在PHP 5.2中将命名数组追加到数组的最佳方法 [英] best way append named array to array in PHP 5.2

问题描述

我习惯了这种表示法，用于创建空数组，并在需要时向其中添加命名元素；

I got used to this notation for creating empty arrays and add named elements to them when needed;

$array = [];

// in case there is an error
$array["error"][] = "new error message as element 0 of $array['error']";

现在我了解到，数组的[]表示法在旧版本的PHP(例如PHP 5.2)中不起作用.

Now I learned that the [] notation for arrays does not work in older versions of PHP, like PHP 5.2.

相反，我必须做；

$array = array(
  "error" => array()
);

array_push($array["error"], "new error message as element 0 of $array['error']");

在我的情况下，这种方式有点不方便，因为关于第一个代码段的妙处是，仅当发生实际错误时，才会在 $ array 中创建错误"条目，而在后一种情况下，该条目(尽管为空)以任何一种方式存在.

This way is a little bit inconvenient in my case because the great thing about the first code snippet is that the "error" entry in $array is only created when there is an actual error, whereas in the latter case the entry (although empty) exists either way.

是否有一种方法可以以类似的功能"(即在需要时指定/添加命名元素，而不是在初始化时添加)，并且在PHP 5.2中也易于理解?

Is there a way to get similar 'functionality' (i.e. specifying/adding named elements when needed, not at initialisation) in a way that is also easily readable in PHP 5.2?

推荐答案

原始文章中的第一个代码段是读取 $ array = array []; .我发布此答案后，作者对此进行了纠正.

The first code snippet in the original post was reading $array = array[];. The author corrected it after I posted this answer.

第一个被截断的代码不正确.没有 array [] 这样的东西.正确的语法是 array().

The first code snipped is incorrect. There is no such thing as array[]. The correct syntax is array().

$array = array();

// in case there is an error
$array["error"][] = "new error message as element 0 of $array['error']";

您不必担心PHP版本.自从PHP诞生以来，这种语法就一直在PHP上起作用，并且可能永远有效.继续使用它.

You don't have to worry about PHP versions. This syntax always worked on PHP since its dawn and it will probably work forever. Keep using it.

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