我使用了很多缩略图，但从未使用原始文件。为了节省空间，我想阻止原始文件保存在磁盘上，但只保留100px的缩略图。我该怎么做？
谢谢，丹尼斯
删除原始图像-保留缩略图？
7 个回复
最合适的回答,由SO网友:Cristian 整理而成
add_filter( \'wp_generate_attachment_metadata\', \'delete_fullsize_image\' );
function delete_fullsize_image( $metadata )
{
$upload_dir = wp_upload_dir();
$full_image_path = trailingslashit( $upload_dir[\'basedir\'] ) . $metadata[\'file\'];
$deleted = unlink( $full_image_path );
return $metadata;
}
SO网友:SimonSimCity
我在网上找到了另一个解决方案。这是基于这里所接受的，但它更进一步。
此处接受的一个删除了主图像并继续。我找到的解决方案用为“大”生成的图像替换了原始图像。如果未定义此图像分辨率，它将继续运行而不替换。
这样可以确保依赖于原始图像的每个脚本仍能像以前一样工作，例如thumnail再生。
http://www.wprecipes.com/how-to-automatically-use-resized-image-instead-of-originals
EDIT:
@dalbaeb向我指出了博客评论中的一个问题。我根据API而不是那里提供的解决方案重写了代码。这并没有多大区别，只是为了使用与API中相同的函数调用；）function replace_uploaded_image($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_filename = $image_data[\'sizes\'][\'large\'][\'file\'];
// Do what wordpress does in image_downsize() ... just replace the filenames ;)
$image_basename = wp_basename($uploaded_image_location);
$large_image_location = str_replace($image_basename, $large_image_filename, $uploaded_image_location);
// delete the uploaded image
unlink($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\']);
// Check if other size-configurations link to the large-file
foreach($image_data[\'sizes\'] as $size => $sizeData) {
if ($sizeData[\'file\'] === $large_image_filename)
unset($image_data[\'sizes\'][$size]);
}
return $image_data;
}
add_filter(\'wp_generate_attachment_metadata\', \'replace_uploaded_image\');
EDIT2:
我在一个客户端上遇到了代码问题，其中另一个大小配置链接到了一个大文件。我相应地更新了代码。如果你有什么问题，给我发封邮件。SO网友:Carlos Minatti
我只是创建了一个插件，因为我有同样的问题。您可以从下载here
SO网友:Pitchpole
我知道这很旧，但我仍然需要解决这个问题，当我在函数中使用它时，这可能对新图像有效。php，但我确实有一些问题和图像变得不可用，我也无法利用这一点来更新现有的图像。我有大约2000张现有的图片，我需要把它们全部浏览一遍，把所有旧的大图片缩小。我在前端创建了一个只有管理员才能访问的页面，并使用了此代码。
这里最大的区别在于，不是删除OG图像，而是将“大”图像重命名为OG名称。（这对我不起作用，我尝试这种方法时丢失了很多图像），因此我复制了大图像，并将其命名为与OG图像相同的副本。因此，大图像会被较小的“大”图像覆盖。同样在前端，我必须改变元数据的更新方式。
Test this on individual posts first, be sure this works for you before changing numposts to -1. I stupidly lost about 100 images trying to run the original code without carefully checking the results first.
更新现有图像的前端代码：
function replace_uploaded_image_frontend($image_data, $attachment_id) {
// if there is no large image : return
if (!isset($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\'];
$current_subdir = substr($image_data[\'file\'],0,strrpos($image_data[\'file\'],"/"));
$large_image_location = $upload_dir[\'basedir\'] . \'/\'.$current_subdir.\'/\'.$image_data[\'sizes\'][\'large\'][\'file\'];
//Original code was delete OG file and rename the large file to the OG name. This means you no longer have the large size image. So...
//Instead I want to take the large file and make a copy and overwrite it over the large file.
