WordPress主题开发，从入门到精通。

<?php get_template_part( 'partials/content', 'page' ); ?>

<?php
/*注册样式*/
wp_enqueue_style( string $handle（样式名）, string $src = ''（样式文件的目录路径）, string[] $deps = array()（依赖的文件）, string|bool|null $ver = false（动态版本号）, string $media = 'all' （支持的媒体类型）)；按照注册的队列加载css文件。
/*注册脚本*/
wp_enqueue_script( string $handle, string $src = '', string[] $deps = array(), string|bool|null $ver = false, bool $in_footer = false )
/*内联样式*/
wp_add_inline_style()
/*内联脚本*/
wp_add_inline_script()

<?php
    query_posts("showposts=10");
    while (have_posts()) {
        the_post();//移动文字指定到此处
        get_the_permalink();
        get_the_title(); 
        get_the_title();
    }
    wp_reset_query(); //重置文章指指针
?>

<?php
/* 检索10条最新的指定类型的文章 */
$args = array(
  'numberposts' => 10,
  'post_type'   => 'book'
);
 
$latest_books = get_posts( $args );

<?php
//获取当前页码，默认值返回1
$page = get_query_var( 'page', 1 );  

update_user_meta( int $user_id, string $meta_key, mixed $meta_value, mixed $prev_value = '' )；

<?php
   get_avatar_url( $adminUserInfo->ID )

<?php 
     wp_is_mobile();

<?php

//访问分类或者标签时返回分类和标签的wp_term对象
$term = get_queried_object();

<?php
add_action( 'admin_init', 'my_tinymce_button' );

/*后台初始化*/
function my_tinymce_button() {
	if ( current_user_can( 'edit_posts' ) && current_user_can( 'edit_pages' ) ) {
                /* 编辑器新增上方按钮的勾子*/
		add_filter( 'mce_buttons', 'my_register_tinymce_button' ); 
                /* 编辑器新增插件的勾子*/   
                add_filter( 'mce_external_plugins', 'my_add_tinymce_button' );
	}
}
function my_register_tinymce_button( $buttons ) {
      /*每一个按钮代表一个插件的JS类（插件）*/
      /*JS类里指定功能和图标*/
        $buttons[] = 'success';
        $buttons[] = 'alert';
        $buttons[] = 'error';
        $buttons[] = 'h1';
        $buttons[] = 'h2';
        $buttons[] = 'h3';
        $buttons[] = 'code';
        $buttons[] = 'lightbox';
        $buttons[] = 'mark';
	return $buttons;
}
function my_add_tinymce_button( $plugin_array ) {
	$plugin_array['my_button_script'] = plugins_url( '/mybuttons.js', __FILE__ );/*指定要加载的插件*/
	return $plugin_array;
}

 /* 编辑器新增样式的勾子*/
add_filter( 'mce_css', 'pure_highlightjs_mce_css' ); /* 样式新增的勾子*/
function pure_highlightjs_mce_css( $mce_css ) {
	if ( ! is_array( $mce_css ) ) {
		$mce_css = explode( ',', $mce_css );
	}
	$mce_css[] = PURE_HIGHLIGHTJS_PLUGIN_URL . 'tinymce/tinymce.css';
	return implode( ',', $mce_css );
}

/* 标题标签 */
function nrtitle($atts, $content = null, $code = "")
{
    static $times=1;
    $return = '<h2 id="list'.$times.'">';
    $return .= $content;
    $return .= '</h2>';
    $times++;
    return $return;
}

add_shortcode('title', 'nrtitle');

<?php
if ( has_post_thumbnail() ) {
    the_post_thumbnail();
}

//样式加载
wp_enqueue_style('main-styles', get_template_directory_uri() . '/css/style.css', array(), filemtime(get_template_directory() . '/css/style.css'), false);
//脚本加载
wp_enqueue_script('prism', $url . '/common/prism/prism.js', array(), filemtime($root . '/common/prism/prism.js'), false);

