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How to automatically use resized images instead of originals | Wordpress

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Place snippet in functions.php, edit maximum image size in Admin -> Settings -> Media -> Image Sizes ("Large Size") (Wordpress 3.1)

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  1. function replace_uploaded_image($image_data) {
  2.     // if there is no large image : return
  3.     if (!isset($image_data['sizes']['large'])) return $image_data;
  4.  
  5.     // paths to the uploaded image and the large image
  6.     $upload_dir = wp_upload_dir();
  7.     $uploaded_image_location = $upload_dir['basedir'] . '/' .$image_data['file'];
  8.     $large_image_location = $upload_dir['path'] . '/'.$image_data['sizes']['large']['file'];
  9.  
  10.     // delete the uploaded image
  11.     unlink($uploaded_image_location);
  12.  
  13.     // rename the large image
  14.     rename($large_image_location,$uploaded_image_location);
  15.  
  16.     // update image metadata and return them
  17.     $image_data['width'] = $image_data['sizes']['large']['width'];
  18.     $image_data['height'] = $image_data['sizes']['large']['height'];
  19.     unset($image_data['sizes']['large']);
  20.  
  21.     return $image_data;
  22. }
  23. add_filter('wp_generate_attachment_metadata','replace_uploaded_image');

URL: http://www.wprecipes.com/how-to-automatically-use-resized-image-instead-of-originals

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