我正在尝试对嵌套变量上的多数组进行排序。我的数据结构显示在显示的代码下方。我想对sortby变量进行排序。该代码在一个类中。排序功能和调用代码如下所示。我认为问题在于sort函数没有找到sortby变量，但是我不知道如何解决它。
private static function array_sort_by_column(&$arr, $col, $dir = SORT_ASC) {
$sort_col = array();
foreach ($arr as $key=> $row) {
$sort_col[$key] = $row[$col];
}
array_multisort($sort_col, $dir, $arr);
}
foreach ( $controls as &$ctrl ) {
foreach ( $ctrl as &$values ) {
$this->array_sort_by_column($values, 'sortby');
}
}
Array
(
[group1] => Array
(
[names] => Array
(
[0] => name_entry Object
(
[value] => "abc"
[sortby] => 11
)
[1] => control_value
)
[fontAwesome] => Array
(
[0] => fonts_entry Object
(
[value] => "abc"
[sortby] => 1
)
[1] => control_value
)
[styles] => Array
(
[0] => style_entry Object
(
[value] => "abc"
[sortby] => 111
)
[1] => control_value
)
[stylesAltA] => Array
(
[0] => stylesAltA_entry Object
(
[value] => "abc"
[sortby] => 21
)
[1] => control_value
)
[stylesAltB] => Array
(
[0] => stylesAltB_entry Object
(
[value] => "abc"
[sortby] => 33
)
[1] => control_value
)
)
[group2] => Array
(
[names] => Array
(
[0] => name_entry Object
(
[value] => "abc"
[sortby] => 15
)
[1] => control_value
)
[filters] => Array
(
[0] => filters_entry Object
(
[value] => "abc"
[sortby] => 17
)
[1] => control_value
)
)
[group3] => Array
(
[views] => Array
(
[0] => views_entry Object
(
[value] => "abc"
[sortby] => 9
)
[1] => control_value
)
)
)
如果我在sort函数中显示sort_col数组，它将显示以下内容
Array
(
[names] =>
[fontAwesome] =>
[styles] =>
[stylesAltA] =>
[stylesAltB] =>
[filters] =>
[views] =>
)
因此未设置值。那应该是每个对象中的[0]数组吗？任何人都可以告诉我问题出在哪里或者是否有更好的方法？