<?php
global $wp_filter;
print_r($wp_filter);

function initialize(){

    /*
     * 去除头部多余无用的东西
     * */
    remove_action('wp_enqueue_scripts', 'wp_enqueue_global_styles'); //内联样式
    remove_action('wp_footer', 'wp_enqueue_global_styles', 1);//dobate图标
    remove_action('wp_head', 'wp_generator'); //移除WordPress版本
    remove_action('wp_head', 'rsd_link'); //移除离线编辑器开放接口
    remove_action('wp_head', 'wlwmanifest_link'); //移除离线编辑器开放接口
    remove_action('wp_head', 'index_rel_link'); //去除本页唯一链接信息
    remove_action('wp_head', 'parent_post_rel_link', 10, 0); //清除前后文信息
    remove_action('wp_head', 'start_post_rel_link', 10, 0); //清除前后文信息
    remove_action('wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0); //清除前后文信息
    remove_action('wp_head', 'feed_links', 2); //移除feed
    remove_action('wp_head', 'feed_links_extra', 3); //移除feed
    remove_action('wp_head', 'rest_output_link_wp_head', 10); //移除wp-json链
    remove_action('wp_head', 'print_emoji_detection_script', 7); //头部的JS代码
    //remove_action( 'wp_head', 'wp_print_styles', 8 ); //emoji载入css
    remove_action('wp_head', 'rel_canonical'); //rel=canonical
    remove_action('wp_head', 'wp_shortlink_wp_head', 10, 0); //rel=shortlink

    /*移除emjoy*/
    remove_action('wp_head', 'print_emoji_detection_script', 7);
    remove_action('admin_print_scripts', 'print_emoji_detection_script');
    remove_action('wp_print_styles', 'print_emoji_styles');
    remove_action('admin_print_styles', 'print_emoji_styles');
    remove_filter('the_content_feed', 'wp_staticize_emoji');
    remove_filter('comment_text_rss', 'wp_staticize_emoji');
    remove_filter('wp_mail', 'wp_staticize_emoji_for_email');

    /*移除文章内的embed内容*/
    remove_action('wp_head', 'wp_oembed_add_discovery_links');
    remove_action('wp_head', 'wp_oembed_add_host_js');


    add_filter('wp_resource_hints', //移除WordPress头部加载DNS预获取（dns-prefetch）
        function ($hints, $relation_type) {
            if ('dns-prefetch' === $relation_type) {
                return array_diff(wp_dependencies_unique_hosts(), $hints);
            }

            return $hints;
        }, 10, 2); //头部加载DNS预获取（dns-prefetch）

}
add_action('after_setup_theme', 'initialize'); //去除博客无用代码

//禁止Gutenberg编辑器
add_filter('use_block_editor_for_post', '__return_false');
remove_action( 'wp_enqueue_scripts', 'wp_common_block_scripts_and_styles' );

//禁止新版小工具
add_filter( 'gutenberg_use_widgets_block_editor', '__return_false' );
add_filter( 'use_widgets_block_editor', '__return_false');

editor.addButton('PureHighlightjsInsert', {
	title : PureHighlightjsTrans.title,
	icon: 'wp_code',
	onclick: function() {
		editor.windowManager.open({
			title : PureHighlightjsTrans.title,
			minWidth : 700,
			body : [
				{
					type : 'listbox',
					name : 'lang',
					label : PureHighlightjsTrans.language,
					values : languageValues
				},
				{
					type : 'textbox',
					name : 'code',
					label : PureHighlightjsTrans.code,
					multiline : true,
					minHeight : 200
				}
			],
			onsubmit : function(e){
				var code = e.data.code.replace(/\r\n/gmi, '\n'),
					tag = 'code';

				code =  tinymce.html.Entities.encodeAllRaw(code);

				var sp = (e.data.addspaces ? ' ' : '');

				editor.insertContent(sp + '<pre class="pure-highlightjs"><code class="' + e.data.lang + '">' + code + '\n</code></pre>' + sp + '<p></p>');
			}
		});
	}
});

tinymce.create('tinymce.plugins.info', {
	init : function(ed, url) {
		ed.addButton('info', {
			title : '蓝色背景栏',
			image : url+'/images/info.png',
			onclick : function() {
				 ed.selection.setContent('[info]' + ed.selection.getContent() + '[/info]');
			}
		});
	},
	createControl : function(n, cm) {
		return null;
	},
});
tinymce.PluginManager.add('info', tinymce.plugins.info);

if ( version_compare( $GLOBALS['wp_version'], '5.3', '<' ) ) {}	

function remove_footer( $text ) {
    $text = '';
    return $text;
}

/*
 * 删除WordPress后台底部版权信息、版本号
 * */
add_filter('update_footer', 'remove_footer', 11);
add_filter('admin_footer_text', 'remove_footer', 11);

