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Maximize the use of the Code Snippets plugin by sharing some useful code snippets that can be readily used

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Useful code snippets: This is a straightforward tutorial article about WordPress. I will be sharing with you the usage of the Code Snippets plugin, as well as a few highly practical code snippets that you can readily use. You simply need to add them to the Code Snippets plugin and run it.

【WP-Host/悦然wordpress建站】

How to use the Code Snippets plugin

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The use of the Code Snippets plugin is very simple. After installation and activation, click “Add New”, then fill in the title of the code snippet, fill in the code in the middle “Code”, and then click “Save Changes and Activate” to save and activate.

Code Snippets

https://wordpress.org/plugins/code-snippets/

Code Snippets sharing

Next, I will share a few code snippets that I often use. If necessary, you can directly copy and add the following code to the Code Snippets plugin.

Code 1: wordpress switches back to classic widgets

This code turns your wordpress block widget into a classic widget.

// This code turns your wordpress block widget into a classic widget.
add_filter( 'gutenberg_use_widgets_block_editor', '__return_false' );
add_filter( 'use_widgets_block_editor', '__return_false' );

This code can redirect the author’s link, and the link can be modified arbitrarily.

//This code can redirect the author's link, and the link can be modified arbitrarily.
add_filter( 'author_link', 'fanly_author_link' );
function fanly_author_link() {
  return home_url( '/' );//This means redirect to the home page, you can also fill other pages
}

Code 3: Automatically add alt and title attributes to the article image

This code can automatically add ALT and TITLE attributes to the picture of the article, which can help you do a good job in picture SEO, and is good for the SEO optimization of the whole site.

//Automatically add alt and title attributes to the article image
function image_alt_tag($content){
global $post;preg_match_all('/<img (.*?)\/>/', $content, $images);
if(!is_null($images)) {foreach($images[1] as $index => $value)
{$new_img = str_replace('<img', '<img alt="'.get_the_title().'-'.get_bloginfo('name').'" title="'.get_the_title().'-'.get_bloginfo('name').'"', $images[0][$index]);
$content = str_replace($images[0][$index], $new_img, $content);}}
return $content;
}
add_filter('the_content', 'image_alt_tag', 99999);

Code 4: Admin quick switch

After this code is added, you can quickly switch between multiple administrators, without logging out and logging in again, and without re-entering the password.

//Admin quick switch
add_filter('user_row_actions', function($actions, $user){
    $capability = (is_multisite())?'manage_site':'manage_options';
    if(current_user_can($capability)){
        $actions['login_as']    = '<a title="log in as" href="'.wp_nonce_url("users.php?action=login_as&users=$user->ID", 'bulk-users').'">log in as</a>';
    }
    return $actions;
}, 10, 2);

add_filter('handle_bulk_actions-users', function($sendback, $action, $user_ids){
    if($action == 'login_as'){
        wp_set_auth_cookie($user_ids, true);
        wp_set_current_user($user_ids);
    }
    return admin_url();
},10,3);

Code 5: Add article copying function

This code can add a quick copy function to the article, and the same article can be published, and then you only need to modify it on this basis.

//Function creates post duplicate as a draft and redirects then to the edit post 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'] = '<a href="' . wp_nonce_url('admin.php?action=rd_duplicate_post_as_draft&post=' . $post->ID, basename(__FILE__), 'duplicate_nonce' ) . '" title="Duplicate this item" rel="permalink">Duplicate</a>';
    }
    return $actions;
}
add_filter( 'post_row_actions', 'rd_duplicate_post_link', 10, 2 );

Code 6: Hide the category classification mark

The use of this code is to hide the category mark in the URL, which can shorten the link, which is a little bit good for SEO.

