Question

我试图实现两个PHP函数来禁用动画的WordPress上gif图像的图像大小调整。如果文件MIME类型是gif，则有solution来禁用上传，但这还不够。 gif也可以只是一个图像。所以我认为我将它与一个PHP脚本结合起来，通过使用这个solution来检查文件是否是动画gif。如果我在我的主题文件中回显这个函数，这似乎有效，但如果我在functions.php中使用它似乎没有功能。

/**
* Detects animated GIF from given file pointer resource or filename.
*
* @param resource|string $file File pointer resource or filename
* @return bool
*/
function is_animated_gif($file)
{
    $fp = null;

    if (is_string($file)) {
        $fp = fopen($file, "rb");
    } else {
        $fp = $file;

        /* Make sure that we are at the beginning of the file */
        fseek($fp, 0);
    }

    if (fread($fp, 3) !== "GIF") {
        fclose($fp);

        return false;
    }

    $frames = 0;

    while (!feof($fp) && $frames < 2) {
        if (fread($fp, 1) === "\x00") {
            /* Some of the animated GIFs do not contain graphic control extension (starts with 21 f9) */
            if (fread($fp, 1) === "\x21" || fread($fp, 2) === "\x21\xf9") {
                $frames++;
            }
        }
    }

    fclose($fp);

    return $frames > 1;
}

function disable_upload_sizes( $sizes, $metadata ) {

  $uploads = wp_upload_dir();
  $upload_path = $uploads['baseurl'];
  $relative_path = $metadata['file'];
  $file_url = $upload_path . $relative_path;

  if( is_animated_gif( $file_url ) ) {
    $sizes = array();
  }

  // Return sizes you want to create from image (None if image is gif.)
  return $sizes;
}   
add_filter('intermediate_image_sizes_advanced', 'disable_upload_sizes', 10, 2);

我在这里做错了什么，这不起作用？

Answer 1

您的代码有效...但$file_url上有错误。

应为$file_url = $upload_path . '/' . $relative_path;

如果动画gif禁用图像大小调整

1 个答案: