Adding Alt Attributes Automatically when Uploading Images to Media Library

2 comments

1. A viable solution I found was adding the post title to images missing the ALT attribute.

   Add the following to your functions.php file:

   function add_alt_tags($content)
   {
           global $post;
           preg_match_all('/<img (.*?)/>/', $content, $images);
           if(!is_null($images))
           {
                   foreach($images[1] as $index => $value)
                   {
                           if(!preg_match('/alt=/', $value))
                           {
                                   $new_img = str_replace('<img', '<img alt="'.$post->post_title.'"', $images[0][$index]);
                                   $content = str_replace($images[0][$index], $new_img, $content);
                           }
                   }
           }
           return $content;
   }
   add_filter('the_content', 'add_alt_tags', 99999);
   

   Alternatively, if you want to replace the attribute with the file name, you could look into using the get_attached_file function for the $new_img variable.

2. I know I am very late to the party, but I couldn’t let this one pass because I wrote a plugin just for this: Auto Image Attributes From Filename With Bulk Updater

   As the name suggests, there is a bulk updater as well, so you can update existing images as well.

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