fallback_intermediate_image_sizes

What is WordPress Hook: fallback_intermediate_image_sizes

The fallback_intermediate_image_sizes hook in WordPress is used to specify the image sizes that should be generated when uploading an image if the intermediate image sizes are not explicitly defined.

Understanding the Hook: fallback_intermediate_image_sizes

The fallback_intermediate_image_sizes hook is located within the image_resize_dimensions function in the wp-includes/media.php file. This function is responsible for generating the image sizes when an image is uploaded to WordPress.

Hook Parameters (if applicable): fallback_intermediate_image_sizes

The fallback_intermediate_image_sizes hook does not accept any arguments or parameters.

Hook Doesn’t Work: fallback_intermediate_image_sizes

If the fallback_intermediate_image_sizes hook is not working as expected, it could be due to conflicts with other plugins or themes that modify the image resizing process. It is recommended to deactivate other plugins and switch to a default theme to troubleshoot the issue.

Best Practices & Usage Notes (if applicable): fallback_intermediate_image_sizes

When using the fallback_intermediate_image_sizes hook, it is important to note that it should be used sparingly and only when necessary. Generating additional image sizes can impact server performance and consume more storage space. It is best practice to define the required image sizes in the theme or plugin code instead of relying on the fallback mechanism.

Usage Example: fallback_intermediate_image_sizes

“`php
function custom_image_sizes( $sizes ) {
$sizes[] = ‘custom-size’;
return $sizes;
}
add_filter( ‘fallback_intermediate_image_sizes’, ‘custom_image_sizes’ );
“`

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