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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 |
|---|---|
| 75 | * Filter the thumbnail shape for use in the embed template. |
| 76 | * |
| 77 | * Rectangular images are shown above the title |
| 78 | * while square images are shown next to the content. |
| 79 | * |
| 80 | * @since 4.4.0 |
| 81 | * |
| 82 | * @param string $shape Thumbnail image shape. Either 'rectangular' or 'square'. |
| 83 | */ |
| 84 | $shape = apply_filters( 'embed_thumbnail_image_shape', $shape ); |
| 85 | } |
| 86 | ?> |
| 87 | <div <?php post_class( 'wp-embed' ); ?>> |
| 88 | <?php if ( $thumbnail_id && 'rectangular' === $shape ) : ?> |
| 89 | <div class="wp-embed-featured-image rectangular"> |
| 90 | <a href="<?php the_permalink(); ?>" target="_top"> |
| 91 | <?php echo wp_get_attachment_image( $thumbnail_id, $image_size ); ?> |
| 92 | </a> |
| 93 | </div> |