The name of a filter hook provided by WordPress, which defines when your filter should be applied.
hook_name参数是WordPress提供的Filter Hook（过滤器钩子）名称，这决定了你的函数在何时发挥作用。
The last step in getting your filter hook to work is to install the file and activate the plugin.
让你的Filter Hook开始工作的最后一步是安装插件文件和激活插件。
Hook_name is the name of a filter hook provided by WordPress, which defines when your filter should be applied.
hook_name参数是WordPress提供的Filter hook(过滤器钩子)名称，这决定了你的函数在何时发挥作用。
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