在 Foreach 中使用关联数组常量

Question

我在 PHP7 所以我使用 define() 将关联数组设置为常量，如

define('CONSTANT_ARRAY', [
    'December 2019' => '2020-01-01',
    'July 2019' => '2019-08-01',
    "May 2019" => "2019-06-01",
    "February 2019" => "2019-03-01",
    "July 2018" => "2018-08-01",
    "November 2017" => "2017-12-01",
    "October 2017" => "2017-11-01",
    "August 2017" => "2017-09-01",
    "July 2017" => "2017-08-01",
    "June 2017" => "2017-07-01",
    "May 2017" => "2017-06-01",
    "April 2017" => "2017-05-01",
    "March 2017" => "2017-04-01",
    "February 2017" => "2017-03-01"
]);

我想获取此常量以在 foreach 循环中使用。

foreach (explode(', ', CONSTANT_ARRAY) as $month => $actual_date) {
    // SOME CODE
} /* end foreach loop */

// SOME CODE TO FETCH AND DISPLAY THE RESULTS

发现什么问题了吗？

Answer 1

您的常量是一个数组，因此您可以以常规方式循环遍历它：

foreach (CONSTANT_ARRAY as $month => $actual_date) {
    // SOME CODE
} /* end foreach loop */

你不需要 serialize/unserialize 你的数组，因为 PHP 5.6+

在 Foreach 中使用关联数组常量

Using Associative Array Constants in Foreach

php

foreach

associative-array

constants