Question

我正在使用PHP，我正在使用此处列出的数组： https://gist.github.com/aghouseh/3926213

所以基本上它是一个带有州名的数组，在这些州名中是一个县的列表，如下所示：

$counties = array(
"Alabama" => array(
    "Autauga County",
    "Baldwin County",
    "Barbour County",
    "Bibb County")
"California => array(
    "Los angeles County",
    "San francisco county"));

基本上我想要完成的是：

$counties = array(
"Alabama" => array(
    "Autauga County" => "Autauga County",
    "Baldwin County" => "Baldwin County",
    "Barbour County" => "Barbour County",
    "Bibb County" => "Bibb County")
"California => array(
    "Los angeles County" => "Los angeles County",
    "San francisco county" => "San francisco county"));

我想把第二级数组变成一个关联数组。我试图寻找答案，我想出了这个，但没有奏效：

foreach ($counties as $state) {
        foreach ($state as $county) {
            array_combine($county, $county);
        }
    }

Answer 1

根据需要创建一个新数组，并用它替换原始数据：

foreach ($counties as $state => $x) {
    $c = array();
    foreach ($x as $county) {
        $c[$county] = $county;
    }
    $counties[$state] = $c;
}

Answer 2

实际上array_combine将是一种优雅而优雅的方式。如果只有你在正确的水平使用它并将其结果存储在某个地方！请注意，array_combine在原始数组上不能通过引用工作。它返回结果。使用此：

foreach($counties as &$states) {
    $states = array_combine($states, $states);
}

这就是完成这项工作所需的所有代码。

将一组简单数组转换为一个关联数组数组？

2 个答案: