Echo a variable's value inside a variable? : I need to echo the value of $sourceName. 

Searched a lot and tried this way but didn't work for me:

    $sourceName = '<p class="description">123'.$query.'</p class="description">';
    <?php
    echo '<div id="listings" class="listings">
                    
                    <strong></strong> '.$$sourceName.'
                  </div>';

It can't get $query value and the code only echos: "123"