upgrader_pre_install filter-hook . WP 2.8.0

Filters the install response before the installation has started.

Returning a truthy value, or one that could be evaluated as a WP_Error will effectively short-circuit the installation, returning that value instead.

Usage

add_filter( 'upgrader_pre_install', 'filter_function_name_4730', 10, 2 );
function filter_function_name_4730( $response, $hook_extra ){
	// filter...

	return $response;
}

$response(true/false/WP_Error)

Response.

$hook_extra(array)

Extra arguments passed to hooked filters.

Where the hook is called

$res = apply_filters( 'upgrader_pre_install', true, $args['hook_extra'] );

Where the hook is used (in WP core)

add_filter('upgrader_pre_install', array($this, 'current_before'), 10, 2);

remove_filter('upgrader_pre_install', array($this, 'current_before'));

add_filter('upgrader_pre_install', array($this, 'current_before'), 10, 2);

remove_filter('upgrader_pre_install', array($this, 'current_before'));

add_filter('upgrader_pre_install', array($this, 'deactivate_plugin_before_upgrade'), 10, 2);

remove_filter('upgrader_pre_install', array($this, 'deactivate_plugin_before_upgrade'));