我应该在PHP（WordPress）中使用带有匿名函数的可调用/回调吗？

Question

I've been using wordpress for a long time.

In wordpress, there are many cases which we may use callbacks, for example:

add_action('wp_init', 'action_on_init');

function action_on_init() {
    echo "Hello world!";
}

The above style is the most common style in WordPress.

But I think adding such a function name to a global context is however a bit dirty.

So I turned to write in an alternative way:

add_action('wp_init', function() {
    echo "Hello world!";
});

This style is a bit like javascript does. And it prevents namespace pollution.

But in fact I rarely saw any other people code like this, what's the point NOT using this? Or can I feel free to code in this way?

Answer 1

Anonymous function was introduced in PHP 5.3.0 and a lot of sites are still running in older version that is why not many people use it. And you're not able to remove the action with remove_action if you use anonymous function.