PHP数组重组？

Question

有这样一个数组:

$tags = [
    [
        "taxfree",
        "房本满五年"
    ],
    [
        "haskey",
        "随时看房"
    ]
];

如何将该数据改成如下结果？

$tags = ['taxfree' => "房本满五年", "haskey" => "随时看房"];

Answer 1

$ret = [];
$tags = [
    [
        "taxfree",
        "房本满五年"
    ],
    [
        "haskey",
        "随时看房"
    ]
];
foreach($tags as $tag) {
    $ret[$tag[0]] = $tag[1];
}

Answer 2

$new_arr=array_column($tags,0,1);

Answer 3

$tags = array_combine($tags[0], $tags[1]);