//Hide the category classification mark
add_action( 'load-themes.php',  'no_category_base_refresh_rules');
add_action('created_category', 'no_category_base_refresh_rules');
add_action('edited_category', 'no_category_base_refresh_rules');
add_action('delete_category', 'no_category_base_refresh_rules');
function no_category_base_refresh_rules() {
    global $wp_rewrite;
    $wp_rewrite -> flush_rules();
}
// register_deactivation_hook(__FILE__, 'no_category_base_deactivate');
// function no_category_base_deactivate() {
//  remove_filter('category_rewrite_rules', 'no_category_base_rewrite_rules');
//  // We don't want to insert our custom rules again
//  no_category_base_refresh_rules();
// }
// Remove category base
add_action('init', 'no_category_base_permastruct');
function no_category_base_permastruct() {
    global $wp_rewrite, $wp_version;
    if (version_compare($wp_version, '3.4', '<')) {
        // For pre-3.4 support
        $wp_rewrite -> extra_permastructs['category'][0] = '%category%';
    } else {
        $wp_rewrite -> extra_permastructs['category']['struct'] = '%category%';
    }
}
// Add our custom category rewrite rules
add_filter('category_rewrite_rules', 'no_category_base_rewrite_rules');
function no_category_base_rewrite_rules($category_rewrite) {
    //var_dump($category_rewrite); // For Debugging
    $category_rewrite = array();
    $categories = get_categories(array('hide_empty' => false));
    foreach ($categories as $category) {
        $category_nicename = $category -> slug;
        if ($category -> parent == $category -> cat_ID)// recursive recursion
            $category -> parent = 0;
        elseif ($category -> parent != 0)
            $category_nicename = get_category_parents($category -> parent, false, '/', true) . $category_nicename;
        $category_rewrite['(' . $category_nicename . ')/(?:feed/)?(feed|rdf|rss|rss2|atom)/?$'] = 'index.php?category_name=$matches[1]&feed=$matches[2]';
        $category_rewrite['(' . $category_nicename . ')/page/?([0-9]{1,})/?$'] = 'index.php?category_name=$matches[1]&paged=$matches[2]';
        $category_rewrite['(' . $category_nicename . ')/?$'] = 'index.php?category_name=$matches[1]';
    }
    // Redirect support from Old Category Base
    global $wp_rewrite;
    $old_category_base = get_option('category_base') ? get_option('category_base') : 'category';
    $old_category_base = trim($old_category_base, '/');
    $category_rewrite[$old_category_base . '/(.*)$'] = 'index.php?category_redirect=$matches[1]';
    //var_dump($category_rewrite); // For Debugging
    return $category_rewrite;
}
// Add 'category_redirect' query variable
add_filter('query_vars', 'no_category_base_query_vars');
function no_category_base_query_vars($public_query_vars) {
    $public_query_vars[] = 'category_redirect';
    return $public_query_vars;
}
// Redirect if 'category_redirect' is set
add_filter('request', 'no_category_base_request');
function no_category_base_request($query_vars) {
    //print_r($query_vars); // For Debugging
    if (isset($query_vars['category_redirect'])) {
        $catlink = trailingslashit(get_option('home')) . user_trailingslashit($query_vars['category_redirect'], 'category');
        status_header(301);
        header("Location: $catlink");
        exit();
    }
    return $query_vars;
}

Code Snippets插件使用方法

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Code Snippets插件的使用非常简单,安装激活之后,点“Add New”,然后填写代码片断的标题,中间“Code”填写代码,然后点“Save Changes and Activate”保存激活即可。

Code Snippets

https://wordpress.org/plugins/code-snippets/

Code Snippets代码片断分享

接下来我把我自己常用的几个代码片断分享出来,如果需要,你可以直接把下面的代码复制添加到Code Snippets插件中即可。

代码1:wordpress切换回经典小工具

这个代码可以让你的wordpress区块小工具变为经典小工具。

// wordpress切换回经典小工具
add_filter( 'gutenberg_use_widgets_block_editor', '__return_false' );
add_filter( 'use_widgets_block_editor', '__return_false' );

代码2:重定向作者链接

这个代码可以重定向作者链接,链接可以任意修改。

//重定向作者链接
add_filter( 'author_link', 'fanly_author_link' );
function fanly_author_link() {
  return home_url( '/' );//这表示重定向到首页,可以以填写其它页面
}

代码3:文章图片自动添加alt和title属性

这个代码可以自动为文章图片添加ALT和TITLE属性,可以帮助你做好图片SEO,对整站SEO优化有好处。

//文章图片自动添加alt和title属性
function image_alt_tag($content){
global $post;preg_match_all('/<img (.*?)\/>/', $content, $images);
if(!is_null($images)) {foreach($images[1] as $index => $value)
{$new_img = str_replace('<img', '<img alt="'.get_the_title().'-'.get_bloginfo('name').'" title="'.get_the_title().'-'.get_bloginfo('name').'"', $images[0][$index]);
$content = str_replace($images[0][$index], $new_img, $content);}}
return $content;
}
add_filter('the_content', 'image_alt_tag', 99999);

代码4:管理员快速切换

这个代码添加后可以在多个管理员之间快速切换,不需要退出再登陆,也不需要重新输入密码。

//管理员快速切换
add_filter('user_row_actions', function($actions, $user){
    $capability = (is_multisite())?'manage_site':'manage_options';
    if(current_user_can($capability)){
        $actions['login_as']    = '<a title="以此身份登陆" href="'.wp_nonce_url("users.php?action=login_as&users=$user->ID", 'bulk-users').'">以此身份登陆</a>';
    }
    return $actions;
}, 10, 2);

add_filter('handle_bulk_actions-users', function($sendback, $action, $user_ids){
    if($action == 'login_as'){
        wp_set_auth_cookie($user_ids, true);
        wp_set_current_user($user_ids);
    }
    return admin_url();
},10,3);

