How to get image name, mime type, width, height, file size from post custom field?

Question

What I need is some function to echo file name of image used in post like "image-file-name.jpg", or just "image-file-name".

Also it would be great to be able to have even more information about image like:

• image width,
• image height,
• image mime type / format,
• image file size,
• image extension.

Also this may be helpful, I have custom field named 'image_full_url' which contains full url address of image used in post. For example content of custom field named 'image_full_url' is:

http://www.example.com/wp-content/uploads/2012/12/image-file-name.jpg

I am using that custom field to echo that URL when I need it, and it would be nice to have something similar to echo other data about image.

Answer 1

You can get the file from your Url like this:

//get the URL from your Metafield, $post is your current Post
$image = get_post_meta( $post->ID, '_your_image_url_meta', true );

//set up a query to search your posts table for the Url         
global $wpdb;
$query = "SELECT ID FROM $wpdb->posts WHERE guid = %s LIMIT 1";

//prepare and launch the query
$result = $wpdb->get_results( $wpdb->prepare( $query, $image ) );

//if there are results
if ( count ( $result ) > 0 ) {

    $image_id = $result['0']->ID;

    //get the image data
    $image_data = get_post_meta( $image_id, '_wp_attachment_metadata', true );

}   

All the information you need should now be available in $image_data. Keep in mind that you may need to change the script a little bit - for example if your Authors put in a thumbnail-url, you have to clean it first and change the query to a LIKE statement.

Answer 2

If you have declare every field of image in custom field. Use following code for getting all post custom feild data;

<?php 
 while ( have_posts() ) : the_post(); 
 $postid=$post->ID;
 $all_meta_for_post = get_post_meta( $postid );    
 endwhile; 
?>