yoren

Yoren Chang

Try it live in your browser — <a href="https://playground.wordpress.net/?blueprint-url=https://raw.githubusercontent.com/1fixdotio/categories-metabox-enhanced/master/blueprint/playground.blueprint.json" rel="nofollow ugc">launch the WordPress Playground demo</a>. Boots a WordPress instance with this plugin active, the Category taxonomy pre-configured as radio buttons, and seeded posts you can edit in the Block Editor or run through Quick Edit / Bulk Edit immediately.
Thanks to <a href="https://github.com/WebDevStudios/Taxonomy_Single_Term" rel="nofollow ugc">Taxonomy_Single_Term</a>, a library created by <a href="http://webdevstudios.com/" rel="nofollow ugc">WebDevStudios</a>, it made my work much easier on creating this plugin.
With Categories Metabox Enhanced, you can:
<ul>
<li>Change the built-in Categories metabox/panel to a single term UI, which means replacing the checkboxes with radio buttons or a select drop-down.</li>
<li>Apply the single term UI to other hierarchical taxonomies from the plugin’s Settings page.</li>
<li>Configure each hierarchical taxonomy independently — the same install can keep one taxonomy as checkboxes while another is forced to radio.</li>
<li>Customize the single term UI by setting these options:
<ul>
<li>Option type (checkbox, radio, or select).</li>
<li>Priority and position (context) of the metabox placement. Classic editor only.</li>
<li>Title of the metabox / Block Editor panel.</li>
<li>Whether child-terms should be indented.</li>
<li>Whether adding new terms from the metabox is enabled.</li>
<li>Whether a term selection is required (Force selection). When on, the classic metabox hides the “None” option, the Block Editor sidebar drops the “— Select —” entry once a term is chosen, and an empty save is substituted with a default term server-side so REST and programmatic callers can’t bypass it.</li>
</ul>
</li>
</ul>
The single-term invariant is enforced everywhere posts can be saved: the Classic Editor metabox, the Block Editor sidebar panel, Quick Edit, Bulk Edit, the REST API, WP-CLI, and any code that calls <code>wp_set_object_terms()</code> directly. The classic-editor and Block Editor surfaces enforce in the UI; everything else is enforced on the server via the <code>set_object_terms</code> action, which coerces multi-term submissions to the last term and substitutes the default term on empty submissions when Force selection is on.
The substituted default term resolves in this order: the <code>default_<taxonomy></code> option (e.g. <code>default_category</code>) → the <code>default_term_<taxonomy></code> option populated by <code>register_taxonomy()</code> <code>default_term</code> arg (WP 5.5+) → the first term ordered by name. Override per taxonomy with the <code>of_cme_force_selection_default_term</code> filter.
The Block Editor sidebar panel is rendered for taxonomies registered with <code>show_in_rest = true</code>. Hierarchical taxonomies that opt out of REST fall back to the Classic Editor metabox path.

Categories Metabox Enhanced

Replace the checkboxes with radio buttons or a select drop-down in the built-in Categories metabox and the Block Editor sidebar panel.

Willy Bahuaud

This plugin add a metabox which allox to upload and link multiple images to one post. 
Pictures are linked by the way of meta_value (and attachments ID). They can be reordered using drag and drop.
Number of allowed pictures and concerned post types can be overited using hooks.
Plugin includes many functions to retrieve linked pictures. 
For more information on using the plugin, refer to the section <a href="/extend/plugins/multi-image-metabox/other_notes/" rel="nofollow ugc">“Other Notes”</a>.
<h3>Set concerned post types</h3>
Paste this into your theme’s functions.php file :
 
<h3>Set allowed number of picts</h3>
Paste this into your theme’s functions.php file : 
 ‘_image1’, 
 ‘image2’ => ‘_image2’, 
 ); 
 return $picts; 
 } 
 ?>
<h4>Set allowed number of picts, depending to the post_type</h4>
Paste this into your theme’s functions.php file : 
 add_filter(‘list_images’,’my_list_images’,10,2); 
 function my_list_images($list_images, $cpt){ 
 global $typenow; 
 if($typenow == “my_custom_post_type” || $cpt == “my_custom_post_type”) 
 $picts = array( 
 ‘image1’ => ‘_image1’, 
 ‘image2’ => ‘_image2’, 
 ‘image3’ => ‘_image3’, 
 ); 
 else 
 $picts = array( 
 ‘image1’ => ‘_image1’, 
 ‘image2’ => ‘_image2’, 
 ‘image3’ => ‘_image3’, 
 ‘image4’ => ‘_image4’, 
 ‘image5’ => ‘_image5’, 
 ‘image6’ => ‘_image6’, 
 ‘image7’ => ‘_image7’, 
 ‘image8’ => ‘_image8’, 
 ); 
 return $picts; 
 }
<h3>get_images_ids()</h3>
This function have to be used into a template file, or any function. 
It return an array of the linked attachments’s ID.
It take two arguments whose are :
<ol>
<li>include the thumbnail ? (boolean) if true include the thumbnail in the returned datas</li>
<li>
ID (integer) for targeting images linked to a specific post
 45, 
 ‘image1’ => 5, 
 ‘image2’ => 6, 
 ‘image3’ => 12, 
 ‘image6’ => 20, 
 ‘image7’ => 15 
);
//Empty pictures ar not returned
?>
<h3>get_images_src()</h3>
This function have to be used into a template file, or any function. 
It return an array of URIs and dimension for the linked attachments’s, by order.
</li>
</ol>
It take three agruments whose are :
<ol>
<li>size (string) the size to return</li>
<li>include the thumbnail ? (boolean) if true include the thumbnail in the returned datas</li>
<li>
ID (integer) for targeting images linked to a specific post
 array( 
 [0] => ‘http://url_of_the_medium_pict.jpg’, 
 [1] => 340, 
 [2] => 200, 
 [3] => false //I’ve no idea what is it… 
 ), 
 ‘image2’ => array( 
 [0] => ‘http://url_of_the_medium_second_pict.jpg’, 
 [1] => 340, 
 [2] => 200, 
 [3] => false //I’ve no idea what is it… 
 ) 
);
?>
<h3>get_multi_images_src()</h3>
Same as get_image_src(), but return two sizes for all the pictures.
</li>
</ol>
It take for agruments whose are :
<ol>
<li>size (string) the size to return</li>
<li>size2 (string) another size to return</li>
<li>include the thumbnail ? (boolean) if true include the thumbnail in the returned datas</li>
<li>
ID (integer) for targeting images linked to a specific post
 array( 
 [0] => array( 
 [0] => ‘http://url_of_the_medium_pict.jpg’, 
 [1] => 340, 
 [2] => 200, 
 [3] => false //I’ve no idea what is it… 
 ), 
 [1] => array( 
 [0] => ‘http://url_of_the_full_pict.jpg’, 
 [1] => 1020, 
 [2] => 600, 
 [3] => false //I’ve no idea what is it… 
 ), 
 ), 
 ‘image2’ => array( 
 [0] => array( 
 [0] => ‘http://url_of_the_medium_second_pict.jpg’, 
 [1] => 340, 
 [2] => 200, 
 [3] => false //I’ve no idea what is it… 
 ), 
 [1] => array( 
 [0] => ‘http://url_of_the_second_full_pict.jpg’, 
 [1] => 1020, 
 [2] => 600, 
 [3] => false //I’ve no idea what is it… 
 ) 
 ) 
); 
//Empty pictures ar not returned
?></li>
</ol>

Multi Image Metabox

Add a multi-image metabox to your posts, pages and custom post types

Categories Metabox Enhanced vs Multi Image Metabox