WordPress常用函数

循环函数

循环开始

<?php query_posts(\'showposts=4&cat=4\');?>

//showposts=4 输出四篇文章， cat=4代表 ID=4,还可以接orderby等参数

<?php if ( have_posts() ) :?>

<?php $i=1; while ( have_posts() ) : the_post();?>

循环内容

<?phpthe_permalink()?> 文章链接

<?phpthe_title()?> 文章标题

<?phpecho catch_that_image()?> 获取文章图片，不能单独用，需配合function函数

<?phpechomb_strimwidth(strip_tags(apply_filters(\'the_content\', $post->post_content)), 0, 100,\"...\");?>

获取文章前100个字符

<?phpthe_content()?> 文章内容

<?php

$views=(int)get_post_meta($post->ID,\'views\',true)

$add_views=(int)update_post_meta($post->ID,\'views\',$views+1);

$after_views=(int)get_post_meta($post->ID,\'views\',true);

if($after_views){

echo $after_views.\'次 |\';

}else{

echo\"没有统计浏览量！\";

}?>

获取文章浏览量

<?php the_time(‘Y-m-d’) ?> 文章发布时间

<?php the_author() ?>文章作者

<?php $author=get_post_meta($post->ID,\'author\',true);

if(!!$author){ echo $author;}

else{the_author()}

?>

循环结束

<?php$i++; endwhile;?>

<?phpendif;?>

<?phpwp_reset_query();?>

获取统计

日志总数：<?php $count_posts = wp_count_posts(); echo $published_posts =$count_posts->publish;?>篇

草稿总数：<?php $count_posts = wp_count_posts(); echo $draft_posts = $count_posts->draft; ?>

页面总数：<?php $count_pages = wp_count_posts(\'page\'); echo $page_posts = $count_pages->publish; ?>

用户总数：<?php $users = $wpdb->get_var(\"SELECT COUNT(ID) FROM $wpdb->users\"); echo $users; ?>

成立时间：<?php echo floor((time()-strtotime(\"2016-8-23\"))/86400); ?> //其中的年月日改成你自己的网站成立时间

分类总数：<?php echo $count_categories = wp_count_terms(\'category\'); ?>个

标签总数：<?php echo $count_tags = wp_count_terms(\'post_tag\'); ?>个

友情链接：<?php $link = $wpdb->get_var(\"SELECT COUNT(*) FROM $wpdb->links WHERE link_visible = \'Y\'\"); echo $link; ?>个

网站运行：<?php echo floor((time()-strtotime(\"2016-7-27\"))/86400); ?>天

最后更新：<?php $last = $wpdb->get_results(\"SELECT MAX(post_modified) AS MAX_m FROM $wpdb->posts WHERE (post_type = \'post\' OR post_type = \'page\') AND (post_status = \'publish\' OR post_status = \'private\')\");$last = date(\'Y年n月j日\', strtotime($last[0]->MAX_m));echo $last; ?>

访客量：<?php

$counterFile = \"counter.txt\";

$fp = fopen($counterFile,\"a+\");

$num = fgets($fp,5);

$num += 1;

print \"您是第 \".\"$num\".\" 位访客\";

fclose($fp);

$fpp=fopen($counterFile,\"w\");

fwrite($fpp, $num);

fclose($fpp);

?>

调用页面内容

<?php $my_id = 115; echo get_post($my_id)->post_content; ?>

<?php $my_id = 115; $mypage = get_post($my_id); ?>

<h2><?php echo $mypage->post_title;?></h2> <?php echo substr($mypage->post_content,0,strpos($mypage->post_content, \'<!--more-->\'));?>

Function主函数常用示例

//添加菜单功能

if (function_exists(\'add_theme_support\')) {

add_theme_support(\'nav-menus\');

register_nav_menus( array(

\'primary\'=> __(\'Primary Navigation\',\'primary\'),

\'slide-menus\'=>__(\'Slide Menus\',\'slide\'),

\'footer-menus\'=>__(\'Footer Menus\',\'footer\')

) );

}

//在Function.php里面加入一段获取首张图片的函数：

function catch_that_image() {

global $post, $posts;

$first_img =\'\';

ob_start();

ob_end_clean();

$output = preg_match_all(\'/<img.+src=[\\\'\"]([^\\\'\"]+)[\\\'\"].*>/i\', $post->post_content, $matches);

$first_img = $matches [1] [0];

// if(empty($first_img)){

// $first_img = get_bloginfo(\'template_directory\').\"/img/default.jpg\";

// }

return $first_img;

}

//在Function.php里面加入一段更改登录页面LOGO：

function custom_loginlogo() {

echo\'<style type=\"text/css\">.login h1 a {background-image: url(\'.get_bloginfo(\'template_directory\').\'/img/login_logo.png) !important; }</style>\';

}add_action(\'login_head\',\'custom_loginlogo\');

//在Function.php里面加入一段禁用更新：

add_action(\'admin_menu\',\'wp_hide_nag\');

function wp_hide_nag() {

remove_action(\'admin_notices\',\'update_nag\', 3 );

}

// 添加菜单

function addmenu_function(){

add_menu_page( \'成绩上传\', \'成绩上传\', \'edit_themes\', \'upsql_point\',\'uppoint_function\',\'\',6);

}

//添加面包屑导航

function cmp_breadcrumbs() {

$delimiter =\'>\';// 分隔符

$before =\'<span>\';// 在当前链接前插入

$after =\'</span>\';// 在当前链接后插入

if ( !is_home() && !is_front_page() || is_paged() ) {

echo\'<div>\'.__(\'当前位置:\',\'cmp\');

global $post;

