Chris

Related YouTube Videos is a free WordPress plugin that embeds a number of, well, YouTube videos that are related to your content. The list is put together by using the YouTube search API. And you can specify the relation between the videos and your content by:
<ul>
<li>the title of your current post, page or custom post type.</li>
<li>the tags of your current post, page or custom post type.</li>
<li>the categories of your current post, page or custom post type.</li>
<li>any keywords you specify.</li>
</ul>
Also, this plugin offers you two ways to embed related videos:
<ol>
<li>by using the shortcode [relatedYouTubeVideos] somewhere in your post/page content.</li>
<li>by using the WordPress widget “Related YouTube Videos” in any of your widget areas (multiple instances are possible).</li>
</ol>
<h4>Disclaimer / Important</h4>
As of April 2015 the YouTube API can only be accessed when you have a valid key for the data API. Also, the number of free requests per day is limited!
There is a nice and short video tutorial (https://www.youtube.com/watch?v=zOYW7FO9rzA) on how to get such an API key. But it’s up to you to make sure your stay within the free limit or keep track of the costs when you need more than that!
Please read Youtube and Google’s terms and conditions for more details.
<h4>The Shortcode</h4>
I’m only going to explain the options/paramters for the shortcode but they work exactly the same for the widget, of course.
You can put the shortcode [relatedYouTubeVideos] anywhere you want inside the content of a page, post, or custom post type – as long as your WordPress theme is supporting shortcodes.
You can use the following options/parameters/attributes:
Appearance
<ul>
<li>id – You can specify the HTML id attribute for the wrapping <code><ul></code> element.</li>
<li>class – You can specify an additional HTML class name for the wrapping <code><ul></code> element</li>
<li>width – Width of the HTML video object</li>
<li>height – Height of the HTML video object</li>
<li>preview – “true” will only display the preview image and only load the video (via Javascript!) when this image has been clicked.</li>
<li>showVideoTitle – “true” if you want to show the video title right below the video itself. Can be styled via CSS class <code>.title</code></li>
<li>showVideoDescription – “true” if you want to show the video description below the video, respectively, when the video title is displayed right below the title. Can be styled via CSS class <code>.description</code> </li>
<li>autoplay – “true” if you want the video to automatically start playing when ready. This will obviously not work in preview mode!!</li>
<li>exclude – Comma separated list of post/page IDs where no videos shall be displayed.</li>
</ul>
Configuration
<ul>
<li>max – Number of videos (or search results) that will be returned. Can be any number between 1 and 10!</li>
<li>random – Select MAX number of videos out of RANDOM number of videos.</li>
<li>offset – START and OFFSET are interchangably the same and just other words for the same option.</li>
</ul>
YouTube
<ul>
<li>relation – Specify the kind of relation that shall be used for searching YouTube. Can either be ‘postTitle’, ‘postTags’, ‘postCategories’, or ‘keywords’ (in which case the attribute ‘terms’ will be used for the YouTube search).</li>
<li>terms – Search YouTube for these terms – no separating commas required.</li>
<li>exact – Set to ‘true’ will (try to) search for the exact phrase.</li>
<li>orderBy – Can either be ‘published’, ‘rating’, ‘viewCount’, (default) ‘relevance’.</li>
<li>lang – {2-letter-language-code} will show videos in that language.</li>
<li>region – {2-letter-country-code} will show videos that are actually viewable in that region/country.</li>
<li>author – Only show videos from a given YouTube User(name) .</li>
<li>filter – Add additional keywords or filtering search parameters. Those will always be added even when the relation is set to post title, tags, or so. You can also manually add post tags by adding ‘+postTags’, categories by adding ‘+postCategories’, the post title by adding ‘+postTitle’, post meta data by adding ‘+postMeta:key’ to the filter.</li>
<li>viewRelated – set to “no” or “false” will not show more related videos at the end of a clip.</li>
</ul>
I recommend always using the attributes ‘relation’, ‘max’, and if the relation shall be ‘keywords’ the ‘terms’ attribute. Depending on your design you might also set a custom width and height for the videos so they fit in properly.
Shortcode Example 1: [relatedYouTubeVideos relation=”postTags” max=”3″] Will show three videos coming back from the search YouTube for (all!) the tags you have assigned to this post or page.
Shortcode Example 2: [relatedYouTubeVideos relation=”keywords” terms=”monty python” max=”5″] Will show five Monty Python videos from YouTube.
Shortcode Example 3: [relatedYouTubeVideos relation=”keywords” terms=”real madrid” exact=”true” max=”2″] Will search for the exact phrase “Real Madrid” and (hopefully) not just anything “real”.
Shortcode Example 4: [relatedYouTubeVideos relation=”postTitle” max=”1″ orderBy=”viewCount” start=”1″] Will show the second most popular video (the first being skipped) relating to your post or page title.
