【コピペOK】ブログカードとは？おしゃれなブログカードの作り方3選【プラグインなし・あり】

//ブログカード用コード
// 記事IDを指定してdescriptionを取得
function ltl_get_the_excerpt($post_id){
global $post;
$post_bu = $post;
$post = get_post($post_id);
setup_postdata($post_id);
$output = get_post_custom($post_id)['_aioseo_description'][0];//AllinOneSEOの場合
$post = $post_bu;
return $output;
}

//ショートコード
function nlink_scode($atts) {
extract(shortcode_atts(array(
'url'=>"",
'title'=>"",
'excerpt'=>""
),$atts));

$id = url_to_postid($url);//URLから記事IDを取得

$no_image = '';//アイキャッチ画像がない記事に使う画像URL

//記事タイトルを取得
if(empty($title)){
$title = esc_html(get_the_title($id));
}
//descriptionを取得
if(empty($excerpt)){
$excerpt = esc_html(ltl_get_the_excerpt($id));
}

//アイキャッチ画像を取得
if(has_post_thumbnail($id)) {
$img = wp_get_attachment_image_src(get_post_thumbnail_id($id),'medium');
$img_tag = "<img src='" . $img[0] . "' alt='{$title}'/>";
}else{
$img_tag ='<img src="'.$no_image.'" alt="" width="'.$img_width.'" height="'.$img_height.'" />';
}

$nlink .=' <div>
<a class="card-link longcard-link" href="'. $url .'" title="'.$title.'" target="_blank" rel="noopener">
<span class="longcard-img">'. $img_tag .'</span>
<span class="blogcard-content blogcard-text">
<span class="blogcard-title">'. $title .' </span>
<span class="blog-card-excerpt-long">'. $excerpt .'</span>
</span></a></div>';

return $nlink;
}

add_shortcode("nlink", "nlink_scode");

$output = get_post_custom()['_aioseo_description'][0];//AllinOneSEOの場合

//AllinOneSEOを使っている場合：そのままでOK
$output = get_post_custom()['_aioseo_description'][0];//AllinOneSEOの場合

//YoastSEOを使っている場合：上記のコードを以下のコードに変更する
$output = get_post_meta($post_id,'_yoast_wpseo_metadesc',true);//YoastSEOの場合

//どっちも使っていない場合：上記のコードを以下のコードに変更する
$output = get_the_excerpt();

/* ブログカード シンプルデザイン*/
.blog-card-long {
	margin: 0 0 1.8rem;
}
.card-link {
  display: block;
  overflow: hidden;
  max-width: 400px;
  width: 100%;
  padding: 0;
  border-radius: 3px;
  background: #fff;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.25);
  color: #555;
  font-weight: bold;
  text-decoration: none !important;
  position: relative;
}
.card-link:hover {
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.25);
  color: #888;
  text-decoration: none;
  transform: translateY(-2px);
}
.blog-card-label-long{
	z-index: 1;
	display: inline-block;
    position: absolute;
	background-color: #f99f48;
    top: 10px;
	left: 10px;
	max-width: 120px;
	height: 25px;
	padding: 0 0.5rem;
    color: #fff;
    font-size: .8rem;
    font-weight: 700;
    text-align: center;
    line-height: 25px;
    transform-origin: 50% 50%;
    animation: animScale 3.5s ease-out;
}

