(action)_prefilter filter-hook . WP 2.9.0

Filters the data for a file before it is uploaded to WordPress.

The dynamic portion of the hook name, $action, refers to the post action.

add_filter( '(action)_prefilter', 'filter_function_name_70' );
function filter_function_name_70( $file ){
	// filter...

	return $file;
}

(action)_prefilter

$file = apply_filters( "{$action}_prefilter", $file );

add_filter( 'wp_handle_upload_prefilter', 'check_upload_size' );

add_filter( 'add_term_metadata', 'wp_check_term_meta_support_prefilter' );

add_filter( 'update_term_metadata', 'wp_check_term_meta_support_prefilter' );

add_filter( 'delete_term_metadata', 'wp_check_term_meta_support_prefilter' );

add_filter( 'get_term_metadata_by_mid', 'wp_check_term_meta_support_prefilter' );

add_filter( 'update_term_metadata_by_mid', 'wp_check_term_meta_support_prefilter' );

add_filter( 'delete_term_metadata_by_mid', 'wp_check_term_meta_support_prefilter' );

add_filter( 'update_term_metadata_cache', 'wp_check_term_meta_support_prefilter' );

add_filter( 'get_term_metadata', 'wp_check_term_meta_support_prefilter' );

add_filter( 'update_blog_metadata_by_mid', 'wp_check_site_meta_support_prefilter' );

add_filter( 'update_blog_metadata_cache', 'wp_check_site_meta_support_prefilter' );

add_filter( 'delete_blog_metadata_by_mid', 'wp_check_site_meta_support_prefilter' );

add_filter( 'get_blog_metadata', 'wp_check_site_meta_support_prefilter' );

add_filter( 'get_blog_metadata_by_mid', 'wp_check_site_meta_support_prefilter' );

add_filter( 'delete_blog_metadata', 'wp_check_site_meta_support_prefilter' );

add_filter( 'update_blog_metadata', 'wp_check_site_meta_support_prefilter' );

add_filter( 'add_blog_metadata', 'wp_check_site_meta_support_prefilter' );

add_filter( 'update_blog_metadata_cache', 'wp_check_site_meta_support_prefilter' );