/*
 * 替换Gravatar头像镜像站地址
 * */
function replace_https_avatar( $avatar ) {
    $Image = get_option( 'document_Gravatar' );
    //~ 替换为 https 的域名
    $avatar = str_replace( array(
        'secure.gravatar.com/avatar',
        "www.gravatar.com/avatar",
        "0.gravatar.com/avatar",
        "1.gravatar.com/avatar",
        "2.gravatar.com/avatar"
    ), $Image, $avatar );
    //~ 替换为 https 协议
    $avatar = str_replace( "http://", "https://", $avatar );

    return $avatar;
}

/*
 * 替换Gravatar镜像站地址
 * */
add_filter('get_avatar', 'replace_https_avatar');
add_filter('get_avatar_url', 'replace_https_avatar');

/*
 * 修改文字摘要字数
 * */
function article_excerpt_lengths( $length ) {
    return 300;
}

/*修改文章摘要的数量*/
add_filter( 'excerpt_length', 'article_excerpt_lengths', 999 );

/*
 * 添加后台可选的页面模板
 * */
function add_page_template( $page_templates ) {
    $page_templates['template/page/posts.php']='文章聚合';
    return $page_templates;
}
add_filter( 'theme_page_templates', 'add_page_template' );
add_filter( 'theme_post_templates', 'add_page_template' );

/*
 * 修改页面的固定链接
 * */
add_action( 'init', 'custom_page_rules' );
function custom_page_rules() {
    global $wp_rewrite;
    $wp_rewrite->page_structure = $wp_rewrite->root . '%pagename%.html';
}

<?php
$pagination = get_the_posts_pagination( array(
	'prev_next'          => false,
	'current'            => max( 1, get_query_var( 'paged' ) ),  //当前页码
	'type'               => 'list'
) );
/*去除多余的元素*/
$pagination=preg_replace( '/^[\s\S]*?(\<ul[\s\S]*\>[\s\S]*\<\/ul\>)[\s\S]*?$/', "$1", $pagination );

<?php if(get_comment_pages_count()>1){ ?>
        <div class="pagination">
            <?php paginate_comments_links( ['prev_next' => false]); ?>
        </div>
<?php } ?>

<?php
//是否登录
$isLogin = is_user_logged_in();
//用户信息
$Info    = wp_get_current_user();

<?php
/*
 * 主题功能
 * */
add_theme_support( 'post-thumbnails'); //开启主题缩略图
add_theme_support( 'menus'); //开启主题菜单功能
add_theme_support( 'widgets'); //开启自定义侧边栏
add_theme_support( 'widgets-block-editor'); //开启自定义侧边栏
remove_filter('the_content', 'wptexturize');  //关闭文章转义

<?php 
if ( have_posts() ) : 
    while ( have_posts() ) : the_post(); 
        // 显示文章内容
    endwhile; 
endif; 
?>

<?php
$defaults = array(
	'menu'                 => '',
	'container'            => 'div',
	'container_class'      => '',
	'container_id'         => '',
	'container_aria_label' => '',
	'menu_class'           => 'menu',
	'menu_id'              => '',
	'echo'                 => true,
	'fallback_cb'          => 'wp_page_menu',
	'before'               => '',
	'after'                => '',
	'link_before'          => '',
	'link_after'           => '',
	'items_wrap'           => '<ul id="%1$s" class="%2$s">%3$s</ul>',
	'item_spacing'         => 'preserve',
	'depth'                => 0,
	'walker'               => '',
	'theme_location'       => '',
);

<?php
// add top level menu
add_menu_page(page_title, menu_title, capability, handle, [function], [icon_url]);
// add sub-menu pages
add_submenu_page(parent, page_title, menu_title, capability, file/handle, [function]);
// add Options sub-menu
add_options_page(page_title, menu_title, capability, handle, [function]);
// add Management sub-menu
add_management_page(page_title, menu_title, capability, handle, [function]);
// add Pages sub-menu
add_pages_page( page_title, menu_title, capability, handle, [function]);
// add Posts sub-menu
add_posts_page( page_title, menu_title, capability, handle, [function]);
// add Appearances sub-menu
add_theme_page( page_title, menu_title, capability, handle, [function]); 

