WordPress自動調整文章中所上傳圖片的大小

下面這個腳本能使WordPress生成一個大幅圖片，并用該圖片代替用戶所上傳的圖片（如果所上傳圖片尺寸大于用戶的后臺設置），以節省服務器空間，如果你鏈接到的是原始圖片的縮略圖，還可以節省帶寬，效果和lightbox插件一樣。

只要將以下代碼添加到functions.php文件并保存即可。

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');

注意：不同主題對該代碼的支持程度會有所不同

原文：How to automatically use resized images instead of originals

出處：http://www.wordpress.la/

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