# polylang/trunk/src/Widgets/Calendar.php

Polylang, version trunk. 398 lines.

- Page: https://pluginprobe.com/plugins/polylang/trunk/code/src/Widgets/Calendar.php
- Raw: https://pluginprobe.com/plugins/polylang/trunk/raw/src/Widgets/Calendar.php
- Modified: 2026-09-28T09:50:00+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/polylang/trunk/code/src/Widgets/Calendar.php#L10-L20`.

```php
<?php
/**
 * @package Polylang
 */

namespace WP_Syntex\Polylang\Widgets;

if ( ! class_exists( 'WP_Widget_Calendar' ) ) {
	require_once ABSPATH . '/wp-includes/default-widgets.php';
}

/**
 * This classes rewrite the whole Calendar widget functionality as there is no filter on sql queries and only a filter on final output.
 * Code last checked: WP 7.2.
 *
 * A request to add filters on SQL queries exists: http://core.trac.wordpress.org/ticket/15202, closed in favor of https://core.trac.wordpress.org/ticket/29319.
 * Method used in 0.4.x: use of the get_calendar filter and overwrite the output of get_calendar function -> not very efficient (add 4 to 5 sql queries).
 * Method used since 0.5: remove the WP widget and replace it by our own -> our language filter will not work if get_calendar is called directly by a theme.
 *
 * @since 0.5
 */
class Calendar extends \WP_Widget_Calendar {
	protected static $pll_instance = 0; // Can't use $instance of WP_Widget_Calendar as it's private :/.

	/**
	 * Outputs the content for the current Calendar widget instance.
	 * Modified version of the parent function to call our own get_calendar() method.
	 *
	 * @since 0.5
	 *
	 * @param array $args     Display arguments including 'before_title', 'after_title',
	 *                        'before_widget', and 'after_widget'.
	 * @param array $instance The settings for the particular instance of the widget.
	 */
	public function widget( $args, $instance ) {
		$title = ! empty( $instance['title'] ) ? $instance['title'] : '';

		/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */
		$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );

		echo $args['before_widget'];
		if ( $title ) {
			echo $args['before_title'] . $title . $args['after_title'];
		}
		if ( 0 === self::$pll_instance ) { #modified#
			echo '<div id="calendar_wrap" class="calendar_wrap">';
		} else {
			echo '<div class="calendar_wrap">';
		}
		empty( PLL()->curlang ) ? get_calendar() : self::get_calendar(); #modified#
		echo '</div>';
		echo $args['after_widget'];

		++self::$pll_instance; #modified#
	}

	/**
	 * Modified version of the WP `get_calendar()` function to filter the queries.
	 *
	 * @since 0.5
	 * @since 3.8 New argument $args added, with backward compatibility (WP 6.8).
	 *
	 * @param array $args {
	 *     Optional. Arguments for the `get_calendar` function.
	 *
	 *     @type bool   $initial   Whether to use initial calendar names. Default true.
	 *     @type bool   $display   Whether to display the calendar output. Default true.
	 *     @type string $post_type Optional. Post type. Default 'post'.
	 * }
	 * @return string|void Calendar HTML when `$display` is false, null when the site has
	 *                     no posts. Nothing otherwise.
	 * @phpstan-return ( $args is array{ display: false|0|''|'0', ... } ? string|null : void )
	 */
	public static function get_calendar( $args = array() ) {
		global $wpdb, $m, $monthnum, $year, $wp_locale, $posts;

		$defaults = array(
			'initial'   => true,
			'display'   => true,
			'post_type' => 'post',
		);

		$original_args = func_get_args();
		$args          = array();

		if ( ! empty( $original_args ) ) {
			if ( ! is_array( $original_args[0] ) ) {
				if ( isset( $original_args[0] ) && is_bool( $original_args[0] ) ) {
					$defaults['initial'] = $original_args[0];
				}
				if ( isset( $original_args[1] ) && is_bool( $original_args[1] ) ) {
					$defaults['display'] = $original_args[1];
				}
			} else {
				$args = $original_args[0];
			}
		}

		/** This filter is documented in wp-includes/general-template.php */
		$args = apply_filters( 'get_calendar_args', wp_parse_args( $args, $defaults ) );

		$args['lang'] = PLL()->curlang->slug; #added#

		if ( ! post_type_exists( $args['post_type'] ) ) {
			$args['post_type'] = 'post';
		}

		$w = 0;
		if ( isset( $_GET['w'] ) ) {
			$w = (int) $_GET['w'];
		}

		/*
		 * Normalize the cache key.
