RSS get image from description using PHP [closed]

Really simple question, but I really don't know how to do:

RSS feed format

<item>
    <title></title>
    <link></link>
    <description><![CDATA[<p style="text-align: justify;"><span style="background-color: initial;"><img src="https://www.website.bg/images/bg/News/images/vhod_23.jpg" width="300" height="225" alt="vhod 23" style="margin: 0px 10px 0px 0px; float: left;" />Lorem ipsum dolor sit amet, consectetur adipiscing elit.</span></p>
]]></description>
    <pubDate></pubDate>
    <guid></guid>
    <dc:date></dc:date>
    </item>

Using the description, I want to echo only the image tag in my:

<div class="post-image">
    <img alt="Website" src="PLEASE, ECHO IMAGE HERE">
</div>

Thanks guys! <3