有一天，我想知道如何让 wordpress 插件选项由 json 文件控制，以便将来可以更轻松地添加其他设置，而无需调整代码本身。
本文提供了一个极其简单的 wordpress 插件示例，该插件的单个设置页面由 2 个部分和 3 个字段/选项组成。
完整代码可以在github上找到。
设置基地
该插件最初由 3 个文件组成。
- adventures.json
- adventures.php
- class.adventures.php
adventures.php 带有基本插件注册：
<?php
/*
plugin name: adventures
plugin uri: https://mortenhartvig.dk
description: lorem ipsum dolor sit amet, consectetur adipiscing elit. sed pharetra nisi eu varius pellentesque. aenean posuere, velit mollis sodales convallis, ipsum lectus feugiat nunc, ac auctor sapien enim eu metus.
version: 1
requires at least: 6.1
requires php: 8.3
author: morten hartvig
author uri: https://mortenhartvig.dk
license: do whatever you want
*/
define('adv__plugin_dir', plugin_dir_path(__file__));
define('adv__plugin_view', adv__plugin_dir . 'views');
define('adv__plugin_slug', 'adv');
require_once adv__plugin_dir . 'class.adventures.php';
(new adventures());
class.adventures.php 带有一个空类：
<?php
class adventures {
public function __construct() {
}
}
adventures.json 包含插件设置的 json 结构：
{
"settings": {
"pages": [
{
"title": "adventures",
"capability": "manage_options",
"slug": "adv"
}
],
"sections": [
{
"id": "portal_base",
"title": "base configuration",
"description": "lorem 1, ipsum dolor sit amet consectetur adipisicing elit. cumque nulla in officiis. laborum quisquam illo eaque, deserunt facere mollitia sint doloremque maiores, obcaecati reiciendis voluptate itaque iure fugiat quia architecto!",
"view": "section"
},
{
"id": "portal_appearance",
"title": "appearance",
"description": "lorem 2, ipsum dolor sit amet consectetur adipisicing elit. cumque nulla in officiis. laborum quisquam illo eaque, deserunt facere mollitia sint doloremque maiores, obcaecati reiciendis voluptate itaque iure fugiat quia architecto!",
"view": "section"
}
],
"fields": [
{
"id": "adv_portal_key",
"title": "portal key",
"section": "portal_base",
"type": "text",
"placeholder": "enter your portal key",
"view": "field.text"
},
{
"id": "adv_api_host",
"title": "host api",
"section": "portal_base",
"type": "text",
"placeholder": "enter api host",
"default": "https://api.mortenhartvig.dk",
"view": "field.text"
},
{
"id": "adv_portal_theme",
"title": "theme",
"section": "portal_appearance",
"type": "select",
"options": {
"rounded.v1": "round (v1)",
"squared.v1": "square (v1)",
"standard": "standard"
},
"default": "standard",
"view": "field.select"
}
]
}
}
读取 json 数据
为您的设置创建一个属性并调用 set_settings():
private $settings;
public function __construct() {
$this->set_settings();
}
创建 set_settings() 和 get_json_data():
private function set_settings() {
$data = $this->get_json_data();
$this->settings = $data['settings'];
}
private function get_json_data() {
$file = adv__plugin_dir . 'adventures.json';
if (!file_exists($file)) {
die('adventures.json not found');
}
return json_decode(file_get_contents($file), true);
}
如果您将 die(print_r($this->settings)) 添加到您的 __construct 中，您可以确认您确实已加载设置。
设置页面
从构造函数中调用 init_hooks():
public function __construct() {
$this->set_settings();
$this->init_hooks();
}
创建init_hooks():
private function init_hooks() {
add_action('admin_menu', [$this, 'register_settings_pages']);
}
创建register_settings_pages()和settings_page_callback()。
public function register_settings_pages() {
foreach ($this->settings['pages'] as $page) {
add_options_page($page['title'], $page['title'], $page['capability'], $page['slug'], [$this, 'settings_page_callback']);
}
}
public function settings_page_callback() {
$this->render('settings.php');
}
创建渲染():
private function render($filename, $args) {
if (is_array($args)) {
$value = get_option($args['id']);
if (empty($value) && isset($args['default'])) {
$value = $args['default'];
}
$args = array_merge($args, ['value' => $value]);
}
$file = adv__plugin_view . $filename;
if (!str_ends_with($file,'.php')) {
$file .= '.php';
}
if(!file_exists($file)) {
die('file not found ' . $filename);
}
require $file;
}
创建views/settings.php：
<div class="wrap">
<h1>adventures</h1>
</div>
部分
在 init_hooks 中添加另一个操作：
private function init_hooks() {
add_action('admin_menu', [$this, 'register_settings_pages']);
add_action('admin_init', [$this, 'register_settings_sections']);
}
创建register_settings_sections()和settings_section_callback():
public function register_settings_sections() {
foreach ($this->settings['sections'] as $section) {
add_settings_section($section['id'], $section['title'], [$this, 'settings_section_callback'], adv__plugin_slug, $section);
}
}
public function settings_section_callback($args) {
$this->render($args['view'], $args);
}
创建views/section.php：
<p>
<?php echo $args['description']; ?>
</p>
领域
在 init_hooks 中添加第三个操作：
private function init_hooks() {
add_action('admin_menu', [$this, 'register_settings_pages']);
add_action('admin_init', [$this, 'register_settings_sections']);
add_action('admin_init', [$this, 'register_settings_fields']);
}
创建register_settings_fields()和settings_field_callback():
public function register_settings_fields() {
foreach ($this->settings['fields'] as $field) {
add_settings_field($field['id'], $field['title'], [$this, 'settings_field_callback'], adv__plugin_slug, $field['section'], $field);
register_setting(adv__plugin_slug, $field['id']);
}
}
public function settings_field_callback($args) {
$this->render($args['view'], $args);
}
创建views/field.select.php：
<?php
$html_options = '';
foreach ($args['options'] as $key => $val) {
$html_options .= sprintf('<option value="%s" %s >%s</option>', $key, selected($args['value'], $key, false), $val);
}
printf('<select name="%s" id="%s">%s</select>', $args['id'], $args['id'], $html_options);
创建views/field.text.php：
<?php
printf('<input name="%s" id="%s" type="text" value="%s" placeholder="%s" />',
$args['id'], $args['id'], $args['value'], $args['placeholder']);
保存
要查看并保存您的选项，请在 settings.php 中添加一个表单：
<div class="wrap">
<h1>adventures</h1>
<form action="options.php" method="post">
<?php
settings_fields(adv__plugin_slug);
do_settings_sections(adv__plugin_slug);
submit_button();
?>
</form>
</div>
更改选项并尝试保存。保存应该成功。
您的设置现已保存，可以通过以下方式在整个网站上访问：
<?php
echo get_option('adv_portal_theme'); // squared.v1
添加新字段
将以下 json 添加到 adventures.json：
{
"id": "adv_api_token",
"title": "Host API Token",
"section": "portal_base",
"type": "text",
"placeholder": "Enter API host token",
"default": "",
"view": "field.text"
}
它将自动添加到您的设置中：
