wp_generate_attachment_metadata filter-hook . WP 1.0

This filter is documented in wp-admin/includes/image.php

Usage

add_filter( 'wp_generate_attachment_metadata', 'filter_function_name_9663', 10, 3 );
function filter_function_name_9663( $image_meta, $attachment_id, $string ){
	// filter...

	return $image_meta;
}

$image_meta

-

$attachment_id

-

$string

-

Where the hook is called

$image_meta = apply_filters( 'wp_generate_attachment_metadata', $image_meta, $attachment_id, 'update' );

return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id, 'create' );

Where in WP core the hook is used WordPress