Location: PHPKode > scripts > Polylang > polylang/include/calendar.php
<?php
// obliged to rewrite the whole WordPress function as there is no filter on sql queries and only a filter on final output
// a request for making a filter on sql queries exists: http://core.trac.wordpress.org/ticket/15202
// 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)
// 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

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

class Polylang_Widget_Calendar extends WP_Widget_Calendar {

	function widget( $args, $instance ) {
		global $polylang; #added#

		extract($args);
		$title = apply_filters('widget_title', empty($instance['title']) ? '&nbsp;' : $instance['title'], $instance, $this->id_base);
		echo $before_widget;
		if ( $title )
			echo $before_title . $title . $after_title;
		echo '<div id="calendar_wrap">';
		isset($polylang) && $polylang->get_languages_list() && $polylang->get_current_language() ? $this->get_calendar() : get_calendar(); #modified#
		echo '</div>';
		echo $after_widget;
	}

	// modified version of WP get_calendar function to filter the query
	function get_calendar($initial = true, $echo = true) {
		global $wpdb, $m, $monthnum, $year, $wp_locale, $posts;
		global $polylang; #added#

		$lang = $polylang->get_current_language()->term_taxonomy_id; #added#

		$cache = array();
		$key = md5( $lang . $m . $monthnum . $year ); #modified#
		if ( $cache = wp_cache_get( 'get_calendar', 'calendar' ) ) {
			if ( is_array($cache) && isset( $cache[ $key ] ) ) {
				if ( $echo ) {
					echo apply_filters( 'get_calendar',  $cache[$key] );
					return;
				} else {
					return apply_filters( 'get_calendar',  $cache[$key] );
				}
			}
		}

		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']) )
			$w = ''.intval($_GET['w']);

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

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

		$unixmonth = mktime(0, 0 , 0, $thismonth, 1, $thisyear);
		$last_day = date('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
			INNER JOIN $wpdb->term_relationships AS tr ON tr.object_id = ID
			WHERE post_date < '$thisyear-$thismonth-01'
			AND post_type = 'post' AND post_status = 'publish' AND tr.term_taxonomy_id = $lang
				ORDER BY post_date DESC
				LIMIT 1"); #modified#
		$next = $wpdb->get_row("SELECT MONTH(post_date) AS month, YEAR(post_date) AS year
			FROM $wpdb->posts
			INNER JOIN $wpdb->term_relationships AS tr ON tr.object_id = ID
			WHERE post_date > '$thisyear-$thismonth-{$last_day} 23:59:59'
			AND post_type = 'post' AND post_status = 'publish' AND tr.term_taxonomy_id = $lang
				ORDER BY post_date ASC
				LIMIT 1"); #modified#

		/* translators: Calendar caption: 1: month name, 2: 4-digit year */
		$calendar_caption = _x('%1$s %2$s', 'calendar caption');
		$calendar_output = '<table id="wp-calendar">
		<caption>' . sprintf($calendar_caption, $wp_locale->get_month($thismonth), date('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 = (true == $initial) ? $wp_locale->get_weekday_initial($wd) : $wp_locale->get_weekday_abbrev($wd);
			$wd = esc_attr($wd);
			$calendar_output .= "\n\t\t<th scope=\"col\" title=\"$wd\">$day_name</th>";
		}

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

		<tfoot>
		<tr>';

		if ( $previous ) {
			$calendar_output .= "\n\t\t".'<td colspan="3" id="prev"><a href="' . get_month_link($previous->year, $previous->month) . '" title="' . esc_attr( sprintf(__('View posts for %1$s %2$s'), $wp_locale->get_month($previous->month), date('Y', mktime(0, 0 , 0, $previous->month, 1, $previous->year)))) . '">&laquo; ' . $wp_locale->get_month_abbrev($wp_locale->get_month($previous->month)) . '</a></td>';
		} else {
			$calendar_output .= "\n\t\t".'<td colspan="3" id="prev" class="pad">&nbsp;</td>';
		}