<?php
$wpdb -> get_results('query');  
$wpdb->query('query');  
$wpdb->get_var('query',column_offset,row_offset);  
$wpdb->get_row('query', output_type, row_offset);  
$wpdb->get_col('query',column_offset);  
$wpdb->get_results('query', output_type);  
$wpdb->insert( $table, $data, $format );  
$wpdb->update( $table, $data, $where, $format = null, $where_format = null );  
$wpdb->prepare( 'query' [, value_parameter, value_parameter ... ] );  
$wpdb->show_errors();  
$wpdb->hide_errors(); 
$wpdb->print_error();  
$wpdb->get_col_info('type', offset);  
$wpdb->flush();

MINUTE_IN_SECONDS  = 60 (seconds)
HOUR_IN_SECONDS    = 60 * MINUTE_IN_SECONDS
DAY_IN_SECONDS     = 24 * HOUR_IN_SECONDS
WEEK_IN_SECONDS    = 7 * DAY_IN_SECONDS
MONTH_IN_SECONDS   = 30 * DAY_IN_SECONDS
YEAR_IN_SECONDS    = 365 * DAY_IN_SECONDS

<?php

//加后一个参数时，判断用户对指定文章是否具有某种权限
current_user_can( 'edit_post', [$post_id ]); 

<?php
if ( author_can( $post, $capability ) ) {
// do something if the author of the post $post has $capability
}

<?php
add_role( $role_name, $display_name, $capabilities );
//例子
add_role( 'document_uploader', 'Document Uploader', array( 'organize_document' ) );

<?php
 remove_role([role_name] )://移除指定的角色

<?php
// get the "author" role object
$role = get_role( 'author' );
 
// add "organize_gallery" to this role object
$role->add_cap( 'organize_document');

$count_posts = wp_count_posts();
 
if ( $count_posts ) {
    $draft_posts = $count_posts->draft;
}

wp_count_terms('category'); //分类总数
wp_count_terms('post_tag'); //标签总数

$comment =  count(get_comments());//评论总数

<?php
   add_filter( 'cron_schedules',function($schedules){
	$schedules['nicen'] = array(
		'interval' => 3600,
		'display' => '定时任务'  //对于这个时间间隔的描述
	);
	return $schedules;	
   });

wp_schedule_event("初次触发时间","间隔触发时间","触发的action hook");

<?php

$request = wp_safe_remote_get( 'http://www.example.com/file.json' );

if ( is_wp_error( $request ) ) {
	return false;
}

$body = wp_remote_retrieve_body( $request );
$json = json_decode( $body );

<?php

wp_remote_get($url,$args);

$url – 从中检索数据的资源。这必须是标准的 HTTP 格式
$args – 可选 – 您可以在此处传递一组参数来更改行为和标头，例如 cookie、跟随重定向等。
返回一个响应对象

<?php
$args = array(
    'body'        => $body,
    'timeout'     => '5',
    'headers'=>[],
    'cookies'=>[],
    'sslverify' => false,
    'redirection' => '5',
    'httpversion' => '1.0',
    'blocking'    => true,
    'headers'     => array(),
    'cookies'     => array(),
);

$response = wp_remote_post( 'http://your-contact-form.com', $args );

wp.media({
  title: '选择或上传图片', // 窗口标题
  button: {
    text: '选择', // 选择按钮文字
  },
  editable:   true,
  allowLocalEdits: true,
  displaySettings: true,
  displayUserSettings: true
  multiple: false // 是否允许多选
});

// 获取被选数据
media.state().get('selection').toJSON()

$template=get_page_template_slug( get_queried_object_id() );
if (strpos($template,"template/page/posts.php") !== false) {  }

<?php

//获取访问的标签或分类对象
get_queried_object()->term_id;
//获取分类、标签的链接
get_term_link($tag->term_id); 

<?php
get_the_author_meta( 'display_name', $post->post_author )