因此，有以下情况。

我需要在admin_notices.

class MyPlugin_Admin {
    public static function render_admin_notice() {
        echo $name . \' has been upgraded.\';
    }
}

add_action( \'admin_notices\', array( \'MyPlugin_Admin\', \'render_admin_notice\' ) );

如何填充$name?

我考虑以下解决方案：

1号：

class MyPlugin_Admin {

    public static $name;

    public static function render_admin_notice() {
        echo self::$name . \' has been upgraded.\';
    }
}

MyPlugin_Admin::$name = \'John Doe\';

add_action( \'admin_notices\', array( \'MyPlugin_Admin\', \'render_admin_notice\' ) );

第2条：

$name = \'John Doe\';

add_action(\'admin_notices\', function() use ($name){ 
    echo $name . \' has been upgraded.\'; 
});

不知何故，我不喜欢两者，因为1号需要$name 待填充class 宽，因此可能会导致混淆，2号至少需要PHP 5.3。

class WPSE_224485_Message {
    private $_message;

    function __construct( $message ) {
        $this->_message = $message;

        add_action( \'admin_notices\', array( $this, \'render\' ) );
    }

    function render() {
        printf( \'<div class="updated">%s</div>\', $this->_message );
    }
}

if ( $done ) {
    new WPSE_224485_Message( "$name has been upgraded." );
}

$message = $name . \' has been upgraded.\';

add_settings_error( \'my_admin_notice\', \'my_admin_notice\', $message, \'updated\' );