What are the advantages and disadvantages of using proportional fonts in PHP for displaying text content on a webpage?

When displaying text content on a webpage using PHP, using proportional fonts can make the text more visually appealing and easier to read. However, proportional fonts can also make the layout less consistent and may cause alignment issues with certain elements on the page.

<p style="font-family: Arial, sans-serif;">This is an example text using a proportional font.</p>