		 *
		 * The following ensures the same cache key is used for the same parameter
		 * and parameter equivalents. This prevents `post_type > post, initial > true`
		 * from generating a different key from the same values in the reverse order.
		 *
		 * `display` is excluded from the cache key as the cache contains the same
		 * HTML regardless of this function's need to echo or return the output.
		 *
		 * The global values contain data generated by the URL query string variables.
		 */
		$cache_args = $args;
		unset( $cache_args['display'] );

		$cache_args['globals'] = array(
			'm'        => $m,
			'monthnum' => $monthnum,
			'year'     => $year,
			'week'     => $w,
		);

		wp_recursive_ksort( $cache_args );
		$key   = md5( serialize( $cache_args ) );
		$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 ], $args );

			if ( $args['display'] ) {
				echo $output;
				return;
			}

			return $output;
		}

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

		$post_type = $args['post_type'];

		// Quick check. If we have no posts at all, abort!
		if ( ! $posts ) {
			$gotsome = $wpdb->get_var(
				$wpdb->prepare(
					"SELECT 1 as test
					FROM $wpdb->posts
					WHERE post_type = %s
					AND post_status = 'publish'
					LIMIT 1",
					$post_type
				)
			);

			if ( ! $gotsome ) {
				$cache[ $key ] = '';
				wp_cache_set( 'get_calendar', $cache, 'calendar' );
				return null;
			}
		}

		// week_begins = 0 stands for Sunday.
		$week_begins = (int) get_option( 'start_of_week' );

		// Read the current date.
		list( $current_year, $current_month, $current_day ) = array_map( 'intval', explode( '-', current_time( 'Y-m-j' ) ) );

		// Let's figure out when we are.
		if ( ! empty( $monthnum ) && ! empty( $year ) ) {
			$thismonth = (int) $monthnum;
			$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 = (int) $wpdb->get_var(
				$wpdb->prepare(
					"SELECT DATE_FORMAT((DATE_ADD('%d0101', INTERVAL %d DAY) ), '%%m')",
					$thisyear,
					$d
				)
			);
		} elseif ( ! empty( $m ) ) {
			$thisyear = (int) substr( $m, 0, 4 );
			if ( strlen( $m ) < 6 ) {
				$thismonth = 1;
			} else {
				$thismonth = (int) substr( $m, 4, 2 );
			}
		} else {
			$thisyear  = $current_year;
			$thismonth = $current_month;
		}

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

		$join_clause  = PLL()->model->post->join_clause(); #added#
		$where_clause = PLL()->model->post->where_clause( PLL()->curlang ); #added#

		// Get the next and previous month and year with at least one post.
		$previous = $wpdb->get_row(
			$wpdb->prepare(
				"SELECT MONTH(post_date) AS month, YEAR(post_date) AS year
				FROM $wpdb->posts $join_clause
				WHERE post_date < '%d-%d-01'
				AND post_type = %s AND post_status = 'publish' $where_clause
				ORDER BY post_date DESC
				LIMIT 1",
				$thisyear,
				zeroise( $thismonth, 2 ),
				$post_type
			)
		);  #modified#

		$next = $wpdb->get_row(
			$wpdb->prepare(
				"SELECT MONTH(post_date) AS month, YEAR(post_date) AS year
				FROM $wpdb->posts $join_clause
				WHERE post_date > '%d-%d-%d 23:59:59'
				AND post_type = %s AND post_status = 'publish' $where_clause
				ORDER BY post_date ASC
				LIMIT 1",
				$thisyear,
				zeroise( $thismonth, 2 ),
				$last_day,
				$post_type
			)
		);  #modified#

		/* 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         = $args['initial'] ? $wp_locale->get_weekday_initial( $wd ) : $wp_locale->get_weekday_abbrev( $wd );
			$wd               = esc_attr( $wd );
			$calendar_output .= "\n\t\t<th scope=\"col\" aria-label=\"$wd\">$day_name</th>";
		}

		$calendar_output .= '
		</tr>
		</thead>
		<tbody>
		<tr>';

		$daywithpost = array();

		// Get days with posts.
