class.ilAssQuestionAssignedSkillList.php

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<?php

class ilAssQuestionAssignedSkillList implements Iterator
{
    protected array $skills = [];

    public function addSkill(int $skill_base_id, int $skill_ref_id): void
    {
        $this->skills[] = "{$skill_base_id}:{$skill_ref_id}";
    }

    public function skillsExist(): bool
    {
        return (bool) count($this->skills);
    }

    public function current(): ?string
    {
        $current = current($this->skills);
        return $current !== false ? $current : null;
    }

    public function next(): void
    {
        next($this->skills);
    }

    public function key(): ?int
    {
        return key($this->skills);
    }

    public function valid(): bool
    {
        $res = key($this->skills);
        return $res !== null;
    }

    public function rewind(): void
    {
        reset($this->skills);
    }

    public function sleep(): array
    {
        return ['skills'];
    }

    public function wakeup(): void
    {
        // TODO: Implement __wakeup() method.
    }
}