Php 由逗号分隔字符串生成的多维数组

我正在尝试将一个逗号转换成一个多维数组来创建这个数组的菜单结构

这就是我已经拥有的

        for ($i=0; $i < $count; $i++) {
                if($i > 0){
                    array_push($tagmenu[0][$pretags[$i-1]], array($pretags[$i]=>array()));
                } else {
                    array_push($tagmenu, array($pretags[$i]=>array()));
                }

            }

我希望它看起来像这样

Array(
      [images] = Array (
                 [landscape] = Array(
                               [night] = Array ()
                 )
      )

我正在搜这个

可能的副本

$tags = 'image,landscape,night';
$newArray = array();
$wrkArray = &$newArray;

foreach(explode(',',$tags) as $tag) {
    $wrkArray[$tag] = array();
    $wrkArray = &$wrkArray[$tag];
}
unset($wrkArray);
var_dump($newArray);

$tags = 'image,landscape,night';
$newArray = array();
$wrkArray = &$newArray;

foreach(explode(',',$tags) as $tag) {
    $wrkArray[$tag] = array();
    $wrkArray = &$wrkArray[$tag];
}
unset($wrkArray);
var_dump($newArray);