WordPress at a glance
filter is not described

upgrader_clear_destination filter-hook . WP 2.8.0

Filters whether the upgrader cleared the destination.

Usage

add_filter( 'upgrader_clear_destination', 'filter_function_name_151', 10, 4 );
function filter_function_name_151( $removed, $local_destination, $remote_destination, $hook_extra ){
	// filter...

	return $removed;
}
$removed(true/WP_Error)
Whether the destination was cleared. true upon success, WP_Error on failure.
$local_destination(string)
The local package destination.
$remote_destination(string)
The remote package destination.
$hook_extra(array)
Extra arguments passed to hooked filters.

Changelog

Since 2.8.0 Introduced.

Where the hook is called

WP_Upgrader::install_package()
upgrader_clear_destination
wp-admin/includes/class-wp-upgrader.php 572
$removed = apply_filters( 'upgrader_clear_destination', $removed, $local_destination, $remote_destination, $args['hook_extra'] );

Where in WP core the hook is used WordPress

wp-admin/includes/class-wp-upgrader.php 213
add_filter( 'upgrader_clear_destination', array( $this, 'delete_old_plugin' ), 10, 4 );
wp-admin/includes/class-wp-upgrader.php 240
remove_filter( 'upgrader_clear_destination', array( $this, 'delete_old_plugin' ) );
wp-admin/includes/class-wp-upgrader.php 288
add_filter( 'upgrader_clear_destination', array( $this, 'delete_old_plugin' ), 10, 4 );
wp-admin/includes/class-wp-upgrader.php 380
remove_filter( 'upgrader_clear_destination', array( $this, 'delete_old_plugin' ) );
wp-admin/includes/class-wp-upgrader.php 327
add_filter( 'upgrader_clear_destination', array( $this, 'delete_old_theme' ), 10, 4 );
wp-admin/includes/class-wp-upgrader.php 350
remove_filter( 'upgrader_clear_destination', array( $this, 'delete_old_theme' ) );
wp-admin/includes/class-wp-upgrader.php 399
add_filter( 'upgrader_clear_destination', array( $this, 'delete_old_theme' ), 10, 4 );
wp-admin/includes/class-wp-upgrader.php 492
remove_filter( 'upgrader_clear_destination', array( $this, 'delete_old_theme' ) );