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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.
This hook occurs 4 times in this file.
Line | Code |
---|---|
1387 | function get_calendar($initial = true, $echo = true) { |
1388 | global $wpdb, $m, $monthnum, $year, $wp_locale, $posts; |
1389 |
|
1390 | $cache = array(); |
1391 | $key = md5( $m . $monthnum . $year ); |
1392 | if ( $cache = wp_cache_get( 'get_calendar', 'calendar' ) ) { |
1393 | if ( is_array($cache) && isset( $cache[ $key ] ) ) { |
1394 | if ( $echo ) { |
1395 | /** This filter is documented in wp-includes/general-template.php */ |
1396 | echo apply_filters( 'get_calendar', $cache[$key] ); |
1397 | return; |
1398 | } else { |
1399 | /** This filter is documented in wp-includes/general-template.php */ |
1400 | return apply_filters( 'get_calendar', $cache[$key] ); |
1401 | } |
1402 | } |
1403 | } |
1404 |
|
1405 | if ( !is_array($cache) ) |
1406 | $cache = array(); |
1407 |
|
1408 | // Quick check. If we have no posts at all, abort! |
1409 | if ( !$posts ) { |
Line | Code |
1582 |
|
1583 | if ( $echo ) { |
1584 | /** |
1585 | * Filter the HTML calendar output. |
1586 | * |
1587 | * @since 3.0.0 |
1588 | * |
1589 | * @param string $calendar_output HTML output of the calendar. |
1590 | */ |
1591 | echo apply_filters( 'get_calendar', $calendar_output ); |
1592 | } else { |
1593 | /** This filter is documented in wp-includes/general-template.php */ |
1594 | return apply_filters( 'get_calendar', $calendar_output ); |
1595 | } |
1596 |
|
1597 | } |
1598 |
|
1599 | /** |
1600 | * Purge the cached results of get_calendar. |
1601 | * |
1602 | * @see get_calendar |
1603 | * @since 2.1.0 |