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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code | 
|---|---|
| 30 |                               <figure class="entry-attachment wp-block-image"> | 
| 31 |                               <?php | 
| 32 |                                    /** | 
| 33 |                                     * Filter the default twentynineteen image attachment size. | 
| 34 |                                     * | 
| 35 |                                     * @since Twenty Sixteen 1.0 | 
| 36 |                                     * | 
| 37 |                                     * @param string $image_size Image size. Default 'large'. | 
| 38 |                                     */ | 
| 39 |                                    $image_size = apply_filters( 'twentynineteen_attachment_size', 'full' ); | 
| 40 |  | 
| 41 |                                    echo wp_get_attachment_image( get_the_ID(), $image_size ); | 
| 42 |                               ?> | 
| 43 |  | 
| 44 |                                    <figcaption class="wp-caption-text"><?php the_excerpt(); ?></figcaption> | 
| 45 |  | 
| 46 |                               </figure><!-- .entry-attachment --> | 
| 47 |  | 
| 48 |                               <?php |