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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 |
---|---|
1539 | */ |
1540 | function get_calendar($initial = true, $echo = true) { |
1541 | global $wpdb, $m, $monthnum, $year, $wp_locale, $posts; |
1542 |
|
1543 | $key = md5( $m . $monthnum . $year ); |
1544 | if ( $cache = wp_cache_get( 'get_calendar', 'calendar' ) ) { |
1545 | if ( is_array($cache) && isset( $cache[ $key ] ) ) { |
1546 | if ( $echo ) { |
1547 | /** This filter is documented in wp-includes/general-template.php */ |
1548 | echo apply_filters( 'get_calendar', $cache[$key] ); |
1549 | return; |
1550 | } else { |
1551 | /** This filter is documented in wp-includes/general-template.php */ |
1552 | return apply_filters( 'get_calendar', $cache[$key] ); |
1553 | } |
1554 | } |
1555 | } |
1556 |
|
1557 | if ( !is_array($cache) ) |
1558 | $cache = array(); |
1559 |
|
1560 | // Quick check. If we have no posts at all, abort! |
1561 | if ( !$posts ) { |
Line | Code |
1734 |
|
1735 | if ( $echo ) { |
1736 | /** |
1737 | * Filter the HTML calendar output. |
1738 | * |
1739 | * @since 3.0.0 |
1740 | * |
1741 | * @param string $calendar_output HTML output of the calendar. |
1742 | */ |
1743 | echo apply_filters( 'get_calendar', $calendar_output ); |
1744 | } else { |
1745 | /** This filter is documented in wp-includes/general-template.php */ |
1746 | return apply_filters( 'get_calendar', $calendar_output ); |
1747 | } |
1748 |
|
1749 | } |
1750 |
|
1751 | /** |
1752 | * Purge the cached results of get_calendar. |
1753 | * |
1754 | * @see get_calendar |
1755 | * @since 2.1.0 |