考虑插件A：

$A_message;

add_action(\'plugins_loaded\', function() {
    do_action(\'plugin-A:init\');
});

// Hooks allow B to access A (both during initialization of A and elsewhere in WordPress) without having to check if A exists.

add_filter(\'plugin-A:set\', function($msg) {
    $A_message = $msg;
}, PHP_INT_MAX);

add_filter(\'plugin-A:get\', function($msg) {
    return $A_message;
}, PHP_INT_MIN);

add_action(\'plugin-A:init\', function() {
    // We\'re 100% sure that A has loaded (if it exists)
    // Store what Cheech says in A.  (Using a filter allows us to not have to check if A exists).
    do_action(\'plugin-A:set\', "Brent! Open the door!");
});

add_filter(\'the_title\', function($title) {
    // Get something from A (and we don\'t have to check if it exists).
    // If A exists, return what Cheech says; if A does not exist, return what Chong says.
    $title = apply_filters(\'plugin-A:get\', "Dave\'s not here, man!");
    return $title;
});

稍后在代码中请求标题时（如在帖子列表表中）foo_get_bar_message() 和bar_get_message() 将通过以下方式返回在条形图初始化期间设置的条形图值bar_set_message(). 同样，这一切都是在无需Foo插件检查Bar是否存在的情况下完成的。并且，如果该条不存在，将返回Foo默认值。（特别感谢Cheech and Chong 获得灵感。）

Edit: 在上面的例子中，B更多地依赖于A，而不是相反。但是，你要求A依赖于B，同样的概念在这里也成立。考虑将此添加到插件A中：

// This function is used somewhere in plugin-A ...
function a_func() {
    // Not sure if B exists, but we can make B do something if it does.
    do_actions(\'plugin-B:some_func\', \'*knock knock knock*\', \'Who Is It?\');
}

add_action(\'plugin-B:some_func\', function($cheech, $chong) {
    echo \'<p>\'. $cheech .\'<br>\'. $chong .\'</p>\';
}

我已经有了这个最初的构建，甚至在问题出现之前就已经成功了。我现在已经看到了@cjbj和Mort的答案。Mort的频率相同，但是，请听我说：

在我的主插件中A, 哪一个B 将取决于，内部index.php:

add_actions( \'plugins_loaded\', function() {
    $boot = (new Init)->boot();

    if( \\is_wp_error( $boot ) ) {
        return False;
    }

    /**
    * Fire if the plugin has successfully loaded itself.
    */
    do_action( \'plugin-A:init\' );
});

add_action( \'plugin-A:init\', function() {
    //Great, so, we\'re 100% sure that A has successfully loaded.
});

事实上，我使用了一些非常简单的东西，因为我有一个插件，用于多种用途，开发主题/插件，所以我只需在其中定义一个常量（例如\\u常量），然后说我有另一个插件，它依赖于它进行多个操作，可能plugins_loaded 可能没有帮助，所以在插件定义之后，我检查是否定义了该常量，如果没有！？只需终止脚本，然后您将只有插件在插件页面中列出，但就像它是一个全新的空插件一样。一旦依赖的插件处于活动状态，依赖的插件就会正常工作。

类似这样：

<?php
/**
 * Plugin Name: Plugin name
 */

/**
 * Display a notification if one of required plugins is not activated/installed
 */
add_action( \'admin_notices\', function() {
    if (!defined(\'THE_CONSTANT\')) {
        ?>
        <div class="notice notice-error is-dismissible">
            <p><?php esc_html_e( \'Please activate/install {Wanted plugin name} , for this plugin can work properly\' ); ?></p>
        </div>
    <?php }
});


if (!defined("THE_CONSTANT")) return;