Pull Request for Issue # : None, found and fixed it directly here.

Summary of Changes

This is the Joomla 4.0 identical pendent of this Joomla 3.10 PR #36804 that got merged.

In PHP, htmlentities() has following parameters types: 2nd is a non-null int, 4th is à non-null bool.

 htmlentities(
    string $string,
    int $flags = ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML401,
    ?string $encoding = null,
    bool $double_encode = true
): string

ref.: https://www.php.net/manual/en/function.htmlentities.php

This PR does replace null by their type-conversions: (int) null -> 0, and (bool) null -> false.

Disclaimer: I'm only fixing PHP 8.1 compatibility here.

Testing Instructions

A code-review should be enough here.

I found it with CB internal PMS / New Message, but I guess PHP 8.1 on any tinymce window should show it too.

Actual result BEFORE applying this Pull Request

• Deprecated: htmlentities(): Passing null to parameter # 2 ($flags) of type int is deprecated in /home/beat/www/4.0/plugins/editors/tinymce/tinymce.php on line 538
• Deprecated: htmlentities(): Passing null to parameter # 4 ($double_encode) of type bool is deprecated in /home/beat/www/4.0/plugins/editors/tinymce/tinymce.php on line 538

Expected result AFTER applying this Pull Request

No errors.

Documentation Changes Required

None.