Images
<?php
    $dir = '/usr/share/nginx/html';
    $files = scandir($dir);
    $ext = '.png';
    foreach ($files as $img) {
        if ( substr_compare($img, $ext, -strlen($ext), strlen($ext)) === 0 ) {
            ?>
                <h2 style="font-family: monospace;"><?=$img?></h2>
                </div>
            <?
        }
    }
?>