$homeLink = home_url();

echo\' <a href=\"\'. $homeLink .\'\">\'. __(\'未济首页\',\'cmp\') .\'</a> \'. $delimiter .\' \';

if ( is_category() ) {// 分类 存档

global $wp_query;

$cat_obj = $wp_query->get_queried_object();

$thisCat = $cat_obj->term_id;

$thisCat = get_category($thisCat);

$parentCat = get_category($thisCat->parent);

if ($thisCat->parent != 0){

$cat_code = get_category_parents($parentCat, TRUE,\' \'. $delimiter .\' \');

echo $cat_code = str_replace (\'<a\',\'<a itemprop=\"breadcrumb\"\', $cat_code );

}

echo $before .\'\'. single_cat_title(\'\', false) .\'\'. $after;

} elseif ( is_day() ) {// 天 存档

echo\'<a href=\"\'. get_year_link(get_the_time(\'Y\')) .\'\">\'. get_the_time(\'Y\') .\'</a> \'. $delimiter .\' \';

echo\'<a href=\"\'. get_month_link(get_the_time(\'Y\'),get_the_time(\'m\')) .\'\">\'. get_the_time(\'F\') .\'</a> \'. $delimiter .\' \';

echo $before . get_the_time(\'d\') . $after;

} elseif ( is_month() ) {// 月 存档

echo\'<a href=\"\'. get_year_link(get_the_time(\'Y\')) .\'\">\'. get_the_time(\'Y\') .\'</a> \'. $delimiter .\' \';

echo $before . get_the_time(\'F\') . $after;

} elseif ( is_year() ) {// 年 存档

echo $before . get_the_time(\'Y\') . $after;

} elseif ( is_single() && !is_attachment() ) {// 文章

if ( get_post_type() !=\'post\') {// 自定义文章类型

$post_type = get_post_type_object(get_post_type());

$slug = $post_type->rewrite;

echo\'<a href=\"\'. $homeLink .\'/\'. $slug[\'slug\'] .\'/\">\'. $post_type->labels->singular_name .\'</a> \'. $delimiter .\' \';

echo $before . get_the_title() . $after;

} else {// 文章 post

$cat = get_the_category(); $cat = $cat[0];

$cat_code = get_category_parents($cat, TRUE,\' \'. $delimiter .\' \');

echo $cat_code = str_replace (\'<a\',\'<a \', $cat_code );

echo $before . get_the_title() . $after;

}

} elseif ( !is_single() && !is_page() && get_post_type() !=\'post\') {

$post_type = get_post_type_object(get_post_type());

echo $before . $post_type->labels->singular_name . $after;

} elseif ( is_attachment() ) {// 附件

$parent = get_post($post->post_parent);

$cat = get_the_category($parent->ID); $cat = $cat[0];

echo\'<a href=\"\'. get_permalink($parent) .\'\">\'. $parent->post_title .\'</a> \'. $delimiter .\' \';

echo $before . get_the_title() . $after;

} elseif ( is_page() && !$post->post_parent ) {// 页面

echo $before . get_the_title() . $after;

} elseif ( is_page() && $post->post_parent ) {// 父级页面

$parent_id = $post->post_parent;

$breadcrumbs = array();

while ($parent_id) {

$page = get_page($parent_id);

$breadcrumbs[] =\'<a href=\"\'. get_permalink($page->ID) .\'\">\'. get_the_title($page->ID) .\'</a>\';

$parent_id = $page->post_parent;

}

$breadcrumbs = array_reverse($breadcrumbs);

foreach ($breadcrumbs as $crumb) echo $crumb .\' \'. $delimiter .\' \';

echo $before . get_the_title() . $after;

} elseif ( is_search() ) {// 搜索结果

echo $before ;

printf( __(\'Search Results for: %s\',\'cmp\'), get_search_query() );

echo $after;

} elseif ( is_tag() ) {//标签 存档

echo $before ;

printf( __(\'Tag Archives: %s\',\'cmp\'), single_tag_title(\'\', false ) );

echo $after;

} elseif ( is_author() ) {// 作者存档

global $author;

$userdata = get_userdata($author);

echo $before ;

printf( __(\'Author Archives: %s\',\'cmp\'), $userdata->display_name );

echo $after;

} elseif ( is_404() ) {// 404 页面

echo $before;

_e(\'Not Found\',\'cmp\');

echo $after;

}

if ( get_query_var(\'paged\') ) {// 分页

if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() )

echo sprintf( __(\'( Page %s )\',\'cmp\'), get_query_var(\'paged\') );

}

echo\'</div>\';

}

}

WordPress判断是否为分类函数：is_category

WordPress函数is_category用于判断当前页面是否为分类页面，如果指定了$category参数，该函数将另外检查是否为指定的分类页面。

is_category( mixed $category = \\\'\\\' )

函数参数

$category

混合型，默认为空

可以传递分类ID、名称、别名或数组

函数使用示例

if(is_category( array( 9, \\\'blue-cheese\\\', \\\'Stinky Cheeses\\\' ) )) {//当前页面为分类页面，且ID为9，或别名为blue-cheese，或名称为Stinky Cheeses} else {//不为指定分类页面时输出}

扩展阅读

is_category()函数位于：wp-includes/query.php

相关函数：

• is_archive()
• is_tax()
• is_tag()