如何开发一个简单的WordPress 插件

复制my-plugin/
├── my-plugin.php
├── css/
│   └── style.css
├── js/
│   └── script.js
└── README.md

<?php
/**
 * Plugin Name: My First Plugin
 * Plugin URI: https://example.com/my-first-plugin
 * Description: 这是我第一个 WordPress 插件。
 * Version: 1.0
 * Author: Your Name
 * Author URI: https://example.com
 * License: GPL2
 */

php复制function my_first_plugin_footer_text() {
    echo '<p>这是我第一个插件添加的文本。</p>';
}
add_action('wp_footer', 'my_first_plugin_footer_text');

function my_first_plugin_send_email($post_id) {
    $post = get_post($post_id);
    $to = 'you@example.com';
    $subject = '新文章发布：' . $post->post_title;
    $message = '文章内容：' . $post->post_content;
    wp_mail($to, $subject, $message);
}
add_action('publish_post', 'my_first_plugin_send_email');

function my_first_plugin_modify_content($content) {
    return $content . '<p>感谢阅读！</p>';
}
add_filter('the_content', 'my_first_plugin_modify_content');

function my_first_plugin_shortcode() {
    return '<p>这是一个自定义短代码的内容。</p>';
}
add_shortcode('my_shortcode', 'my_first_plugin_shortcode');

function my_first_plugin_menu() {
    add_options_page('我的插件设置', '我的插件', 'manage_options', 'my-first-plugin', 'my_first_plugin_settings_page');
}
add_action('admin_menu', 'my_first_plugin_menu');

function my_first_plugin_settings_page() {
    ?>
    <div class="wrap">
        <h1>我的插件设置</h1>
        <form method="post" action="options.php">
            <?php
            settings_fields('my_first_plugin_options_group');
            do_settings_sections('my_first_plugin');
            submit_button();
            ?>
        </form>
    </div>
    <?php
}

function my_first_plugin_settings_init() {
    register_setting('my_first_plugin_options_group', 'my_first_plugin_option');
    add_settings_section('my_first_plugin_section', '设置部分', null, 'my_first_plugin');
    add_settings_field('my_first_plugin_option', '选项', 'my_first_plugin_option_callback', 'my_first_plugin', 'my_first_plugin_section');
}
add_action('admin_init', 'my_first_plugin_settings_init');

function my_first_plugin_option_callback() {
    $option = get_option('my_first_plugin_option');
    echo '<input type="text" name="my_first_plugin_option" value="' . esc_attr($option) . '" />';
}

global $wpdb;
$table_name = $wpdb->prefix . 'my_custom_table';
$wpdb->insert($table_name, array(
    'column1' => 'value1',
    'column2' => 'value2',
));

$results = $wpdb->get_results("SELECT * FROM $table_name WHERE column1 = 'value1'");
foreach ($results as $row) {
    echo $row->column2;
}

$wpdb->update($table_name, array('column1' => 'new_value'), array('column2' => 'value2'));

$wpdb->delete($table_name, array('column1' => 'value1'));

function my_first_plugin_load_textdomain() {
    load_plugin_textdomain('my-first-plugin', false, dirname(plugin_basename(__FILE__)) . '/languages/');
}
add_action('plugins_loaded', 'my_first_plugin_load_textdomain');

echo __('这是一个翻译的文本', 'my-first-plugin');
_e('这是一个翻译的文本', 'my-first-plugin');