SystemMessagesService.php

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<?php
namespace Elgg;

class SystemMessagesService {

    protected $session;

    public function __construct(\ElggSession $session) {
        $this->session = $session;
    }

    function dumpRegister($name = '') {
        $registers = $this->loadRegisters($name);

        if ($name !== "") {
            $return = array();
            $return[$name] = empty($registers[$name]) ? [] : $registers[$name];
            unset($registers[$name]);
        } else {
            $return = $registers;
            $registers = array();
        }

        $this->saveRegisters($registers);
        return $return;
    }

    function count($register_name = "") {
        $registers = $this->loadRegisters($register_name);

        if ($register_name !== '') {
            return empty($registers[$register_name]) ? 0 : count($registers[$register_name]);
        }

        $count = 0;
        foreach ($registers as $register) {
            $count += count($register);
        }
        return $count;
    }

    function addSuccessMessage($message) {
        return $this->addMessageToRegister($message, "success");
    }

    function addErrorMessage($error) {
        return $this->addMessageToRegister($error, "error");
    }

    function addMessageToRegister($message, $register_name = '') {
        $registers = $this->loadRegisters($register_name);

        if (is_string($message)) {
            $message = array($message);
        }
        if (!isset($registers[$register_name])) {
            $registers[$register_name] = [];
        }
        $registers[$register_name] = array_merge($registers[$register_name], $message);

        $this->saveRegisters($registers);
        return true;
    }

    protected function loadRegisters($accessed_register = '') {
        $registers = $this->session->get('msg', array());

        if (!isset($registers[$accessed_register]) && $accessed_register !== '') {
            $registers[$accessed_register] = array();
        }

        return $registers;
    }

    protected function saveRegisters(array $registers) {
        $this->session->set('msg', $registers);
    }
}