运用代码段(Code Snippets)插件管理代码，可以不用额外安装更多插件，来解决WordPress建站过程中的一些常见功能需求，譬如安装Google analytics跟踪代码。下文中记录了我在搭建外贸网站和个人博客中常用到的代码段。
如何在WordPress文章/页面上禁止加载WooCommerce .Js(Javascript)和.Css文件？
woocommerce会在每个页面都默认加载几个css和js，这对网站速度是有影响的，将下面这段代码，在code snippets插件中添加一个新snippet，能够实现在除了购物车、结算、账户、产品以外的页面中，移除woocommerce的css和js。
/** Disable All WooCommerce Styles and Scripts Except Shop Pages*/add_action( 'wp_enqueue_scripts', 'dequeue_woocommerce_styles_scripts', 99 );function dequeue_woocommerce_styles_scripts() {if ( function_exists( 'is_woocommerce' ) ) {if ( ! is_woocommerce() && ! is_cart() && ! is_checkout() ) {# Styleswp_dequeue_style( 'woocommerce-general' );wp_dequeue_style( 'woocommerce-layout' );wp_dequeue_style( 'woocommerce-smallscreen' );wp_dequeue_style( 'woocommerce_frontend_styles' );wp_dequeue_style( 'woocommerce_fancybox_styles' );wp_dequeue_style( 'woocommerce_chosen_styles' );wp_dequeue_style( 'woocommerce_prettyPhoto_css' );# Scriptswp_dequeue_script( 'wc_price_slider' );wp_dequeue_script( 'wc-single-product' );wp_dequeue_script( 'wc-add-to-cart' );wp_dequeue_script( 'wc-cart-fragments' );wp_dequeue_script( 'wc-checkout' );wp_dequeue_script( 'wc-add-to-cart-variation' );wp_dequeue_script( 'wc-single-product' );wp_dequeue_script( 'wc-cart' );wp_dequeue_script( 'wc-chosen' );wp_dequeue_script( 'woocommerce' );wp_dequeue_script( 'prettyPhoto' );wp_dequeue_script( 'prettyPhoto-init' );wp_dequeue_script( 'jquery-blockui' );wp_dequeue_script( 'jquery-placeholder' );wp_dequeue_script( 'fancybox' );wp_dequeue_script( 'jqueryui' );}}}如何禁用WordPress的XML-RPC
WordPress站点很少需要启用XML-RPC，但是启用它可能会导致大量的安全问题。如果你使用WordPress应用程序，你才需要启用它。此代码片段将禁用XML-RPC以提高站点安全性。
add_filter('xmlrpc_enabled', '__return_false');如何用代码段安装Google Analytics跟踪代码
请将从Google analytics中获取的跟踪代码放入到如下代码段中
add_action( 'wp_head', function () { ?>这里粘贴Google Analytics的跟踪代码<?php });相关教程：如何给WordPress网站安装Google Analytics跟踪代码
如何移除/隐藏WordPress评论中的Url字段
下面这段代码可以移除/隐藏部分WordPress主题中评论URL字段，如果你使用后发现不能移除，那说明主题不兼容，你可以在谷歌搜索：Remove Website field from the Comment Form in XXX theme，将XXX改为你的主题名称。
function remove_comment_fields($fields) {unset($fields['url']);return $fields;}add_filter('comment_form_default_fields','remove_comment_fields');譬如，在astra主题免费版中，隐藏评论的url字段使用下面的代码
function wpd_remove_comment_website_field( $fields ) { unset( $fields['url'] ); return $fields;}add_filter( 'comment_form_default_fields', 'wpd_remove_comment_website_field', 99 );在astra 主题付费版中，移除评论的url字段使用下面的代码
function wpd_remove_comment_website_field( $fields ) { unset( $fields['url'] ); return $fields;}add_filter( 'astra_comment_form_default_fields_markup', 'wpd_remove_comment_website_field', 99 );如何用代码段实现复制文章功能
下面这段代码可以给WordPress文章/自定义文章添加复制功能，在文章列表中会出现duplicate按钮，但不会给页面添加复制功能。使用它你可以省了一个复制文章功能插件。
/* * Function for post duplication. Dups appear as drafts. User is redirected to the edit screen */function rd_duplicate_post_as_draft(){ global $wpdb; if (! ( isset( $_GET['post']) || isset( $_POST['post']) || ( isset($_REQUEST['action']) && 'rd_duplicate_post_as_draft' == $_REQUEST['action'] ) ) ) { wp_die('No post to duplicate has been supplied!'); } /* * Nonce verification */ if ( !isset( $_GET['duplicate_nonce'] ) || !wp_verify_nonce( $_GET['duplicate_nonce'], basename( __FILE__ ) ) ) return; /* * get the original post id */ $post_id = (isset($_GET['post']) ? absint( $_GET['post'] ) : absint( $_POST['post'] ) ); /* * and all the original post data then */ $post = get_post( $post_id ); /* * if you don't want current user to be the new post author, * then change next couple of lines to this: $new_post_author = $post->post_author; */ $current_user = wp_get_current_user(); $new_post_author = $current_user->ID; /* * if post data exists, create the post duplicate */ if (isset( $post ) && $post != null) { /* * new post data array */ $args = array( 'comment_status' => $post->comment_status, 'ping_status' => $post->ping_status, 'post_author' => $new_post_author, 