我已经阅读了许多相关的问题，并尽我所能确保它实际上是重复的，然后再标记。
我已经使用WordPress大约6年了，所以当我说我卡住了，我是认真的。
我正在尝试向CPT添加自定义元框，boat. 下面是我的代码和错误。
错误消息：
Notice: Undefined variable: boat_make in /path/to/file/wp-content/plugins/syb/admin/class-syb-admin.php on line 150
这两个字段的错误消息相同。
这是我的代码：
/**
* Register all of the hooks related to the admin area functionality
* of the plugin.
*
* @since 1.0.0
* @access private
*/
private function define_admin_hooks() {
...
/**
* Add metabox and register custom fields
*
* @link https://code.tutsplus.com/articles/rock-solid-wordpress-30-themes-using-custom-post-types--net-12093
*/
$this->loader->add_action( \'add_meta_boxes\', $plugin_admin, \'rerender_meta_options\' );
$this->loader->add_action( \'save_post\', $plugin_admin, \'save_meta_options\' );
}
...
/**
* Save Custom Fields
*
* @since 1.0.0
*/
public function save_meta_options() {
if ( ! current_user_can( \'\' ) ) return;
global $post;
update_post_meta($post->ID, "customer_id", $_POST["customer_id"]);
update_post_meta($post->ID, "boat_make", $_POST["boat_make"]);
}
/**
* Create a meta box for our custom fields
*
* @since 1.0.0
*/
public function rerender_meta_options() {
add_meta_box("boat-meta", "Boat Details", array($this, "display_meta_options"), "boat", "normal", "low");
}
/**
* Display meta box and custom fields
*
* @since 1.0.0
*/
public function display_meta_options() {
global $post;
$custom = get_post_custom($post->ID);
var_dump($custom);
if (isset($custom["customer_id"][0])) {
$customer_id = $custom["customer_id"][0];
}
?>
<label><?php _e( \'Boat Colour:\', $this->plugin_name ); ?></label><input name="customer_id" value="<?php echo $customer_id; ?>" /><br>
<?php
if (isset($custom["boat_make"][0])) {
$boat_make = $custom["boat_make"][0];
}
?>
<label><?php _e( \'Boat Make:\', $this->plugin_name ); ?></label><textarea name="boat_make"><?php echo $boat_make; ?></textarea>
<?php
}
加载器方法：
class Syb_Loader {
/**
* The array of actions registered with WordPress.
*
* @since 1.0.0
* @access protected
* @var array $actions The actions registered with WordPress to fire when the plugin loads.
*/
protected $actions;
/**
* The array of filters registered with WordPress.
*
* @since 1.0.0
* @access protected
* @var array $filters The filters registered with WordPress to fire when the plugin loads.
*/
protected $filters;
/**
* Initialize the collections used to maintain the actions and filters.
*
* @since 1.0.0
*/
public function __construct() {
$this->actions = array();
$this->filters = array();
}
/**
* Add a new action to the collection to be registered with WordPress.
*
* @since 1.0.0
* @param string $hook The name of the WordPress action that is being registered.
* @param object $component A reference to the instance of the object on which the action is defined.
* @param string $callback The name of the function definition on the $component.
* @param int $priority Optional. The priority at which the function should be fired. Default is 10.
* @param int $accepted_args Optional. The number of arguments that should be passed to the $callback. Default is 1.
*/
public function add_action( $hook, $component, $callback, $priority = 10, $accepted_args = 1 ) {
$this->actions = $this->add( $this->actions, $hook, $component, $callback, $priority, $accepted_args );
}
/**
* Add a new filter to the collection to be registered with WordPress.
*
* @since 1.0.0
* @param string $hook The name of the WordPress filter that is being registered.
* @param object $component A reference to the instance of the object on which the filter is defined.
* @param string $callback The name of the function definition on the $component.
* @param int $priority Optional. The priority at which the function should be fired. Default is 10.
* @param int $accepted_args Optional. The number of arguments that should be passed to the $callback. Default is 1
*/
public function add_filter( $hook, $component, $callback, $priority = 10, $accepted_args = 1 ) {
$this->filters = $this->add( $this->filters, $hook, $component, $callback, $priority, $accepted_args );
}
/**
* A utility function that is used to register the actions and hooks into a single
* collection.
*
* @since 1.0.0
* @access private
* @param array $hooks The collection of hooks that is being registered (that is, actions or filters).
* @param string $hook The name of the WordPress filter that is being registered.
* @param object $component A reference to the instance of the object on which the filter is defined.
* @param string $callback The name of the function definition on the $component.
* @param int $priority The priority at which the function should be fired.
* @param int $accepted_args The number of arguments that should be passed to the $callback.
* @return array The collection of actions and filters registered with WordPress.
*/
private function add( $hooks, $hook, $component, $callback, $priority, $accepted_args ) {
$hooks[] = array(
\'hook\' => $hook,
\'component\' => $component,
\'callback\' => $callback,
\'priority\' => $priority,
\'accepted_args\' => $accepted_args
);
return $hooks;
}
/**
* Register the filters and actions with WordPress.
*
* @since 1.0.0
*/
public function run() {
foreach ( $this->filters as $hook ) {
add_filter( $hook[\'hook\'], array( $hook[\'component\'], $hook[\'callback\'] ), $hook[\'priority\'], $hook[\'accepted_args\'] );
}
foreach ( $this->actions as $hook ) {
add_action( $hook[\'hook\'], array( $hook[\'component\'], $hook[\'callback\'] ), $hook[\'priority\'], $hook[\'accepted_args\'] );
}
}
}
