mark l chaves

With GIC, you can display the title, caption, and description image attributes. You can also change/filter the rendering HTML to whatever you want.
After installing and activating GIC, write your filter and add the WordPress <a href="https://codex.wordpress.org/Gallery_Shortcode" rel="nofollow ugc">Gallery shortcode</a> to your page.
If you’ve been dreaming of writing a filter to customise the gallery image captions, then this plugin is for you.
<a href="https://streetphotography.blog/gallery-image-captions-demo/" rel="nofollow ugc">Visit the live demo page.</a>
<h4>Motivation</h4>
The default WordPress gallery shortcode will only display the caption from the media’s attachment metadata. Sometimes it’s nice to display more like the title—even the description.
The GIC plugin overrides the WordPress gallery shortcode function to create a <a href="https://developer.wordpress.org/plugins/hooks/" rel="nofollow ugc">hook</a>. With this hook you can do a little bit more than just displaying the caption.
Some premium themes hide the caption completely. This leaves photography lovers like me scratching their head and spending precious time cobbling together makeshift caption blocks.
<h3>Usage</h3>
<h4>Custom Filter For Displaying Captions</h4>
The crux of this plugin is the ability to filter the gallery image caption. The <code>galimgcaps_gallery_image_caption</code> hook makes this possible.
For the usage examples below, this is the filter used.
<pre><code>/**
 * Custom Filter for Gallery Image Captions
 *
 * Note: Avoid altering captiontag, selector, and itemtag.
 */
function mlc_gallery_image_caption($attachment_id, $captiontag, $selector, $itemtag) {

 $id = $attachment_id;

 // Grab the meta from the GIC plugin.
 $my_image_meta = galimgcaps_get_image_meta($id);

 /**
 * Here's where to customise the caption content.
 * 
 * This example uses the meta title, caption, and description. 
 * 
 * You can display any value from the $my_image_meta array. 
 * You can add your own HTML too.
 */
 return "<{$captiontag} class='wp-caption-text gallery-caption' id='{$selector}-{$id}'>" .
 "Title: " . $my_image_meta['title'] . " " .
 "Caption: " . $my_image_meta['caption'] . " ". 
 "Description: ". $my_image_meta['description'] . 
 "</{$captiontag}></{$itemtag}>";

}
add_filter('galimgcaps_gallery_image_caption', 'mlc_gallery_image_caption', 10, 4);
</code></pre>
Feel free to use this filter code as a starter template. After activating the GIC plugin, add the code above to your child theme’s <code>functions.php</code> file. Rename the function and tweak the return string to suit your needs.
<h4>New Filter To Get Custom Fields</h4>
<pre><code>/**
 * New GIC 1.4.0 filter for custom meta fields.
 */
function gic_add_custom_fields( $image_meta, $attachment ) {

 // This is how you add a custom fields to the array that
 // GIC uses to display captions.
 $image_meta['credit_text'] = $attachment->credit_text;
 $image_meta['credit_link'] = $attachment->credit_link;

 return $image_meta;
}
add_filter( 'galimgcaps_image_meta', 'gic_add_custom_fields', 10, 2 );
</code></pre>
To use these two custom fields, your <code>galimgcaps_gallery_image_caption</code> would look something like this.
<pre><code>function mlc_gallery_image_caption($attachment_id, $captiontag, $selector, $itemtag) {

 $id = $attachment_id;

 // Grab the meta from the GIC plugin.
 $my_image_meta = galimgcaps_get_image_meta($id);

 // If there's credit, give it where it's due complete with link.
 $credit = $my_image_meta['description'] ? 
 " Credit: <a style='display: inline;' href='" . 
 $my_image_meta['credit_link'] . 
 "'>" . $my_image_meta['credit_text'] . "</a>" . " " : 
 '';

 /**
 * With GIC 1.4.0 you can also add custom media attachment fields
 * to your captions.
 */
 return "<{$captiontag} class='wp-caption-text gallery-caption' id='{$selector}-{$id}'>" .
 "Caption: " . $my_image_meta['caption'] . " " . 
 $credit .
 "</{$captiontag}></{$itemtag}>";

}
add_filter('galimgcaps_gallery_image_caption', 'mlc_gallery_image_caption', 10, 4);
</code></pre>
Since v1.2.0, GIC automatically adds an Image ID column to your WordPress Media Library. This is to help you add the image IDs to your GIC shortcodes.
<a href="https://ps.w.org/gallery-image-captions/assets/screenshot-11.png" rel="nofollow ugc">See where GIC automatically adds an Image ID column to your WordPress Media Library.</a>
New in v1.4.0, GIC support custom media attachment fields.
<h3>Usage Example 1</h3>
<h4>Shortcode</h4>
For starters, let’s use a
<pre><code> 
</code></pre>
tag for the caption tag.
<pre><code>[gallery size="full" columns="1" link="file" ids="114" captiontag="p"]
</code></pre>
<h4>Styling</h4>
Let’s override the generated styles with our own style for one particular image.
<pre><code>/* Targeting a Specific Image */

/* Add some padding all around. */
#gallery-1 .gallery-item, 
#gallery-1 .gallery-item p {
 padding: 1%;
}