'post_content' => $post->post_content, 'post_excerpt' => $post->post_excerpt, 'post_name' => $post->post_name, 'post_parent' => $post->post_parent, 'post_password' => $post->post_password, 'post_status' => 'draft', 'post_title' => $post->post_title, 'post_type' => $post->post_type, 'to_ping' => $post->to_ping, 'menu_order' => $post->menu_order ); /* * insert the post by wp_insert_post() function */ $new_post_id = wp_insert_post( $args ); /* * get all current post terms ad set them to the new post draft */ $taxonomies = get_object_taxonomies($post->post_type); // returns array of taxonomy names for post type, ex array("category", "post_tag"); foreach ($taxonomies as $taxonomy) { $post_terms = wp_get_object_terms($post_id, $taxonomy, array('fields' => 'slugs')); wp_set_object_terms($new_post_id, $post_terms, $taxonomy, false); } /* * duplicate all post meta just in two SQL queries */ $post_meta_infos = $wpdb->get_results("SELECT meta_key, meta_value FROM $wpdb->postmeta WHERE post_id=$post_id"); if (count($post_meta_infos)!=0) { $sql_query = "INSERT INTO $wpdb->postmeta (post_id, meta_key, meta_value) "; foreach ($post_meta_infos as $meta_info) { $meta_key = $meta_info->meta_key; if( $meta_key == '_wp_old_slug' ) continue; $meta_value = addslashes($meta_info->meta_value); $sql_query_sel[]= "SELECT $new_post_id, '$meta_key', '$meta_value'"; } $sql_query.= implode(" UNION ALL ", $sql_query_sel); $wpdb->query($sql_query); } /* * finally, redirect to the edit post screen for the new draft */ wp_redirect( admin_url( 'post.php?action=edit&post=' . $new_post_id ) ); exit; } else { wp_die('Post creation failed, could not find original post: ' . $post_id); }}add_action( 'admin_action_rd_duplicate_post_as_draft', 'rd_duplicate_post_as_draft' ); /* * Add the duplicate link to action list for post_row_actions */function rd_duplicate_post_link( $actions, $post ) { if (current_user_can('edit_posts')) { $actions['duplicate'] = 'ID, basename(__FILE__), 'duplicate_nonce' ) . '" rel="permalink">Duplicate'; } return $actions;} add_filter( 'post_row_actions', 'rd_duplicate_post_link', 10, 2 );如何用代码段禁止WordPress自动生成图片
由于每张图片在上传到WordPress时，会被WordPress或部分插件自动生成很多不同尺寸的图片，针对用不上的图片尺寸，可以用短代码直接组织系统生成图片，不仅能节省空间，也能避免消耗压缩额度，下面介绍如何用代码段(code snippets)禁止WordPress自动生成图片。
需要知道的是，这些自动生成的图片并不能在Wordpress的媒体库看到，需要在服务器的文件夹中查看。
下图是Siteground后台查看图片文件的方法，请在进入网站的Sitetools后按下图所示顺序操作查看，我们能看到系统为同一张图生成了很多不同尺寸的图片。
在网站页面设计完、内容上传前，我们先禁止所有自动生成的图片；若马上可以上传内容了，我们可以根据设计情况，酌情放开部分图片尺寸，譬如在制作产品列表页时，我们用到了300*300px的图片，那么就在下面的代码中，将对应行的代码前加//注释掉或直接删除该行。
// disable generated image sizesfunction shapeSpace_disable_image_sizes($sizes) { unset($sizes['thumbnail']); // disable thumbnail size unset($sizes['medium']); // disable medium size unset($sizes['large']); // disable large size unset($sizes['medium_large']); // disable medium-large size unset($sizes['1536x1536']); // disable 2x medium-large size unset($sizes['2048x2048']); // disable 2x large size unset($sizes['shop_catalog']); unset($sizes['shop_single']); unset($sizes['shop_thumbnail']); unset($sizes['woocommerce_thumbnail']); unset($sizes['woocommerce_single']); unset($sizes['woocommerce_gallery_thumbnail']); return $sizes;}add_action('intermediate_image_sizes_advanced', 'shapeSpace_disable_image_sizes');// disable scaled image sizeadd_filter('big_image_size_threshold', '__return_false');// disable other image sizesfunction shapeSpace_disable_other_image_sizes() { remove_image_size('post-thumbnail'); // disable images added via set_post_thumbnail_size() remove_image_size('another-size'); // disable any other added image sizes}add_action('init', 'shapeSpace_disable_other_image_sizes');如何用代码段去掉Woocommerce产品首页、列表页的面包屑
/** * Remove the breadcrumbs */add_action( 'init', 'woo_remove_wc_breadcrumbs' );function woo_remove_wc_breadcrumbs() { remove_action( 'woocommerce_before_main_content', 'woocommerce_breadcrumb', 20, 0 );}本文章为转载内容，我们尊重原作者对文章享有的著作权。如有内容错误或侵权问题，欢迎原作者联系我们进行内容更正或删除文章。
