WordPress 钩子中的匿名函数 [英] Anonymous functions in WordPress hooks

问题描述

WordPress hooks 有两种使用方式:

WordPress hooks can be used in two ways:

1. 使用回调函数名和合适的函数

1. using callback function name and appropriate function

add_action( 'action_name', 'callback_function_name' );
function callback_function_name() {
    // do something
}

使用匿名函数(闭包)

using anonymous function (closure)

add_action( 'action_name', function() {
    // do something
} );

WordPress 使用方式有什么不同吗?什么是首选方式，为什么?

Is there any difference for WordPress what way to use? What is prefered way and why?

推荐答案

匿名函数的缺点是您无法使用 remove_action.

The disadvantage of the anonymous function is that you're not able to remove the action with remove_action.

重要提示:要删除挂钩，$function_to_remove 和 $priority 参数必须在添加挂钩时匹配.这适用于过滤器和操作.删除失败时不会发出警告.

Important: To remove a hook, the $function_to_remove and $priority arguments must match when the hook was added. This goes for both filters and actions. No warning will be given on removal failure.

因为你没有定义function_to_remove，所以你不能删除它.

Because you didn't define function_to_remove, you can't remove it.

所以你永远不应该在其他人可能想要覆盖的插件或主题中使用它.

So you should never use this inside plugins or themes that somebody else might want to overwrite.

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