.card-link .blogcard-text {
  display: block;
  padding: 15px 13px;
  line-height: 1.6;
}
.card-link img {
  width: 100%;
}
.longcard-link {
  margin-bottom: 1.5em;
  box-shadow: 0 1px 5px 0 rgba(0, 0, 0, 0.25);
}
.longcard-link img {
  padding: 10px 10px 0;
}
.longcard-img{
	position: relative;
}
.blogcard-title {
	font-size: 1em;
	font-weight: bold;
	line-height: 1.4;
	display: -webkit-box;
    -webkit-box-orient: vertical;
	-webkit-line-clamp: 3;
    overflow: hidden;
    text-overflow: ellipsis;
}
.blog-card-excerpt-long {
	padding-top: .8em;
    font-size: .8em;
    line-height: 1.4;
	font-weight: normal;
    opacity: .8;
	color: #333;
	display: -webkit-box;
	-webkit-box-orient: vertical;
	-webkit-line-clamp: 2;
	overflow: hidden;
    text-overflow: ellipsis;
}
@media only screen and (min-width: 481px) {
	.card-link {
    	display: inline-block;
    	max-width: 310px;
    	margin-right: 20px;
 	}
	.longcard-link {
    	max-width: 100%;
    	display: table;
  	}
  	.longcard-img,
  	.card-link.longcard-link .blogcard-content {
    display: table-cell;
    vertical-align: middle;
  }
  .longcard-img {
    width: 40%;
  }
  .blogcard-content {
    width: 60%;
  }
  .longcard-img img {
    width: 100%;
    padding: 10px;
  }
}
@media screen and (max-width: 959px){
	.blog-card-excerpt-long {
		display: none;
	}
}

/* ブログカード ポップなデザイン*/
.blog-card-long {
	margin: 0 0 1.8rem;
}
.card-link {
  display: block;
  overflow: hidden;
  max-width: 400px;
  width: 100%;
  padding: 0;
  border-radius: 9px;
  border:3px solid #ffb36b;
  background-color: #fffbf5;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.25);
  color: #555;
  font-weight: bold;
  text-decoration: none !important;
  position: relative;
}
.card-link:hover {
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.25);
  color: #888;
  text-decoration: none;
  transform: translateY(-2px);
}
.blog-card-label-long{
	z-index: 1;
	display: inline-block;
    position: absolute;
	background-color: #f99f48;
    top: 10px;
	left: 10px;
	max-width: 120px;
	height: 25px;
	padding: 0 0.5rem;
    color: #fff;
    font-size: .8rem;
    font-weight: 700;
    text-align: center;
    line-height: 25px;
    transform-origin: 50% 50%;
    animation: animScale 3.5s ease-out;
}

.card-link .blogcard-text {
  display: block;
  padding: 15px 13px;
  line-height: 1.6;
}
.card-link img {
  width: 100%;
}
.longcard-link {
  margin-bottom: 1.5em;
  box-shadow: 0 1px 5px 0 rgba(0, 0, 0, 0.25);
}
.longcard-link img {
  padding: 10px 10px 0;
}
.longcard-img{
	position: relative;
}
.blogcard-title {
  color:#337ab7;
	font-size: 1.2em;
	font-weight: bold;
	line-height: 1.4;
	display: -webkit-box;
    -webkit-box-orient: vertical;
	-webkit-line-clamp: 3;
    overflow: hidden;
    text-overflow: ellipsis;
}
.blog-card-excerpt-long {
	padding-top: .8em;
    font-size: .8em;
    line-height: 1.4;
	font-weight: normal;
    opacity: .8;
	color: #333;
	display: -webkit-box;
	-webkit-box-orient: vertical;
	-webkit-line-clamp: 2;
	overflow: hidden;
    text-overflow: ellipsis;
}
@media only screen and (min-width: 481px) {
	.card-link {
    	display: inline-block;
    	max-width: 310px;
    	margin-right: 20px;
 	}
	.longcard-link {
    	max-width: 100%;
    	display: table;
  	}
  	.longcard-img,
  	.card-link.longcard-link .blogcard-content {
    display: table-cell;
    vertical-align: middle;
  }
  .longcard-img {
    width: 40%;
  }
  .blogcard-content {
    width: 60%;
  }
  .longcard-img img {
    width: 100%;
    padding: 10px;
  }
}
@media screen and (max-width: 959px){
	.blog-card-excerpt-long {
		display: none;
	}
}

<div class="blog-card-label">関連記事</div>

/*ブログカードのラベル*/
.blog-card-label{
    display: inline-block;
    position: absolute;
    background-color: #ffb36b;
    top: 0px;
    left: 0px;
	z-index: 2;
    width: 70px;
    height: 25px;
    color: #fff;
    font-size: .8rem;
    font-weight: 700;
    text-align: center;
    line-height: 25px;
    transform-origin: 50% 50%;
    animation: animScale 3.5s ease-out;
}