Question

我创建了一个博客，其中一些用户可以通过Wordpress信息中心上传图片。由于原始图像太大，网站很快陷入困境。有些用户在上传图片之前没有自己调整图片大小的知识，我不想手动调整图片大小。

有什么办法可以为上传的图片设置最大宽度和高度吗？我甚至不希望原件留在网站上。我希望网站上最大的图像版本与我设置的宽度和高度限制相匹配。

Answer 1

在主题的functions.php中添加此代码，它将使用重新调整大小的版本替换原始图像。

function replace_uploaded_image($image_data) {
// if there is no large image : return
if (!isset($image_data['sizes']['large'])) return $image_data;

// paths to the uploaded image and the large image
$upload_dir = wp_upload_dir();
$uploaded_image_location = $upload_dir['basedir'] . '/' .$image_data['file'];
$large_image_location = $upload_dir['path'] . '/'.$image_data['sizes']['large']['file'];

// delete the uploaded image
unlink($uploaded_image_location);

// rename the large image
rename($large_image_location,$uploaded_image_location);

// update image metadata and return them
$image_data['width'] = $image_data['sizes']['large']['width'];
$image_data['height'] = $image_data['sizes']['large']['height'];
unset($image_data['sizes']['large']);

return $image_data;
}

add_filter('wp_generate_attachment_metadata','replace_uploaded_image');

文章来源：http://goo.gl/nkszUn

Answer 2

那么为什么不创建新的图像尺寸？ http://codex.wordpress.org/Function_Reference/add_image_size

并在模板上使用该图片。

Answer 3

这适用于新图片上传以及旧图片上传，用管理员面板media settings中定义的大尺寸自动替换用户上传的大图片：

add_filter('wp_generate_attachment_metadata','replace_uploaded_image');
function replace_uploaded_image($image_data) {
    // if there is no large image : return
    if (!isset($image_data['sizes']['large'])) return $image_data;

    // paths to the uploaded image and the large image
    $upload_dir = wp_upload_dir();
    $uploaded_image_location = $upload_dir['basedir'] . '/' .$image_data['file'];
    // $large_image_location = $upload_dir['path'] . '/'.$image_data['sizes']['large']['file']; // ** This only works for new image uploads - fixed for older images below.
    $current_subdir = substr($image_data['file'],0,strrpos($image_data['file'],"/"));
    $large_image_location = $upload_dir['basedir'] . '/'.$current_subdir.'/'.$image_data['sizes']['large']['file'];

    // delete the uploaded image
    unlink($uploaded_image_location);

    // rename the large image
    rename($large_image_location,$uploaded_image_location);

    // update image metadata and return them
    $image_data['width'] = $image_data['sizes']['large']['width'];
    $image_data['height'] = $image_data['sizes']['large']['height'];
    unset($image_data['sizes']['large']);

    return $image_data;
}

上传时自动将Wordpress图像调整为最大宽度和高度？

3 个答案: