get_calendar

			wp_cache_set( $key, $results, 'posts' );
		}
		if ( $results ) {
			$after = $parsed_args['after'];
			foreach ( (array) $results as $result ) {
				$url = get_day_link( $result->year, $result->month, $result->dayofmonth );
				if ( 'post' !== $parsed_args['post_type'] ) {
					$url = add_query_arg( 'post_type', $parsed_args['post_type'], $url );
				}
				$date = sprintf( '%1$d-%2$02d-%3$02d 00:00:00', $result->year, $result->month, $result->dayofmonth );
				$text = mysql2date( get_option( 'date_format' ), $date );
				if ( $parsed_args['show_post_count'] ) {
					$parsed_args['after'] = ' (' . $result->posts . ')' . $after;
				}
				$selected = is_archive() && (string) $parsed_args['year'] === $result->year && (string) $parsed_args['monthnum'] === $result->month && (string) $parsed_args['day'] === $result->dayofmonth;
				$output  .= get_archives_link( $url, $text, $parsed_args['format'], $parsed_args['before'], $parsed_args['after'], $selected );
			}
		}
	} elseif ( 'weekly' === $parsed_args['type'] ) {
		$week    = _wp_mysql_week( '`post_date`' );
		$query   = "SELECT DISTINCT $week AS `week`, YEAR( `post_date` ) AS `yr`, DATE_FORMAT( `post_date`, '%Y-%m-%d' ) AS `yyyymmdd`, count( `ID` ) AS `posts` FROM `$wpdb->posts` $join $where GROUP BY $week, YEAR( `post_date` ) ORDER BY `post_date` $order $limit";
		$key     = md5( $query );
		$key     = "wp_get_archives:$key:$last_changed";
		$results = wp_cache_get( $key, 'posts' );
		if ( ! $results ) {
			$results = $wpdb->get_results( $query );
			wp_cache_set( $key, $results, 'posts' );
		}
		$arc_w_last = '';
		if ( $results ) {
			$after = $parsed_args['after'];
			foreach ( (array) $results as $result ) {
				if ( $result->week != $arc_w_last ) {
					$arc_year       = $result->yr;
					$arc_w_last     = $result->week;
					$arc_week       = get_weekstartend( $result->yyyymmdd, get_option( 'start_of_week' ) );
					$arc_week_start = date_i18n( get_option( 'date_format' ), $arc_week['start'] );
					$arc_week_end   = date_i18n( get_option( 'date_format' ), $arc_week['end'] );
					$url            = add_query_arg(
						array(
							'm' => $arc_year,
							'w' => $result->week,
						),
						home_url( '/' )
					);
					if ( 'post' !== $parsed_args['post_type'] ) {
						$url = add_query_arg( 'post_type', $parsed_args['post_type'], $url );
					}
					$text = $arc_week_start . $archive_week_separator . $arc_week_end;
					if ( $parsed_args['show_post_count'] ) {
						$parsed_args['after'] = ' (' . $result->posts . ')' . $after;
					}
					$selected = is_archive() && (string) $parsed_args['year'] === $result->yr && (string) $parsed_args['w'] === $result->week;
					$output  .= get_archives_link( $url, $text, $parsed_args['format'], $parsed_args['before'], $parsed_args['after'], $selected );
				}
			}
		}
	} elseif ( ( 'postbypost' === $parsed_args['type'] ) || ( 'alpha' === $parsed_args['type'] ) ) {
		$orderby = ( 'alpha' === $parsed_args['type'] ) ? 'post_title ASC ' : 'post_date DESC, ID DESC ';
		$query   = "SELECT * FROM $wpdb->posts $join $where ORDER BY $orderby $limit";
		$key     = md5( $query );
		$key     = "wp_get_archives:$key:$last_changed";
		$results = wp_cache_get( $key, 'posts' );
		if ( ! $results ) {
			$results = $wpdb->get_results( $query );
			wp_cache_set( $key, $results, 'posts' );
		}
		if ( $results ) {
			foreach ( (array) $results as $result ) {
				if ( '0000-00-00 00:00:00' !== $result->post_date ) {
					$url = get_permalink( $result );
					if ( $result->post_title ) {
						/** This filter is documented in wp-includes/post-template.php */
						$text = strip_tags( apply_filters( 'the_title', $result->post_title, $result->ID ) );
					} else {
						$text = $result->ID;
					}
					$selected = get_the_ID() === $result->ID;
					$output  .= get_archives_link( $url, $text, $parsed_args['format'], $parsed_args['before'], $parsed_args['after'], $selected );
				}
			}
		}
	}

	if ( $parsed_args['echo'] ) {
		echo $output;
	} else {
		return $output;
	}
}

/**
 * Get number of days since the start of the week.
 *
 * @since 1.5.0
 *
 * @param int $num Number of day.
 * @return float Days since the start of the week.
 */
function calendar_week_mod( $num ) {
	$base = 7;
	return ( $num - $base * floor( $num / $base ) );
}