		$dayswithposts = $wpdb->get_results(
			$wpdb->prepare(
				"SELECT DISTINCT DAYOFMONTH(post_date)
				FROM $wpdb->posts $join_clause WHERE post_date >= '%d-%d-01 00:00:00'
				AND post_type = %s AND post_status = 'publish'
				AND post_date <= '%d-%d-%d 23:59:59' $where_clause",
				$thisyear,
				zeroise( $thismonth, 2 ),
				$post_type,
				$thisyear,
				zeroise( $thismonth, 2 ),
				$last_day
			),
			ARRAY_N
		); #modified#

		if ( $dayswithposts ) {
			foreach ( (array) $dayswithposts as $daywith ) {
				$daywithpost[] = (int) $daywith[0];
			}
		}

		// See how much we should pad in the beginning.
		$pad = calendar_week_mod( (int) gmdate( 'w', $unixmonth ) - $week_begins );
		if ( $pad > 0 ) {
			$calendar_output .= "\n\t\t" . '<td colspan="' . esc_attr( $pad ) . '" class="pad">&nbsp;</td>';
		}

		$newrow      = false;
		$daysinmonth = (int) gmdate( 't', $unixmonth );

		for ( $day = 1; $day <= $daysinmonth; ++$day ) {
			if ( $newrow ) {
				$calendar_output .= "\n\t</tr>\n\t<tr>\n\t\t";
			}

			$newrow = false;

			if ( $current_day === $day
				&& $current_month === $thismonth
				&& $current_year === $thisyear
			) {
				$calendar_output .= '<td id="today">';
			} else {
				$calendar_output .= '<td>';
			}

			if ( in_array( $day, $daywithpost, true ) ) {
				// Any posts today?
				$date_format = gmdate( _x( 'F j, Y', 'daily archives date format' ), strtotime( "{$thisyear}-{$thismonth}-{$day}" ) );
				/* translators: Post calendar label. %s: Date. */
				$label            = sprintf( __( 'Posts published on %s' ), $date_format );
				$calendar_output .= sprintf(
					'<a href="%s" aria-label="%s">%s</a>',
					get_day_link( $thisyear, $thismonth, $day ),
					esc_attr( $label ),
					$day
				);
			} else {
				$calendar_output .= $day;
			}

			$calendar_output .= '</td>';

			if ( 6 === (int) calendar_week_mod( (int) gmdate( 'w', mktime( 0, 0, 0, $thismonth, $day, $thisyear ) ) - $week_begins ) ) {
				$newrow = true;
			}
		}

		$pad = 7 - calendar_week_mod( (int) gmdate( 'w', mktime( 0, 0, 0, $thismonth, $day, $thisyear ) ) - $week_begins );
		if ( 0 < $pad && $pad < 7 ) {
			$calendar_output .= "\n\t\t" . '<td class="pad" colspan="' . esc_attr( $pad ) . '">&nbsp;</td>';
		}

		$calendar_output .= "\n\t</tr>\n\t</tbody>";

		$calendar_output .= "\n\t</table>";

		$calendar_output .= '<nav aria-label="' . __( 'Previous and next months' ) . '" class="wp-calendar-nav">';

		if ( $previous ) {
			$calendar_output .= "\n\t\t" . sprintf(
				'<span class="wp-calendar-nav-prev"><a href="%1$s">&laquo; %2$s</a></span>',
				get_month_link( $previous->year, $previous->month ),
				$wp_locale->get_month_abbrev( $wp_locale->get_month( $previous->month ) )
			);
		} else {
			$calendar_output .= "\n\t\t" . '<span class="wp-calendar-nav-prev">&nbsp;</span>';
		}

		$calendar_output .= "\n\t\t" . '<span class="pad">&nbsp;</span>';

		if ( $next ) {
			$calendar_output .= "\n\t\t" . sprintf(
				'<span class="wp-calendar-nav-next"><a href="%1$s">%2$s &raquo;</a></span>',
				get_month_link( $next->year, $next->month ),
				$wp_locale->get_month_abbrev( $wp_locale->get_month( $next->month ) )
			);
		} else {
			$calendar_output .= "\n\t\t" . '<span class="wp-calendar-nav-next">&nbsp;</span>';
		}

		$calendar_output .= '
		</nav>';

		$cache[ $key ] = $calendar_output;
		wp_cache_set( 'get_calendar', $cache, 'calendar' );

		/** This filter is documented in wp-includes/general-template.php */
		$calendar_output = apply_filters( 'get_calendar', $calendar_output, $args );

		if ( $args['display'] ) {
			echo $calendar_output;
			return;
		}

		return $calendar_output;
	}
}

```