如何使用PHP在循环中向数组添加元素 [英] how to add elements to an array in a loop using php

问题描述

我正在动态尝试填充多维数组并遇到一些麻烦.

I am dynamically trying to populate a multidimensional array and having some trouble.

我有美国各州的清单.在我的循环中，像这样的关联数组$ states [nc]，$ states [sc]等，我想将城市附加到每个州，因此$ states [nc] [cities]包含一个城市数组.我坚持逻辑.

I have a list of US states. Associative array like this $states[nc], $states[sc], etc. in my loop I want to append cities onto each state so $states[nc][cities] contains an array of cities. Im stuck with the logic.

foreach($states as $state) {
    $data[$state] = $state;

    foreach($cities as $city) {
      $data[$state]['cities'] .= $city;
     }
}

我知道串联是不正确的，但是我不确定如何向该数组添加元素.我不断收到关于array_push的错误.

I know that concatenation is not correct, but I am not sure how to add elements to this array. I keep getting errors with array_push.

添加这些元素的正确方法是什么?

What's the correct way to add these elements?

推荐答案

与键无关时添加到数组的方法相同:

The same way you add to an array when the key is not a concern:

$data[$state]['cities'][] = $city;

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