wordpress：如何设置自定义URL AJAX API

Question

我试图在Wordpress上实现自定义JSON API，比如/api3/get_posts，我指的是插件JSON-API的实现，但它不起作用。以下是我的代码：

$myPluginBase = 'api3';

function my_plugin_init() {
    global $wp_rewrite;
    add_filter('rewrite_rules_array', 'my_plugin_rewrites');
    add_action('template_redirect', 'my_plugin_template_rewrite');
    $wp_rewrite->flush_rules();
}

function my_plugin_template_rewrite(){
    global $myPluginBase;
    if( isset( $_REQUEST[ $myPluginBase ] ) ){
        echo $_REQUEST[ $myPluginBase ];
        exit;
    }
}

function my_plugin_activation() {
    // Add the rewrite rule on activation
    global $wp_rewrite;
    add_filter('rewrite_rules_array', 'my_plugin_rewrites');
    $wp_rewrite->flush_rules();
}

function my_plugin_deactivation() {
    // Remove the rewrite rule on deactivation
    global $wp_rewrite;
    $wp_rewrite->flush_rules();
}

function my_plugin_rewrites($wp_rules) {
    global $myPluginBase;
    if (empty($base)) {
        return $wp_rules;
    }
    $my_plugin_rules = array(
        "$myPluginBase\$" => "index.php?{$myPluginBase}=info",
        "$myPluginBase/(.+)\$" => "index.php?{$myPluginBase}=\$matches[1]"
    );
    return array_merge($my_plugin_rules, $wp_rules);
}

// Add initialization and activation hooks
add_action('init', 'my_plugin_init');
register_activation_hook( __FILE__, 'my_plugin_activation');
register_deactivation_hook( __FILE__, 'my_plugin_deactivation');

似乎template_redirect操作有效，当我打开/api3=hello时，服务器将发回hello。但是，如果我尝试打开/api3/hello，它会一直向我显示主页。