$file_to_be_copied = $large_image_location;
$copied_file_name = $uploaded_image_location;
//make a copy of the large image and name that the title of the original image
if (!copy($file_to_be_copied, $copied_file_name)) {
echo "failed to copy $file...\\n";
}
fixImageMeta($attachment_id );
}
function fixImageMeta($attach_id) {
$file = get_attached_file($attach_id);
if (!empty($file)) {
$info = getimagesize($file);
$meta = array (
\'width\' => $info[0],
\'height\' => $info[1],
\'hwstring_small\' => "height=\'{$info[1]}\' width=\'{$info[0]}\'",
\'file\' => basename($file),
\'sizes\' => array(), // thumbnails etc.
\'image_meta\' => array(), // EXIF data
);
update_post_meta($attach_id, \'_wp_attachment_metadata\', $meta);
}
}
$args = array(
\'post_type\' => \'exhibitions\',
\'p\' => 12926,
\'order\' => \'DESC\',
/*\'date_query\' => array(
\'after\' => array(
\'year\' => 2016,
\'month\' => 2,
\'day\' => 28,
),
\'before\' => array(
\'year\' => 2016,
\'month\' => 6,
\'day\' => 30,
),
),*/
\'numberposts\' => 1
);
$myposts = get_posts($args);
foreach ($myposts as $mypost){
$attachment_id = get_post_thumbnail_id( $mypost->ID );
echo \'<br>Attach ID: \' . $attachment_id . \' \';
$unfiltered = false;
$image_data = wp_get_attachment_metadata( $attachment_id, $unfiltered );
print_r($image_data);
replace_uploaded_image_frontend($image_data, $attachment_id);
}
新图像的代码，在函数中。php
function replace_uploaded_image($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\'];
$current_subdir = substr($image_data[\'file\'],0,strrpos($image_data[\'file\'],"/"));
$large_image_location = $upload_dir[\'basedir\'] . \'/\'.$current_subdir.\'/\'.$image_data[\'sizes\'][\'large\'][\'file\'];
//Instead I want to take the large file and make a copy and overwrite it over the original file.
$file_to_be_copied = $large_image_location;
$copied_file_name = $uploaded_image_location;
//make a copy of the large image and name that the title of the original image
if (!copy($file_to_be_copied, $copied_file_name)) {
echo "failed to copy $file...\\n";
}
// update image metadata and return them
$image_data[\'width\'] = $image_data[\'sizes\'][\'large\'][\'width\'];
$image_data[\'height\'] = $image_data[\'sizes\'][\'large\'][\'height\'];
return $image_data;
}
add_filter(\'wp_generate_attachment_metadata\',\'replace_uploaded_image\');
SO网友:Joris van Montfort
上面的答案似乎不再适用了。我稍微修改了代码，下面的示例适用于WordPress 5.5
function replace_uploaded_image($image_data) {
// if there is no large image : return
if (!isset($image_data[\'sizes\'][\'2048x2048\'])) return $image_data;
// paths to the uploaded image and the large image
$upload_dir = wp_upload_dir();
$uploaded_image_location = dirname($upload_dir[\'basedir\'] . \'/\' . $image_data[\'file\']) . \'/\' . $image_data[\'original_image\'];
// delete the uploaded image
unlink($uploaded_image_location);
unset($image_data[\'original_image\']);
return $image_data;
}
add_filter(\'wp_generate_attachment_metadata\', \'replace_uploaded_image\');```
SO网友:ztvmark
Wordpress禁用上载图像原件
测试wordpress 5.6
通过https://stackoverflow.com/questions/41626139/wordpress-removing-original-image-after-resize
function replace_uploaded_image($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;
}
add_filter(\'wp_generate_attachment_metadata\',\'replace_uploaded_image\');
SO网友:Francois
上述解决方案的问题是，未链接的图像是“big\\u image\\u size\\u threshold”中的缩放图像。（自WP 5.3起）如果您添加：
add_filter( \'big_image_size_threshold\', \'__return_false\' );
结束