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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 | 
|---|---|
| 389 |                <li><a href="<?php bloginfo('comments_rss2_url'); ?>"><?php _e('Comments <abbr title="Really Simple Syndication">RSS</abbr>'); ?></a></li> | 
| 390 | <?php | 
| 391 |                /** | 
| 392 |                 * Filter the "Powered by WordPress" text in the Meta widget. | 
| 393 |                 * | 
| 394 |                 * @since 3.6.0 | 
| 395 |                 * | 
| 396 |                 * @param string $title_text Default title text for the WordPress.org link. | 
| 397 |                 */ | 
| 398 |                echo apply_filters( 'widget_meta_poweredby', sprintf( '<li><a href="%s" title="%s">%s</a></li>', | 
| 399 |                     esc_url( __( 'https://wordpress.org/' ) ), | 
| 400 |                     esc_attr__( 'Powered by WordPress, state-of-the-art semantic personal publishing platform.' ), | 
| 401 |                     _x( 'WordPress.org', 'meta widget link text' ) | 
| 402 |                ) ); | 
| 403 |  | 
| 404 |                wp_meta(); | 
| 405 | ?> | 
| 406 |                </ul> | 
| 407 | <?php |