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Description

Displays 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.

Usage

$void|string = get_calendar( $initial, $echo );

Parameters

$initial

( bool ) optional default: 1 – Optional. Whether to use initial calendar names. Default true.

$echo

( bool ) optional default: 1 – Optional. Whether to display the calendar output. Default true.

Returns

void|string Void if $echo argument is true, calendar HTML if $echo is false.

Source

File name: wordpress/wp-includes/general-template.php
Lines:

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( (int) $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++ ) {
    $myweek[] = $wp_locale->get_weekday( ( $wdcount + $week_begins ) % 7 );
  }

  foreach ( $myweek as $wd ) {
    $day_name         = $initial ? $wp_locale->get_weekday_initial( $wd ) : $wp_locale->get_weekday_abbrev( $wd );
 

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