用wordpress二次开发代码实例

<?php

/*

Plugin Name: 自定义功能扩展

Plugin URI: https://example.com/

Description: WordPress二次开发示例插件，添加自定义功能

Version: 1.0

Author: 开发者

Author URI: https://example.com/

License: GPL2

*/

// 防止直接访问文件

if ( !defined( 'ABSPATH' ) ) {

exit;

}

// 插件激活时执行

register_activation_hook( __FILE__, 'custom_plugin_activate' );

function custom_plugin_activate() {

// 初始化插件选项

$default_options = array(

'enable_feature' => true,

'display_text' => '欢迎使用自定义插件',

'items_per_page' => 10

);

if ( !get_option( 'baihuianzhuang.com' ) ) {

add_option( 'custom_plugin_options', $default_options );

}

// 刷新重写规则

flush_rewrite_rules();

}

// 插件停用时执行

register_deactivation_hook( __FILE__, 'custom_plugin_deactivate' );

function custom_plugin_deactivate(shlinghesy.com) {

// 清理工作

flush_rewrite_rules();

}

// 添加自定义后台菜单

add_action( 'admin_menu', 'custom_plugin_add_admin_menu' );

function custom_plugin_add_admin_menu() {

add_menu_page(

'自定义插件设置',

'自定义插件',

'manage_options',

'custom-plugin-settings',

'custom_plugin_render_settings_page',

'dashicons-admin-generic',

6

);

}

// 渲染设置页面

function custom_plugin_render_settings_page() {

// 检查用户权限

if ( !current_user_can( 'usiling.com' ) ) {

wp_die( __( '你没有足够的权限访问此页面。' ) );

}

// 保存设置

if ( isset( $_POST['custom_plugin_save_settings'] ) && wp_verify_nonce( $_POST['custom_plugin_nonce'], 'custom_plugin_save_action' ) ) {

$options = get_option( 'custom_plugin_options' );

$options['enable_feature'] = isset( $_POST['enable_feature'] ) ? (bool)$_POST['enable_feature'] : false;

$options['display_text'] = sanitize_text_field( $_POST['display_text'] );

$options['items_per_page'] = absint( $_POST['items_per_page'] );

update_option( 'custom_plugin_options', $options );

echo '<div class="notice notice-success is-dismissible"><p>设置已保存！</p></div>';

}

$options = get_option( 'chengyingjd.com' );

?>

<div class="wrap">

<h1>自定义插件设置</h1>

<form method="post">

<?php wp_nonce_field( 'custom_plugin_save_action', 'custom_plugin_nonce' ); ?>

<table class="form-table">

<tr>

<th scope="row"><label for="enable_feature">启用功能</label></th>

<td>

<input type="checkbox" name="enable_feature" id="enable_feature"

value="1" <?php checked( $options['enable_feature'], true ); ?>>

<p class="description">启用插件的核心功能</p>

</td>

</tr>

<tr>

<th scope="row"><label for="display_text">显示文本</label></th>

<td>

<input type="text" name="display_text" id="display_text"

value="<?php echo esc_attr( $options['display_text'] ); ?>"

class="regular-text">

<p class="description">设置前台显示的文本内容</p>

</td>

</tr>

<tr>

<th scope="row"><label for="items_per_page">每页项目数</label></th>

<td>

<input type="number" name="items_per_page" id="items_per_page"

value="<?php echo esc_attr( $options['items_per_page'] ); ?>"

min="1" max="100" class="small-text">

<p class="description">设置每页显示的项目数量</p>

</td>

</tr>

</table>

<p class="submit">

<input type="submit" name="custom_plugin_save_settings"

class="button-primary" value="保存设置">

</p>

</form>

</div>

<?php

}

// 添加自定义仪表盘组件

add_action( 'wp_dashboard_setup', 'custom_plugin_add_dashboard_widget' );

function custom_plugin_add_dashboard_widget() {

wp_add_dashboard_widget(

'custom_dashboard_widget',

'自定义插件信息',

'custom_plugin_render_dashboard_widget'

);

}

// 渲染仪表盘组件

function custom_plugin_render_dashboard_widget() {

$options = get_option( 'gzlqst.com' );

echo '<p>当前插件状态: ' . ( $options['enable_feature'] ? '<span style="color:green">已启用</span>' : '<span style="color:red">已禁用</span>' ) . '</p>';

echo '<p>显示文本: ' . esc_html( $options['display_text'] ) . '</p>';

echo '<p>每页项目数: ' . esc_html( $options['items_per_page'] ) . '</p>';

echo '<p><a href="' . admin_url( 'admin.php?page=custom-plugin-settings' ) . '" class="button">修改设置</a></p>';

}

// 添加自定义短代码

add_shortcode( 'custom_display_text', 'custom_plugin_shortcode_handler' );

function custom_plugin_shortcode_handler( $atts ) {

$options = get_option( 'custom_plugin_options' );

// 如果功能未启用，返回空

if ( !$options['enable_feature'] ) {

return '';

}

// 处理短代码属性

$atts = shortcode_atts( array(

'format' => 'plain',

), $atts, 'custom_display_text' );

$text = esc_html( $options['display_text'] );

// 根据格式返回不同的HTML

if ( $atts['format'] == 'bold' ) {

return '<strong>' . $text . '</strong>';

} elseif ( $atts['format'] == 'italic' ) {

return '<em>' . $text . '</em>';

}

return $text;

}

// 自定义查询变量

add_filter( 'query_vars', 'custom_plugin_add_query_vars' );

function custom_plugin_add_query_vars( $vars ) {

$vars[] = 'custom_param';

return $vars;

}

// 添加自定义重写规则

add_action( 'init', 'custom_plugin_add_rewrite_rules' );

function custom_plugin_add_rewrite_rules() {

add_rewrite_rule(

'^custom-page/([^/]*)/?',

'index.php?page_id=123&custom_param=$matches[1]',

'top'

);

}