U-M Dynamic ImagesDynamic Images

Replaces wordpress built-in pre-built image thumbnails with a dymamic system that creates them on the fly. Greate for larger sites with a large upload set. Reduces on-disk needs by only storing full res images and thumbnail cache which is purged regularly.

NOTE: This has only been tested with apache using .htaccess It would likely need adjustments to work in other environments

Install

WP Admin/Dashboard Method

This requires that your site has write access to the plugins folder.

1. Download the latest package (e.g. umich-dynamic-images-x.x.x.zip)
2. Go to WP Admin/Dashboard -> Plugins -> Add New -> Upload Plugin
3. Select the downloaded zip file and Upload
4. Activate Plugin
5. Configure plugin settings (WP Admin/Dashboard -> Settings -> U-M: Dynamic Images

   Manual Method

6. Download the latest package (e.g. umich-dynamic-images-x.x.x.zip)
7. Extract zip
8. Upload the umich-dynamic-images folder to wp-content/plugins/ folder in your site
9. Activate Plugin
10. Configure plugin settings (WP Admin/Dashboard -> Settings -> U-M: Dynamic Images

Custom Integrations

Filters

umich-dynamic-images_url-rewrites

Override plugin custom rewrite rules locating uploaded assets to be handled by the plugin.

add_filter( 'umich-dynamic-images_url-rewrites', function( $rules ){
    // your code here to modify rules

    return $rules;
});

umich-dynamic-images_url-rewrite-conditions

Override plugin custom rewrite conditions locating uploaded assets to be handled by the plugin.

add_filter( 'umich-dynamic-images_url-rewrites', function( $rules ){
    // your code here to modify rules

    return $rules;
});

umich-dynamic-images_url-patterns

Request regex rules to identify uploaded image thumbnail requests. Note that these regex rules require "Named Capture Groups".

• path

• file

• suffix

• extension

• width

• height

• crop

  add_filter( 'umich-dynamic-images_url-rewrites', function( $rules ){
    // your code here to modify rules
  
    return $rules;
  });

umich-dynamic-images_extensions

Alter the list of extensions that are to be managed by this plugin rather than wordpress.

add_filter('umich-dynamic-images_extensions', function( $extensions ){
    // your code here to modify extensions list

    return $extensions;
});

Actions

umich_dynamic_images_admin_settings_save

Called before dynamic images settings are saved

$settings: the settings stored in the options table
$hasErrors: boolean if the form had errors
add_action( 'umich_dynamic_images_admin_settings_save', function( $settings, $hasErrors ){
    // do something
});