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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 |
|---|---|
| 374 | function is_multi_author() { |
| 375 | global $wpdb; |
| 376 | |
| 377 | if ( false === ( $is_multi_author = wp_cache_get('is_multi_author', 'posts') ) ) { |
| 378 | $rows = (array) $wpdb->get_col("SELECT DISTINCT post_author FROM $wpdb->posts WHERE post_type = 'post' AND post_status = 'publish' LIMIT 2"); |
| 379 | $is_multi_author = 1 < count( $rows ) ? 1 : 0; |
| 380 | wp_cache_set('is_multi_author', $is_multi_author, 'posts'); |
| 381 | } |
| 382 | |
| 383 | return apply_filters( 'is_multi_author', (bool) $is_multi_author ); |
| 384 | } |
| 385 | |
| 386 | /** |
| 387 | * Helper function to clear the cache for number of authors. |
| 388 | * |
| 389 | * @private |
| 390 | */ |
| 391 | function __clear_multi_author_cache() { |
| 392 | wp_cache_delete('is_multi_author', 'posts'); |