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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。
可能的挂钩名称包括:
add_post_metadata
add_comment_metadata
add_term_metadata
add_user_metadata
$checknull|bool
-
是否允许为给定类型添加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。
$uniquebool
-
指定的meta键对于对象是否应该是唯一的。
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