class.ilUserClipboard.php

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<?php

class ilUserClipboard
{
    public const SESSION_KEYWORD = 'usr_clipboard';
    private static ?ilUserClipboard $instance = null;
    private array $clipboard = []; // Missing array type.

    protected function __construct(int $a_user_id)
    {
        $this->read();
    }

    public static function getInstance(int $a_usr_id): self
    {
        if (!self::$instance) {
            self::$instance = new self($a_usr_id);
        }
        return self::$instance;
    }

    public function hasContent(): bool
    {
        return (bool) count($this->clipboard);
    }

    public function get(): array // Missing array type.
    {
        return $this->clipboard;
    }

    public function getValidatedContent(): array // Missing array type.
    {
        $valid = [];
        foreach ($this->clipboard as $usr_id) {
            if (strlen(ilObjUser::_lookupLogin($usr_id))) {
                $valid[] = $usr_id;
            }
        }
        return $valid;
    }

    public function add(array $a_usr_ids): void // Missing array type.
    {
        $this->clipboard = array_unique(array_merge($this->clipboard, $a_usr_ids));
    }

    public function delete(array $a_usr_ids): void // Missing array type.
    {
        $remaining = [];
        foreach ($this->get() as $usr_id) {
            if (!in_array($usr_id, $a_usr_ids)) {
                $remaining[] = $usr_id;
            }
        }
        $this->replace($remaining);
    }

    public function replace(array $a_usr_ids): void // Missing array type.
    {
        $this->clipboard = $a_usr_ids;
    }

    public function clear(): void
    {
        $this->clipboard = [];
    }

    public function save(): void
    {
        ilSession::set(self::SESSION_KEYWORD, $this->clipboard);
    }

    protected function read(): void
    {
        $this->clipboard = (array) ilSession::get(self::SESSION_KEYWORD);
    }
}