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挂钩名称的动态部分$meta_type指的是meta对象类型（post、comment、term、user或具有相关meta表的任何其他类型）。
返回非空值将有效地短路该函数。
可能的钩子名称包括：
delete_post_metadatadelete_comment_metadatadelete_term_metadatadelete_user_metadata
$deletenull|bool-
是否允许删除给定类型的meta数据。
$object_idint-
meta数据关联的对象ID。
$meta_keystring-
meta数据键。
$meta_valuemixed-
meta数据值。如果非标量，则必须是可序列化的。
$delete_allbool-
是否删除所有对象的匹配meta数据条目，忽略指定的$object_id.
默认 false
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