来自MySQL查询的多个嵌套数组

Question

我使用foreach循环来访问嵌套数组中的记录：

while ($row = mysql_fetch_assoc($result)){  
    $test_groups[$row['group_name']][] = $row['lab_test'];
  }

  foreach($test_groups as $group_name => $tests){
    echo "<tr><td><span class='test_group_name'>" . $group_name . "</span></td></tr>";
    foreach($tests as $test){
        echo "<tr><td>" . $test . "</td></tr>";
    }
    echo "<tr><td>&nbsp;</td></tr>";
}
echo '</table>';

这很好用。现在我需要为嵌套数组添加另一个级别，如：

$departments[$row['department_name']][$row['group_name']][] = $row['lab_test'];

这会起作用，我应该如何调整上面的每个循环来满足这个要求？

Answer 1

分配给数组的最后应为[]

$departments[$row['department_name']][$row['group_name']][] = $row['lab_test'];

Foreach循环将是：

foreach ($departments as $dep_name => $groups) {
    echo $dep_name;

    foreach ($groups as $group_name => $tests) {
        echo $group_name;

        foreach ($tests as $test) {
            echo $test;
        }
    }  
}

只需使用echo es，根据需要制作HTML。