If else statement issue with PHP

Question

Ive been trying to put the following items into a If / Else statement with out much luck, anyone able to quickly point me in the right direction...

If ($link_image is active then display the code... )

            <div class="qodef-e-quote-image">
                <?php echo wp_get_attachment_image($link_image, 'full');  ?>
            </div> 

Else (display the following)

    <span class="qodef-e-icon"><?php echo webon_return_svg_link(); ?> 

Thanks!!!