Shortcode Example 5: [relatedYouTubeVideos relation=”keywords” terms=”monthy python” max=”1″ showVideoTitle=”true” showVideoDescription=”true”] Will show a Monty Python video, followed by the video title, followed by the video, followed by the video description.
Shortcode Example 6: [relatedYouTubeVideos relation=”keywords” terms=”monthy python” max=”1″ preview=”true”] Will show the thumbnail of a Monty Python video and load + play the video only when it’s being clicked.
Shortcode Example 7: [relatedYouTubeVideos relation=”postTitle” filter=”intitle:official -intitle:cover” max=”1″ preview=”true”] If the post title is about a music video (band and song title, for example) this will only show the official music video.
Shortcode Example 8: [relatedYouTubeVideos relation=”postTitle” filter=”+postCategories” max=”1″ preview=”true”] Will use the post title and a list of all categories the post is in to search YT.
<h4>The Widget</h4>
The widget almost works the same way. Or at least it has the same options for configuring the video request. If you log into your WordPress backend and go to the “Appearance > Widget” menu (given that your theme supports widgets) you can drag&drop a widget instance into the widget area of your choice.
The relatedYouTubeVideos widget allows multiple instances. So you can put as many widgets as you like into as many widget areas as you like.
The difference between the widget and the shortcode is not in terms of functionality but usually in the context they reside. Widgets usually go into sidebars or footers and alike and the same widget usually shows up for many, if not all pages, just the same. Shortcodes are placed inside the actual content and therefore will only show up when the page or post where they’re put is shown.
There is one functionality that only applies to widgets: In the options field “Hide on” you can set a list of comma separated, numerical post IDs on which the widget will not show up. This way you can easily exlude the widget on certain post. You can also use PAGE ids for that matter, since under the hood WordPress manages all “post type” IDs the same.
<h4>Randomize Results</h4>
The same keywords (or post title/tags) will ususally return the same video(s) for a period of time. Basically, that’s up to YouTube but in can take days, weeks or even months until fresh videos will show up.
When you set a numeric value for the RANDOM parameter/option you can get random videos from a pool of results. The MAX value plays along with the RANDOM value and both read like this: Show me {MAX} random videos out of {RANDOM} videos.
[relatedYouTubeVideos relation=”keywords” terms=”fast cars” max=”2″ random=”10″] will actually request 10 videos from YouTube but only show 2 random ones out of that 10.
So RANDOM will determine the size of the pool MAX videos will be chosen from.
<h4>System Requirements</h4>
In order to run this plugin you need the following components installed and enabled in your server and PHP environment:
<ul>
<li>PHP 5.1.2+</li>
<li>SimpleXML (usually is enabled by default anyways)</li>
<li>cURL (preferred) or fopen/fsockopen</li>
<li>OpenSSL + HTTPS wrapper (is only required if cURL is not available)</li>
<li>WordPress 3.0+</li>
</ul>
In general you should not have to worry about these things since they’re included in most web hosting packages nowadays. 
But to be sure you can download and install this plugin and then check the backend page. There is a “System Requirements” section that will show you exactly if you can good to go or if there is any problem.
In case you’re getting a “URL file-access is disabled in the server configuration” error you should make sure your PHP.ini file contains these two lines:
allow_url_include = on
allow_url_fopen = on
<h4>Available Languages:</h4>
<ul>
<li>English</li>
<li>German</li>
<li>
Serbo-Croatian – by Borisa Djuraskovic (<a href="http://www.webhostinghub.com/" rel="nofollow ugc">Webhostinghub</a>) 
Developers can also use the API class outside the plugin context, for example in a theme template file. All you have to do is include the class (if it doesn’t already exist) and create an object like this:
/* Load the “Related YouTube Videos” API class if it does not exist yet. */ 
if( !class_exists( ‘RelatedYouTubeVideos_API’ ) ) {
$file = str_replace( ‘/’, DIRECTORY_SEPARATOR, ABSPATH ) . ‘lib’ . DIRECTORY_SEPARATOR . ‘RelatedYouTubeVidoes’ . DIRECTORY_SEPARATOR . ‘API.php’;
if( file_exists( $file ) ) {
<pre><code>include_once $file;
</code></pre>
}
} 
/* Only continue if the API class could be loaded properly. */ 
if( class_exists( ‘RelatedYouTubeVideos_API’ ) ) {
$RytvAPI = new RelatedYouTubeVideos_API();
/* Do your configuration */ 
 $data = $RytvAPI->validateConfiguration( 
 array( 
 ‘relation’ => ‘postTitle’, 
 ‘max’ => ‘3’, 
 ‘width’ => 150, 
 ‘height’ => 150, 
 ‘lang’ => ‘en’, 
 ‘region’ => ‘de’, 
 ‘class’ => ‘left center inline bg-black’, 
 ‘preview’ => true 
 ) 
 );
/* Search YouTube. */ 
 $results = $RytvAPI->searchYouTube( $data );
/* Generate the unordered HTML list of videos according to the YouTube results and your configuration. */ 
 $html = $RytvAPI->displayResults( $results, $data );
echo $html; // Or do with it whatever you like 😉
}
</li>
</ul>

