WordPress at a glance
filter is not described

send_password_change_email filter-hook . WP 4.3.0

Filters whether to send the password change email.

Usage

add_filter( 'send_password_change_email', 'filter_function_name_1705', 10, 3 );
function filter_function_name_1705( $send, $user, $userdata ){
	// filter...

	return $send;
}
$send(true/false)
Whether to send the email.
$user(array)
The original user array.
$userdata(array)
The updated user array.

Where the hook is called

wp_update_user()
wp-includes/user.php 1848
$send_password_change_email = apply_filters( 'send_password_change_email', true, $user, $userdata );

Where the hook is used (in WP core)

Does not used.