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

		if ( $next ) {
			$calendar_output .= "\n\t\t".'<td colspan="3" id="next"><a href="' . get_month_link($next->year, $next->month) . '" title="' . esc_attr( sprintf(__('View posts for %1$s %2$s'), $wp_locale->get_month($next->month), date('Y', mktime(0, 0 , 0, $next->month, 1, $next->year))) ) . '">' . $wp_locale->get_month_abbrev($wp_locale->get_month($next->month)) . ' &raquo;</a></td>';
		} else {
			$calendar_output .= "\n\t\t".'<td colspan="3" id="next" class="pad">&nbsp;</td>';
		}

		$calendar_output .= '
		</tr>
		</tfoot>

		<tbody>
		<tr>';

		// Get days with posts
		$dayswithposts = $wpdb->get_results("SELECT DISTINCT DAYOFMONTH(post_date)
			FROM $wpdb->posts
			INNER JOIN $wpdb->term_relationships AS tr ON tr.object_id = ID
			WHERE post_date >= '{$thisyear}-{$thismonth}-01 00:00:00'
			AND post_type = 'post' AND post_status = 'publish' AND tr.term_taxonomy_id = $lang
			AND post_date <= '{$thisyear}-{$thismonth}-{$last_day} 23:59:59'", ARRAY_N); #modified#
		if ( $dayswithposts ) {
			foreach ( (array) $dayswithposts as $daywith ) {
				$daywithpost[] = $daywith[0];
			}
		} else {
			$daywithpost = array();
		}

		if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false || stripos($_SERVER['HTTP_USER_AGENT'], 'camino') !== false || stripos($_SERVER['HTTP_USER_AGENT'], 'safari') !== false)
			$ak_title_separator = "\n";
		else
			$ak_title_separator = ', ';

		$ak_titles_for_day = array();
		$ak_post_titles = $wpdb->get_results("SELECT ID, post_title, DAYOFMONTH(post_date) as dom "
			."FROM $wpdb->posts "
			."INNER JOIN $wpdb->term_relationships AS tr ON tr.object_id = ID "
			."WHERE post_date >= '{$thisyear}-{$thismonth}-01 00:00:00' "
			."AND post_date <= '{$thisyear}-{$thismonth}-{$last_day} 23:59:59' "
			."AND post_type = 'post' AND post_status = 'publish' AND tr.term_taxonomy_id = $lang"
		); #modified#
		if ( $ak_post_titles ) {
			foreach ( (array) $ak_post_titles as $ak_post_title ) {

				$post_title = esc_attr( apply_filters( 'the_title', $ak_post_title->post_title, $ak_post_title->ID ) );

				if ( empty($ak_titles_for_day['day_'.$ak_post_title->dom]) )
					$ak_titles_for_day['day_'.$ak_post_title->dom] = '';
				if ( empty($ak_titles_for_day["$ak_post_title->dom"]) ) // first one
					$ak_titles_for_day["$ak_post_title->dom"] = $post_title;
				else
					$ak_titles_for_day["$ak_post_title->dom"] .= $ak_title_separator . $post_title;
			}
		}

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

		$daysinmonth = intval(date('t', $unixmonth));
		for ( $day = 1; $day <= $daysinmonth; ++$day ) {
			if ( isset($newrow) && $newrow )
				$calendar_output .= "\n\t</tr>\n\t<tr>\n\t\t";
			$newrow = false;

			if ( $day == gmdate('j', current_time('timestamp')) && $thismonth == gmdate('m', current_time('timestamp')) && $thisyear == gmdate('Y', current_time('timestamp')) )
				$calendar_output .= '<td id="today">';
			else
				$calendar_output .= '<td>';

			if ( in_array($day, $daywithpost) ) // any posts today?
				$calendar_output .= '<a href="' . get_day_link( $thisyear, $thismonth, $day ) . '" title="' . esc_attr( $ak_titles_for_day[ $day ] ) . "\">$day</a>";
			else
				$calendar_output .= $day;
			$calendar_output .= '</td>';

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

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

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

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

		if ( $echo )
			echo apply_filters( 'get_calendar',  $calendar_output );
		else
			return apply_filters( 'get_calendar',  $calendar_output );
	}
}
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