WPClever

Promoting related products, upsells, or cross-sells are among the most effective and common ways to encourage buyers to find out more choices and close the deal with a higher amount than their original intentions. WPC Smart Linked Products plugin is such a useful plugin to help store owners suggest more good items to buyers, which acts as a smart sale promoter for any online businesses.
Combining with the <a href="https://wordpress.org/plugins/wpc-custom-related-products/" rel="ugc">WPC Custom Related Products</a> plugin, which is specialized in dealing with related products, WPC Smart Linked Products will lay everything on the table for customers to easily make comparisons, analyze the needs & budgets, and decide faster. This makes people either end up purchasing an upsell version or upgrading their order value with related products & cross-sell products. Even when they decide to go back to their first choice, they have stayed on your site longer. Eventually, the sale revenue can see great improvements while more products are being paid attention.
Worth mentioning is, this plugin is so versatile and powerful that users can define the sources for the main product & applicable linked products in abundant ways: storewide products, selected items, product types, tags, categories, attributes, etc. Users can also limit the number of linked products and order them to show the priority choice. It’s now saving you more time and effort when configuring upsells & cross-sells with the comprehensive list of sources and rules at hands.
<h4>Benefits</h4>
<ul>
<li>Increase sale revenue vertically and/or horizontally</li>
<li>Get more attention to more product lines & deals</li>
<li>Convert more visitors into customers with ease</li>
<li>Build better product and brand awareness</li>
</ul>
<h4>Key Features</h4>
<ul>
<li>Promote custom linked products (upsells, cross-sells) & related products</li>
<li>Automatically generate custom linked products for bulk items</li>
<li>Multiple sources: all products, products, brands, collections, types, visibility, tags, categories, attributes, shipping classes</li>
<li>Creating rules for the display: item limit, product filters: order by & order</li>
<li>Multiple rules can be set for the same item: rules’ order matters</li>
<li>Compatible with <a href="https://wordpress.org/plugins/wpc-custom-related-products/" rel="ugc">WPC Custom Related Products for WooCommerce</a></li>
<li>Compatible with most common WordPress themes and WooCommerce add-ons</li>
<li>Premium: Combine different sources to define the main & linked products</li>
</ul>
<h4>Distinguish between Related Products, Upsells & Cross-sells</h4>
Related products are displayed on the single product page where, in most cases, written “Related products” to promote products that share the same tags or categories with the main item that is being viewed.
Upsells are products that come in a higher, better version than the one being viewed. Upsells are often considered the “upgraded” version of the current one with better quality and a higher price. When placed together, customers might end up comparing and choosing to buy a more expensive item.
Cross-sells are complementary products that are often bought with or can go well with the main item. Customers can choose to purchase a combo of items to enjoy the discount or get better suggestions of what will come in handy when they purchase more items. Cross-sell products are displayed on the mini-cart and cart page to remind buyers of what they might have forgotten to get.
If you use the WPC Custom Related Products plugin, you can find the Related products tab on the single product page to customize the item list. Linked products can be found on the Linked products tab. The global rules can be configured from under the WPClever menu.
<h4>Which to use?</h4>
When you need to automatically create related products from items that share the same tags or categories or define a hand-picked list of choices, you can use the WPC Custom Related Products plugin.
When you need to take it to a higher level by suggesting more discounts when people purchase the related products alongside the main one, you can use the WPC Frequently Bought Together plugin and make related products the default products for a Bought Together deal.
When you need to create a custom list of upsells or cross-sells and attach to different products at the same time in bulk, you can use this WPC Smart Linked Products plugin to deal with that.
<h4>Need more features?</h4>
Please try other plugins from us:
<ul>
<li><a href="https://wordpress.org/plugins/woo-smart-compare/" title="WPC Smart Compare" rel="ugc">WPC Smart Compare</a></li>
<li><a href="https://wordpress.org/plugins/woo-smart-quick-view/" title="WPC Smart Quick View" rel="ugc">WPC Smart Quick View</a></li>
<li><a href="https://wordpress.org/plugins/woo-smart-wishlist/" title="WPC Smart Wishlist" rel="ugc">WPC Smart Wishlist</a></li>
<li><a href="https://wordpress.org/plugins/wpc-smart-notification/" title="WPC Smart Notification" rel="ugc">WPC Smart Notification</a></li>
<li><a href="https://wordpress.org/plugins/wpc-ajax-add-to-cart/" title="WPC AJAX Add to Cart" rel="ugc">WPC AJAX Add to Cart</a></li>
</ul>

WPC Smart Linked Products – Upsells & Cross-sells for WooCommerce

WPC Smart Linked Products plugin simplifies managing related, upsells, and cross-sells products in bulk with custom rules and mixed combinations.

Related YouTube Videos vs WPC Smart Linked Products – Upsells & Cross-sells for WooCommerce