WordPress函数文件Functions.php教程指南：定义、使用、替代方案及实例
define('EBML_ID_CLUSTERSIMPLEBLOCK', 0x23); // [A3] -- Similar to Block but without all the extra information, mostly used to reduced overhead when no extra feature is needed.
EBML_ID_CLUSTERSIMPLEBLOCK：这是一个WordPress常量，用于描述媒体文件中简单块的信息。
define('EBML_ID_CLUSTERSIMPLEBLOCK', 0x23); // [A3] -- Similar to Block but without all the extra information, mostly used to reduced overhead when no extra feature is needed.
