) // $h_des
        // Keep the width of the original image and crop the height to $h_des
        $dst_heighty = (($this->srcHeight - $h_des) / 2); // ((15-12)/2)
        $this->clip(0, $dst_heighty, $this->srcWidth, $h_des);
        // In theory, when the target size is larger than the original image size, you can choose to return an image with a size of 24:12, which is the size obtained from the previous step of cropping
        $this->zoom($this->dstWidth, $this->dstHeight); // In reality, it will return an image with a size of 24:15
      }
    } else {
      $this->zoom($this->dstWidth);
    }
    $this->save();
    imagedestroy($this->srcRes);
  }