WordPress Version: 3.9
/**
* 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
* @uses calendar_week_mod()
*
* @param bool $initial Optional, default is true. Use initial calendar names.
* @param bool $echo Optional, default is true. Set to false for return.
* @return string|null String when retrieving, null when displaying.
*/
function get_calendar($initial = true, $echo = true)
{
global $wpdb, $m, $monthnum, $year, $wp_locale, $posts;
$cache = array();
$key = md5($m . $monthnum . $year);
if ($cache = wp_cache_get('get_calendar', 'calendar')) {
if (is_array($cache) && isset($cache[$key])) {
if ($echo) {
/** This filter is documented in wp-includes/general-template.php */
echo apply_filters('get_calendar', $cache[$key]);
return;
} else {
/** This filter is documented in wp-includes/general-template.php */
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 = $wpdb->get_row("SELECT MONTH(post_date) AS month, YEAR(post_date) AS year\n\t\tFROM {$wpdb->posts}\n\t\tWHERE post_date < '{$thisyear}-{$thismonth}-01'\n\t\tAND post_type = 'post' AND post_status = 'publish'\n\t\t\tORDER BY post_date DESC\n\t\t\tLIMIT 1");
$next = $wpdb->get_row("SELECT MONTH(post_date) AS month, YEAR(post_date) AS year\n\t\tFROM {$wpdb->posts}\n\t\tWHERE post_date > '{$thisyear}-{$thismonth}-{$last_day} 23:59:59'\n\t\tAND post_type = 'post' AND post_status = 'publish'\n\t\t\tORDER BY post_date ASC\n\t\t\tLIMIT 1");
/* translators: Calendar caption: 1: month name, 2: 4-digit year */
$calendar_caption = _x('%1$s %2$s', 'calendar caption');
$calendar_output = '<table id="wp-calendar">
<caption>' . sprintf($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)))) . '">« ' . $wp_locale->get_month_abbrev($wp_locale->get_month($previous->month)) . '</a></td>';
} else {
$calendar_output .= "\n\t\t" . '<td colspan="3" id="prev" class="pad"> </td>';
}
$calendar_output .= "\n\t\t" . '<td class="pad"> </td>';
if ($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)) . ' »</a></td>';
} else {
$calendar_output .= "\n\t\t" . '<td colspan="3" id="next" class="pad"> </td>';
}
$calendar_output .= '
</tr>
</tfoot>
<tbody>
<tr>';
// Get days with posts
$dayswithposts = $wpdb->get_results("SELECT DISTINCT DAYOFMONTH(post_date)\n\t\tFROM {$wpdb->posts} WHERE post_date >= '{$thisyear}-{$thismonth}-01 00:00:00'\n\t\tAND post_type = 'post' AND post_status = 'publish'\n\t\tAND post_date <= '{$thisyear}-{$thismonth}-{$last_day} 23:59:59'", ARRAY_N);
if ($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} " . "WHERE post_date >= '{$thisyear}-{$thismonth}-01 00:00:00' " . "AND post_date <= '{$thisyear}-{$thismonth}-{$last_day} 23:59:59' " . "AND post_type = 'post' AND post_status = 'publish'");
if ($ak_post_titles) {
foreach ((array) $ak_post_titles as $ak_post_title) {
/** This filter is documented in wp-includes/post-template.php */
$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"> </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) . '"> </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) {
/**
* Filter the HTML calendar output.
*
* @since 3.0.0
*
* @param string $calendar_output HTML output of the calendar.
*/
echo apply_filters('get_calendar', $calendar_output);
} else {
/** This filter is documented in wp-includes/general-template.php */
return apply_filters('get_calendar', $calendar_output);
}
}