hook_image_style_flush($style)
Respond to image style flushing.
This hook enables modules to take effect when a style is being flushed (all images are being deleted from the server and regenerated). Any module-specific caches that contain information related to the style should be cleared using this hook. This hook is called whenever a style is updated, deleted, or any effect associated with the style is update or deleted.
\Drupal\image\ImageStyleInterface $style: The image style object that is being flushed.
function hook_image_style_flush($style) { // Empty cached data that contains information about the style. \Drupal::cache('mymodule')->deleteAll(); }
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https://api.drupal.org/api/drupal/core!modules!image!image.api.php/function/hook_image_style_flush/8.1.x