/**
 * Display calendar with days that have posts as links.
 *
 * The calendar is cached, which will be retrieved, if it exists. If there are
 * no posts for the month, then it will not be displayed.
 *
 * @since 1.0.0
 *
 * @global wpdb      $wpdb      WordPress database abstraction object.
 * @global int       $m
 * @global int       $monthnum
 * @global int       $year
 * @global WP_Locale $wp_locale WordPress date and time locale object.
 * @global array     $posts
 *
 * @param bool $initial Optional. Whether to use initial calendar names. Default true.
 * @param bool $echo    Optional. Whether to display the calendar output. Default true.
 * @return void|string Void if `$echo` argument is true, calendar HTML if `$echo` is false.
 */
function get_calendar( $initial = true, $echo = true ) {
	global $wpdb, $m, $monthnum, $year, $wp_locale, $posts;

	$key   = md5( $m . $monthnum . $year );
	$cache = wp_cache_get( 'get_calendar', 'calendar' );

	if ( $cache && is_array( $cache ) && isset( $cache[ $key ] ) ) {
		/** This filter is documented in wp-includes/general-template.php */
		$output = apply_filters( 'get_calendar', $cache[ $key ] );

		if ( $echo ) {
			echo $output;
			return;
		}

		return $output;
	}

	if ( ! is_array( $cache ) ) {
		$cache = array();
	}

	// Quick check. If we have no posts at all, abort!
	if ( ! $posts ) {
		$gotsome = $wpdb->get_var( "SELECT 1 as test FROM $wpdb->posts WHERE post_type = 'post' AND post_status = 'publish' LIMIT 1" );
		if ( ! $gotsome ) {
			$cache[ $key ] = '';
			wp_cache_set( 'get_calendar', $cache, 'calendar' );
			return;
		}
	}

	if ( isset( $_GET['w'] ) ) {
		$w = (int) $_GET['w'];
	}
	// week_begins = 0 stands for Sunday.
	$week_begins = (int) get_option( 'start_of_week' );

	// Let's figure out when we are.
	if ( ! empty( $monthnum ) && ! empty( $year ) ) {
		$thismonth = zeroise( intval( $monthnum ), 2 );
		$thisyear  = (int) $year;
	} elseif ( ! empty( $w ) ) {
		// We need to get the month from MySQL.
		$thisyear = (int) substr( $m, 0, 4 );
		// It seems MySQL's weeks disagree with PHP's.
		$d         = ( ( $w - 1 ) * 7 ) + 6;
		$thismonth = $wpdb->get_var( "SELECT DATE_FORMAT((DATE_ADD('{$thisyear}0101', INTERVAL $d DAY) ), '%m')" );
	} elseif ( ! empty( $m ) ) {
		$thisyear = (int) substr( $m, 0, 4 );
		if ( strlen( $m ) < 6 ) {
			$thismonth = '01';
		} else {
			$thismonth = zeroise( (int) substr( $m, 4, 2 ), 2 );
		}
	} else {
		$thisyear  = current_time( 'Y' );
		$thismonth = current_time( 'm' );
	}

	$unixmonth = mktime( 0, 0, 0, $thismonth, 1, $thisyear );
	$last_day  = gmdate( 't', $unixmonth );

	// Get the next and previous month and year with at least one post.
	$previous = $wpdb->get_row(
		"SELECT MONTH(post_date) AS month, YEAR(post_date) AS year
		FROM $wpdb->posts
		WHERE post_date < '$thisyear-$thismonth-01'
		AND post_type = 'post' AND post_status = 'publish'
			ORDER BY post_date DESC
			LIMIT 1"
	);
	$next     = $wpdb->get_row(
		"SELECT MONTH(post_date) AS month, YEAR(post_date) AS year
		FROM $wpdb->posts
		WHERE post_date > '$thisyear-$thismonth-{$last_day} 23:59:59'
		AND post_type = 'post' AND post_status = 'publish'
			ORDER BY post_date ASC
			LIMIT 1"
	);

	/* translators: Calendar caption: 1: Month name, 2: 4-digit year. */
	$calendar_caption = _x( '%1$s %2$s', 'calendar caption' );
	$calendar_output  = '<table id="wp-calendar" class="wp-calendar-table">
	<caption>' . sprintf(
		$calendar_caption,
		$wp_locale->get_month( $thismonth ),
		gmdate( 'Y', $unixmonth )
	) . '</caption>
	<thead>
	<tr>';

	$myweek = array();

	for ( $wdcount = 0; $wdcount <= 6; $wdcount++ ) {