例如：

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$a = array("a","b","c","d");
转换成 $b["a"]["b"]["c"]["d"] = "VaneHay";

代码

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$a = $b = ['a','b','c','d'];
$w = []; //最后输出值
$l = null;
while($l=array_pop($a)){
    $c = end($b);
    if($l == $c){
        $w = [
            $c=>'VaneHay'
        ];
    }else{
        $w = [
            $l=>$w
        ];
    }
    if(count($a) <= 0) {
        break;
    }
}

效果

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Array
(
    [a] => Array
        (
            [b] => Array
                (
                    [c] => Array
                        (
                            [d] => VaneHay
                        )

                )

        )

)