/* Add some moody background with typewriter font. */
#gallery-1 .gallery-item {
 color: whitesmoke;
 background-color: black;
 font-size: 1.25rem;
 font-family: Courier, monospace;
 text-align: left !important;
}
</code></pre>
<h3>Usage Example 2</h3>
<h4>Shortcode</h4>
A 2 column x 1 row gallery with large size images using an H4 for the caption.
<pre><code>[gallery size="large" columns="2" link="file" ids="109,106" captiontag="h4"]
</code></pre>
A 3 column x 1 row gallery with medium size images using a blockquote for the caption.
<pre><code>[gallery size="medium" columns="3" link="file" ids="109,106,108" captiontag="blockquote"]
</code></pre>
Did you notice that we are using
<pre><code><blockquote></blockquote> 
</code></pre>
in the second shortcode? Let’s give it try just for kicks.
<h4>Styling</h4>
<pre><code>/* 1. Style the H4 Used in the Caption Example */
h4 {
 color: #777777 !important;
 font-size: 1.2rem !important;
 font-family: Helvetica, Arial, sans-serif !important;
}

/* 2. Help Align the Blockquote */
#gallery-3 .gallery-caption {
 margin-left: 40px !important;
}
</code></pre>
<h3>Responsive CSS Example</h3>
I recommend adding the following media queries if you use galleries with more than one image. The two media queries below will stack 2×1 and 3×1 galleries into a 1 column x n rows or 2 column x n rows as needed.
<pre><code>/* Media Queries for Responsive Galleries */

/**
 * Styling based on article "How To: Style Your WordPress Gallery"
 * by Par Nicolas.
 * 
 * https://theme.fm/how-to-style-your-wordpress-gallery/
 */

/* Mobile Portrait Breakpoint - 1 column */
@media only screen and (max-width: 719.998px) {
 .gallery-columns-2 .gallery-item,
 .gallery-columns-3 .gallery-item { 
 width: 100% !important; 
 }
}

/* Mobile Landscape and Tablet Breakpoints - 2 columns */
@media only screen and (min-width: 720px) and (max-width: 1024px) {
 .gallery-columns-3 .gallery-item { 
 width: 50% !important; 
 }
}
</code></pre>

Gallery Image Captions (GIC)

Gallery Image Captions (GIC) allows you to customise WordPress gallery image captions.

Janis Elsts

Lets you disable automatic formatting like smart quotes and automatic paragraph creation, and use raw HTML/JS/CSS code in your posts without WordPress messing it up.
Features
With this plugin, you can wrap any part of your post in [raw]…[/raw] tags to prevent WordPress from converting newlines to HTML paragraphs, replacing apostrophes with typographic quotes and so on. This is very useful if you need to add a CSS block or JavaScript to your post.
RawHTML will also add new checkboxes to the “Edit Post” screen that let you disable certain WP filters on a per-post basis. This way you can:
<ul>
<li>Disable wptexturize (the function that creates smart quotes and other typographic characters).</li>
<li>Disable automatic paragraph creation.</li>
<li>Disable image smilies. </li>
<li>Disable convert_chars (the function that converts ampersands to HTML entities and “fixes” some Unicode characters).</li>
</ul>
The free version only supports editing posts in the Text tab (called “HTML” in older WordPress versions). <a href="http://rawhtmlpro.com/?utm_source=wordpress.org&utm_medium=readme_link&utm_campaign=RawHTML%20free" rel="nofollow ugc">Get the Pro version</a> if you want to be able to switch between Text and the Visual editor without WordPress messing up your content.
Compatibility
This plugin doesn’t fully support the Gutenberg editor. As of WordPress 5.0, some Raw HTML features will only work if you use the <a href="https://wordpress.org/plugins/classic-editor/" rel="ugc">Classic Editor</a> plugin.
Usage
To prevent a part of your post or page from being filtered by WordPress, switch to the Text/HTML editor and wrap it in <code>[raw]...[/raw]</code> or <code>...</code> tags. These two versions work exactly the same, except that the latter won’t be visible to your visitors even if you deactivate Raw HTML.
Example :
<pre><code>[raw]
This 

is 

a "test"!
[/raw]
</code></pre>
In this case, the tags will prevent WordPress from inserting paragraph breaks between “This”, “is” and “a “test””, as well as ensure that the double quotes arround “test” are not converted to typographic (curly) quotes.
To avoid problems, only edit posts that contain your custom code in Text/HTML mode. If you’d like to be able to also use the Visual editor, <a href="http://rawhtmlpro.com/?utm_source=wordpress.org&utm_medium=readme_link&utm_campaign=RawHTML%20free" rel="nofollow ugc">get the Pro version</a>. It will make the code betwen [raw] tags appear as a read-only placeholder when viewed in Visual mode, ensuring WordPress doesn’t change it.
Combining shortcodes
By default, shortcodes that are inside [raw] tags will not work. They will just show up as plain text. To enable shortcodes, add the <code>shortcodes=1</code> attribute to the tag:
<pre><code>[raw shortcodes=1]This [shortcode] will be run.[/raw]

[raw]This [shortcode] won't work.[/raw]
</code></pre>
Preserving <code>[raw]</code> code in excerpts
By default, the plugin will automatically remove any code that’s inside <code>[raw]...[/raw]</code> tags from post excerpts. You can prevent that by adding the following line to <code>wp-config.php</code>:
<pre><code>define('RAW_HTML_KEEP_RAW_IN_EXCERPTS', true);
</code></pre>
This will ensure that the plugin doesn’t strip <code>[raw]</code> blocks from automatically generated excerpts.
Notes
Some features of Raw HTML will only work for users who have the “unfiltered_html” capability. In a normal WordPress install that includes the Editor and Administrator roles. In a Multisite install, only the Super Admin has this capability by default.

Raw HTML

Simply works

Lets you use raw HTML or any other code in your posts. You can also disable smart quotes and other automatic formatting on a per-post basis.

Gallery Image Captions (GIC) vs Raw HTML