如何开发一个自动生成SEO优化相关内容的WordPress插件

<?php
/**
 * Plugin Name: SEO Optimization Plugin
 * Plugin URI: [插件网址]
 * Description: 一个自动生成SEO优化相关内容的WordPress插件
 * Version: 1.0
 * Author: [作者名字]
 * Author URI: [作者网址]
 * License: GPL2
 */

// 插件的代码从这里开始
?>

// 添加设置页面
function seo_optimization_plugin_settings_page() {
    add_menu_page( 'SEO Optimization Plugin', 'SEO Optimization', 'manage_options', 'seo-optimization-plugin', 'seo_optimization_plugin_settings_page_content' );
}
add_action( 'admin_menu', 'seo_optimization_plugin_settings_page' );

// 设置页面的内容
function seo_optimization_plugin_settings_page_content() {
    ?>
    <div class="wrap">
        <h2>SEO Optimization Plugin</h2>
        <form method="post" action="options.php">
            <?php settings_fields( 'seo_optimization_plugin_settings' ); ?>
            <?php do_settings_sections( 'seo_optimization_plugin_settings' ); ?>
            <?php submit_button(); ?>
        </form>
    </div>
    <?php
}

// 添加SEO优化内容
function seo_optimization_plugin_meta_box() {
    add_meta_box( 'seo-optimization-plugin-meta-box', 'SEO Optimization', 'seo_optimization_plugin_meta_box_content', 'post' );
}
add_action( 'add_meta_boxes', 'seo_optimization_plugin_meta_box' );

// SEO优化内容的内容
function seo_optimization_plugin_meta_box_content() {
    global $post;
    $seo_optimization_content = get_post_meta( $post->ID, 'seo_optimization_content', true );
    ?>
    <div>
        <label for="seo-optimization-content">SEO优化内容：</label>
        <textarea id="seo-optimization-content" name="seo-optimization-content" rows="5" cols="50"><?php echo esc_attr( $seo_optimization_content ); ?></textarea>
    </div>
    <?php
}

// 保存SEO优化内容
function seo_optimization_plugin_save_meta_box( $post_id ) {
    if ( isset( $_POST['seo-optimization-content'] ) ) {
        update_post_meta( $post_id, 'seo_optimization_content', sanitize_text_field( $_POST['seo-optimization-content'] ) );
    }
}
add_action( 'save_post', 'seo_optimization_plugin_save_meta_box' );

// 自动生成SEO优化内容
function seo_optimization_plugin_generate_content( $content ) {
    global $post;
    $seo_optimization_content = get_post_meta( $post->ID, 'seo_optimization_content', true );
    if ( ! empty( $seo_optimization_content ) ) {
        $content .= '<div class="seo-optimization">' . $seo_optimization_content . '</div>';
    }
    return $content;
}
add_filter( 'the_content', 'seo_optimization_plugin_generate_content' );

// 添加选项设置
function seo_optimization_plugin_settings() {
    register_setting( 'seo_optimization_plugin_settings', 'seo_optimization_plugin_settings', 'seo_optimization_plugin_settings_validate' );

    add_settings_section( 'seo_optimization_plugin_general', '常规设置', 'seo_optimization_plugin_general_section_callback', 'seo_optimization_plugin_settings' );

    add_settings_field( 'number_of_words', '生成的内容字数', 'seo_optimization_plugin_number_of_words_callback', 'seo_optimization_plugin_settings', 'seo_optimization_plugin_general' );
}
add_action( 'admin_init', 'seo_optimization_plugin_settings' );

// 常规设置的回调函数
function seo_optimization_plugin_general_section_callback() {
    echo '<p>常规设置</p>';
}

// 字数选项的回调函数
function seo_optimization_plugin_number_of_words_callback() {
    $options = get_option( 'seo_optimization_plugin_settings' );
    echo '<input type="number" name="seo_optimization_plugin_settings[number_of_words]" value="' . esc_attr( $options['number_of_words'] ) . '" />';
}

// 选项设置的验证函数
function seo_optimization_plugin_settings_validate( $input ) {
    $output = array();
    $output['number_of_words'] = intval( $input['number_of_words'] );
    return $output;
}