convert HTML/XHTML (of RTF Editor) format to XML style

Hi. all I want to convert the HTML output of the REF Editor to XML format. (Environment: PHP 7 or above) Therefore, the following assumptions were made: The PHP RTF Editor can be chosen from the following or any of the freely available ones. 1) TinyMCE 2) FCK Editor 3) Nicedit 4) or another products I will only use the following properties in the RTF Editor: 1) Only support Text (not need image) 2) Font name 3) Font Size 4) Font Color 5) bold, Italic, Underline 6) Alignment (left, center, right) 7) Transparent ** Therefore, Do not need images, prints, or indents attributes In general, the RTF Editor for PHP produces output in either HTML or XHTML. I don't need HTML/XHTML here. The goal is to parse the HTML to get the XML. (More rules are in the attached document.) Therefore, after creating a test button called [Save] and [Read], When you click the [Save] button.      Convert HTML/XHTML output from RTF Editor to XML format When you click the [Read] button      Convert the XML format into HTML/XHTML format and display it in the RTF Editor.