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php - Set and merge 'in-place': could it cause problems?

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I have a static member variable and I set its values like so:

    private static $HTML_FILTER = [
        'div' => ['aria' => 1]
    ];

    public function __construct($allowed_html) {
        // Is the below dangerous?
        MyClass::$HTML_FILTER = array_merge_recursive(allowed_html, MyClass::$HTML_FILTER);

        // Should I instead do
        $temp = array_merge_recursive(allowed_html, MyClass::$HTML_FILTER);
        MyClass::$HTML_FILTER = $temp;
    }
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Essentially I am interrogating a static array right before I (over)write it. Would this cause issues on certain versions of PHP or all?

Undefined asked

2021-12-1

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2021-12-1

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PHP

PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites. The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/

HTML

HTML (English "hyper text markup language" - hypertext markup language) is a special markup language that is used to create sites on the Internet. Browsers understand html perfectly and can interpret it in an understandable way. In general, any page on the site is html-code, which the browser translates into a user-friendly form. By the way, the code of any page is available to everyone.
https://www.w3.org/html/