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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 | 
|---|---|
| 21 |                     __( 'It looks like nothing was found at this location. Maybe try visiting %s directly?' ), | 
| 22 |                     '<strong><a href="' . esc_url( home_url() ) . '">' . esc_html( get_bloginfo( 'name' ) ) . '</a></strong>' | 
| 23 |                ); | 
| 24 |                ?> | 
| 25 |           </p> | 
| 26 |      </div> | 
| 27 |  | 
| 28 |      <?php | 
| 29 |      /** This filter is documented in wp-includes/theme-compat/embed-content.php */ | 
| 30 |      do_action( 'embed_content' ); | 
| 31 |      ?> | 
| 32 |  | 
| 33 |      <div class="wp-embed-footer"> | 
| 34 |           <?php the_embed_site_title() ?> | 
| 35 |      </div> | 
| 36 | </div> | 
| 37 |  |