Callback function for admin mass blocking users.
function user_user_operations_block($accounts) {
$accounts = user_load_multiple($accounts);
foreach ($accounts as $account) {
// Skip blocking user if they are already blocked.
if ($account !== FALSE && $account->status == 1) {
// For efficiency manually save the original account before applying any
// changes.
$account->original = clone $account;
$account->status = 0;
$account
->save();
}
}
}