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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 |
|---|---|
| 536 | while ( $next_posts = array_splice( $post_ids, 0, 20 ) ) { |
| 537 | $where = 'WHERE ID IN (' . implode( ',', $next_posts ) . ')'; |
| 538 | $posts = $wpdb->get_results( "SELECT * FROM {$wpdb->posts} $where" ); |
| 539 | |
| 540 | // Begin Loop. |
| 541 | foreach ( $posts as $post ) { |
| 542 | setup_postdata( $post ); |
| 543 | |
| 544 | /** This filter is documented in wp-includes/feed.php */ |
| 545 | $title = apply_filters( 'the_title_rss', $post->post_title ); |
| 546 | |
| 547 | /** |
| 548 | * Filters the post content used for WXR exports. |
| 549 | * |
| 550 | * @since 2.5.0 |
| 551 | * |
| 552 | * @param string $post_content Content of the current post. |
| 553 | */ |
| 554 | $content = wxr_cdata( apply_filters( 'the_content_export', $post->post_content ) ); |