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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 | 
|---|---|
| 300 |                               <?php | 
| 301 |                                    /* translators: 1: Suggested width number, 2: Suggested height number. */ | 
| 302 |                                    printf( __( 'Suggested image dimensions: %1$s by %2$s pixels.' ), '{{data.suggestedWidth}}', '{{data.suggestedHeight}}' ); | 
| 303 |                               ?> | 
| 304 |                          </p> | 
| 305 |                     <# } #> | 
| 306 |  | 
| 307 |                     <?php | 
| 308 |                     /** This action is documented in wp-admin/includes/media.php */ | 
| 309 |                     do_action( 'post-upload-ui' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores | 
| 310 |                     ?> | 
| 311 |                </div> | 
| 312 |           <?php endif; ?> | 
| 313 |           </div> | 
| 314 |      </script> | 
| 315 |  | 
| 316 |      <?php // Template for the view switchers, used for example in the Media Grid. ?> | 
| 317 |      <script type="text/html" id="tmpl-media-library-view-switcher"> | 
| 318 |           <a href="<?php echo esc_url( add_query_arg( 'mode', 'list', $_SERVER['REQUEST_URI'] ) ); ?>" class="view-list"> |