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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 |
|---|---|
| 34 | <div class="entry-attachment"> |
| 35 | <?php |
| 36 | /** |
| 37 | * Filter the default Twenty Fifteen image attachment size. |
| 38 | * |
| 39 | * @since Twenty Fifteen 1.0 |
| 40 | * |
| 41 | * @param string $image_size Image size. Default 'large'. |
| 42 | */ |
| 43 | $image_size = apply_filters( 'twentyfifteen_attachment_size', 'large' ); |
| 44 | |
| 45 | echo wp_get_attachment_image( get_the_ID(), $image_size ); |
| 46 | ?> |
| 47 | |
| 48 | <?php if ( has_excerpt() ) : ?> |
| 49 | <div class="entry-caption"> |
| 50 | <?php the_excerpt(); ?> |
| 51 | </div><!-- .entry-caption --> |
| 52 | <?php endif; ?> |