简单PHP数组循环导致“递归”

我有一个非常奇怪的问题，当我使用for循环访问数组时，会导致同一对象被索引：

for ($g = $start_index; ($g < ($start_index + $groups_per_page)) && ($g < count($groups)); $g++) {
    dpm($g);
    dpm($groups);
    $group = $groups[$g];

    print $group->name;
}

如您所见，循环非常简单，dpm Drupal调试输出的输出为：

0
(see above)
Default Survival Language Group

然后：

如您所见，这通过为循环的两个迭代打印第一个组的名称来体现

---

有什么想法吗？

以前的$groups中的$groups有问题

0
(see above)
Default Survival Language Group

1
Array, 2 elements
    0 (object) stdClass
        last_date (String, 10 characters ) 1421335514
        sum_max_scores (String, 4 characters ) 3056
        assessment_count (String, 2 characters ) 37
        sum_max_scores_games (String, 3 characters ) 129
        passed_lesson_count (Float) 15
        sum_total_duration (String, 7 characters ) 1204553
        sum_total_duration_games (String, 7 characters ) 1007752
        first_date (String, 10 characters ) 1414158834
        sum_first_scores (String, 4 characters ) 2879
        id (String, 1 characters ) 1
        name (String, 32 characters ) Default Survival Language Group
        type (String, 2 characters ) sl
        can_add_content (String, 1 characters ) 1
        created (String, 1 characters ) 0
        teacher_id (String, 1 characters ) 1
        enabled (String, 1 characters ) 1
        lessons_in_group (Array, 199 elements)
        avg_first_scores (Float) 78
        avg_max_scores (Float) 83
        progress (Float) 5
    1 (object) stdClass
        Recursion
Default Survival Language Group