post-navに記事のタイトルを表示させたい

mh-functions.php

次の記事、過去の記事
の部分に、記事のタイトルを表示させたいのですが
方法が分かりません。
助けてください＞＜

/***** Post / Image Navigation *****/

if ($attachment && $count == 1) {
$permalink = get_permalink($parent_post);
echo ‘<nav class=”post-nav-wrap clearfix” role=”navigation”>’ . “\n”;
echo ‘<div class=”post-nav left”>’ . “\n”;
echo ‘‘ . __(‘← Back to article’, ‘mhp’) . ‘‘;
echo ‘</div>’ . “\n”;
echo ‘</nav>’ . “\n”;
} elseif (!$attachment || $attachment && $count > 1) {
echo ‘<nav class=”post-nav-wrap clearfix” role=”navigation”>’ . “\n”;
echo ‘<div class=”post-nav left”>’ . “\n”;
if ($attachment) {
previous_image_link(‘%link’, __(‘← Previous image’, ‘mhp’));
} else {
previous_post_link(‘%link’, __(‘← 過去の記事’, ‘mhp’));
}
echo ‘</div>’ . “\n”;
echo ‘<div class=”post-nav post-nav-next right”>’ . “\n”;
if ($attachment) {
next_image_link(‘%link’, __(‘Next image →’, ‘mhp’));
} else {
next_post_link(‘%link’, __(‘次の記事 →’, ‘mhp’));
}
echo ‘</div>’ . “\n”;
echo ‘</nav>’ . “\n”;