代码5:添加文章复制功能

这个代码可以给文章添加一个快速复制功能,可以一篇相同的文章出来,然后你只需要在这个基础上修改就可以了。

//Function creates post duplicate as a draft and redirects then to the edit post 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'] = '<a href="' . wp_nonce_url('admin.php?action=rd_duplicate_post_as_draft&post=' . $post->ID, basename(__FILE__), 'duplicate_nonce' ) . '" title="Duplicate this item" rel="permalink">Duplicate</a>';
    }
    return $actions;
}
add_filter( 'post_row_actions', 'rd_duplicate_post_link', 10, 2 );

代码6:隐藏category分类标志

这个代码的使用是隐藏URL中的category分类标志,可以缩短链接,对SEO有一点好处。

//去除分类标志代码
add_action( 'load-themes.php',  'no_category_base_refresh_rules');
add_action('created_category', 'no_category_base_refresh_rules');
add_action('edited_category', 'no_category_base_refresh_rules');
add_action('delete_category', 'no_category_base_refresh_rules');
function no_category_base_refresh_rules() {
    global $wp_rewrite;
    $wp_rewrite -> flush_rules();
}
// register_deactivation_hook(__FILE__, 'no_category_base_deactivate');
// function no_category_base_deactivate() {
//  remove_filter('category_rewrite_rules', 'no_category_base_rewrite_rules');
//  // We don't want to insert our custom rules again
//  no_category_base_refresh_rules();
// }
// Remove category base
add_action('init', 'no_category_base_permastruct');
function no_category_base_permastruct() {
    global $wp_rewrite, $wp_version;
    if (version_compare($wp_version, '3.4', '<')) {
        // For pre-3.4 support
        $wp_rewrite -> extra_permastructs['category'][0] = '%category%';
    } else {
        $wp_rewrite -> extra_permastructs['category']['struct'] = '%category%';
    }
}
// Add our custom category rewrite rules
add_filter('category_rewrite_rules', 'no_category_base_rewrite_rules');
function no_category_base_rewrite_rules($category_rewrite) {
    //var_dump($category_rewrite); // For Debugging
    $category_rewrite = array();
    $categories = get_categories(array('hide_empty' => false));
    foreach ($categories as $category) {
        $category_nicename = $category -> slug;
        if ($category -> parent == $category -> cat_ID)// recursive recursion
            $category -> parent = 0;
        elseif ($category -> parent != 0)
            $category_nicename = get_category_parents($category -> parent, false, '/', true) . $category_nicename;
        $category_rewrite['(' . $category_nicename . ')/(?:feed/)?(feed|rdf|rss|rss2|atom)/?$'] = 'index.php?category_name=$matches[1]&feed=$matches[2]';
        $category_rewrite['(' . $category_nicename . ')/page/?([0-9]{1,})/?$'] = 'index.php?category_name=$matches[1]&paged=$matches[2]';
        $category_rewrite['(' . $category_nicename . ')/?$'] = 'index.php?category_name=$matches[1]';
    }
    // Redirect support from Old Category Base
    global $wp_rewrite;
    $old_category_base = get_option('category_base') ? get_option('category_base') : 'category';
    $old_category_base = trim($old_category_base, '/');
    $category_rewrite[$old_category_base . '/(.*)$'] = 'index.php?category_redirect=$matches[1]';
    //var_dump($category_rewrite); // For Debugging
    return $category_rewrite;
}
// Add 'category_redirect' query variable
add_filter('query_vars', 'no_category_base_query_vars');
function no_category_base_query_vars($public_query_vars) {
    $public_query_vars[] = 'category_redirect';
    return $public_query_vars;
}
// Redirect if 'category_redirect' is set
add_filter('request', 'no_category_base_request');
function no_category_base_request($query_vars) {
    //print_r($query_vars); // For Debugging
    if (isset($query_vars['category_redirect'])) {
        $catlink = trailingslashit(get_option('home')) . user_trailingslashit($query_vars['category_redirect'], 'category');
        status_header(301);
        header("Location: $catlink");
        exit();
    }
    return $query_vars;
}

WordPress Hosting / 悦然wordpress建站

WordPress Hosting / 悦然wordpress建站

【WordPress Hosting / 悦然wordpress建站】I am a WordPress hobby from China, and I like to communicate with friends from all over the world to learn WordPress website building and maintenance related knowledge.