
get_calendar ( $initial = true, $echo = true )
get_calendar: 此函数返回当前月份的文章日历: 该函数接受一组参数,指定要显示的日历类型(例如,有或没有文章链接),并返回表示日历的HTML字符串。
显示有文章作为链接的日子的日历。
日历是缓存的,如果它存在,将被检索。如果该月没有文章,那么它将不会被显示。
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 ); $wd = esc_attr( $wd ); $calendar_output .= "ntt<th scope="col" title="$wd">$day_name</th>"; } $calendar_output .= ' </tr> </thead> <tbody> <tr>'; $daywithpost = array(); // Get days with posts. $dayswithposts = $wpdb->get_results( "SELECT DISTINCT DAYOFMONTH(post_date) FROM $wpdb->posts WHERE post_date >= '{$thisyear}-{$thismonth}-01 00:00:00' AND post_type = 'post' AND post_status = 'publish' AND post_date <= '{$thisyear}-{$thismonth}-{$last_day} 23:59:59'", ARRAY_N ); if ( $dayswithposts ) { foreach ( (array) $dayswithposts as $daywith ) { $daywithpost[] = (int) $daywith[0]; } } // See how much we should pad in the beginning. $pad = calendar_week_mod( gmdate( 'w', $unixmonth ) - $week_begins ); if ( 0 != $pad ) { $calendar_output .= "ntt" . '<td colspan="' . esc_attr( $pad ) . '" class="pad"> </td>'; } $newrow = false; $daysinmonth = (int) gmdate( 't', $unixmonth ); for ( $day = 1; $day <= $daysinmonth; ++$day ) { if ( isset( $newrow ) && $newrow ) { $calendar_output .= "nt</tr>nt<tr>ntt"; } $newrow = false; if ( current_time( 'j' ) == $day && current_time( 'm' ) == $thismonth && current_time( 'Y' ) == $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 == calendar_week_mod( gmdate( 'w', mktime( 0, 0, 0, $thismonth, $day, $thisyear ) ) - $week_begins ) ) { $newrow = true; } } $pad = 7 - calendar_week_mod( gmdate( 'w', mktime( 0, 0, 0, $thismonth, $day, $thisyear ) ) - $week_begins ); if ( 0 != $pad && 7 != $pad ) { $calendar_output .= "ntt" . '<td class="pad" colspan="' . esc_attr( $pad ) . '"> </td>'; } $calendar_output .= "nt</tr>nt</tbody>"; $calendar_output .= "nt</table>"; $calendar_output .= '<nav aria-label="' . __( 'Previous and next months' ) . '" class="wp-calendar-nav">'; if ( $previous ) { $calendar_output .= "ntt" . '<span class="wp-calendar-nav-prev"><a href="' . get_month_link( $previous->year, $previous->month ) . '">« ' . $wp_locale->get_month_abbrev( $wp_locale->get_month( $previous->month ) ) . '</a></span>'; } else { $calendar_output .= "ntt" . '<span class="wp-calendar-nav-prev"> </span>'; } $calendar_output .= "ntt" . '<span class="pad"> </span>'; if ( $next ) { $calendar_output .= "ntt" . '<span class="wp-calendar-nav-next"><a href="' . get_month_link( $next->year, $next->month ) . '">' . $wp_locale->get_month_abbrev( $wp_locale->get_month( $next->month ) ) . ' »</a></span>'; } else { $calendar_output .= "ntt" . '<span class="wp-calendar-nav-next"> </span>'; } $calendar_output .= ' </nav>'; $cache[ $key ] = $calendar_output; wp_cache_set( 'get_calendar', $cache, 'calendar' ); if ( $echo ) { /** * Filters the HTML calendar output. * * @since 3.0.0 * * @param string $calendar_output HTML output of the calendar. */ echo apply_filters( 'get_calendar', $calendar_output ); return; } /** This filter is documented in wp-includes/general-template.php */ return apply_filters( 'get_calendar', $calendar_output ); }
钩子函数和过滤器函数的主要区别是它们的行为方式。钩子函数是在特定的时间点被调用的函数,它们可以执行各种任务,但通常不会返回值。而过滤器函数则是对特定的值进行过滤和修改的函数,它们会接收一个值作为输入,然后返回一个新的值作为输出。
钩子函数(Hooks)和过滤器函数(Filters)是用于修改和扩展WordPress(和其他编程环境)功能的核心概念。它们的主要区别在于它们的用途和工作方式。
1. 钩子函数(Hooks):
2. 过滤器函数(Filters):
主要区别在于它们的目的和使用场景:
重要的是要理解钩子函数和过滤器函数在编程环境中的作用,以便正确使用它们来实现自定义功能和修改数据。
apply_filters
函数用于调用一个钩子上的所有过滤器函数。它的基本用法如下:
$value = apply_filters( 'hook_name', $value, $var1, $var2, ... );
其中:
'hook_name
' 是你要应用过滤器函数的钩子名称。
$value
是你要传递给过滤器函数的值。
$var1, $var2, …
是你要传递给过滤器函数的其他参数。
常量的命名有一些约定和规则。首先,常量的名称应该全部大写,用下划线分隔单词。例如,MY_CONSTANT_NAME
。其次,常量的名称应该是有意义的,能够清晰地描述常量的用途或值。最后,避免使用已经被PHP或WordPress定义的常量名称,以避免冲突。
在WordPress中,常量的命名规则和约定如下:
ABSPATH
。WP_DEBUG
.WP_
,例如: WP_CONTENT_DIR
。例如,以下是符合WordPress常量命名规则的示例:
define( 'WP_DEBUG', true ); define( 'WP_CONTENT_DIR', '/var/www/html/wp-content' ); define( 'MY_CUSTOM_CONSTANT', 'Hello World' );
遵循这些命名规则和约定可以帮助保持代码的一致性和可读性,使得WordPress主题或插件更易于理解、维护和扩展。
要使用WordPress REST API,可以按照以下步骤进行操作:
这些是使用WordPress REST API的基本步骤。你可以根据具体需求进行深入学习和实践,探索更多可用的终点和功能。对于详细的API文档和参考,请查阅WordPress官方文档或REST API官方手册。
在WordPress中,钩子函数可以在以下几个地方使用:
add_filter()
`函数注册在特定过滤器(filter hooks)上执行的钩子函数。add_action()
`函数在特定的动作点上添加自定义内容,或使用` add_filter()
`函数修改主题函数的输出。functions.php
`的文件,用于添加自定义功能和修改WordPress行为。该文件中可以使用钩子函数来注册特定的动作点和过滤器,并添加相应的钩子函数来处理这些事件。do_action()
`或` apply_filters()
`函数调用,然后在需要的地方注册相应的钩子函数。总结起来,WordPress中的钩子函数可以在插件、主题、自定义功能文件以及WordPress核心文件中使用,用于注册和处理特定的WordPress事件或动作。这允许开发者在这些地方插入自定义逻辑,以实现个性化的功能和修改WordPress的行为。
wp_insert_post()
函数用于插入新的文章。你需要传递一个关联数组,包含文章的各项参数,如标题、内容、分类等。例如:
$post_data = array( 'post_title' => '新的文章', 'post_content' => '这是一篇新的文章。', 'post_status' => 'publish', // 设置为 'publish' 以立即发布文章 'post_type' => 'post', // 也可以设置为 'page' 或其他自定义的文章类型 ); $post_id = wp_insert_post($post_data);
如果你想要插入更复杂的文章,例如包含多个分类或标签,你可以在 $post_data
数组中添加更多的键值对。