如何在wordpress插件中绑定到动作钩子的函数之间传递我自己的变量

Question

I am writing a Wordpress plugin in PHP and I want to be able to use a variable that is not provided in the action hook (of other separate) plugin. I want to pass a variable from one hook to another.

These functions are in my functions.php file (not the theme functions file).

I cannot nest the action hooks because they happen at different times, specifically, the one with the variable happens after the one with where I want it.

I don't think I can use a closure because the variable is inside another hook.

I can't use a class because if I set the class in action 1 then it's not in scope in action 2 and I need to make a new one.

I could use a global or access the DB but I feel like there should be a better way than either of those.

action 1 - my plugin

function foo($level){
  do stuff
}
add_action('change-membership', 'foo');

action 2 - my plugin

function bar(){
  if($level==0){
    do stuff
  }
}
add_action('put-in-checkout-text', 'bar');

Other devs plugin

do_action('change_membership', $level);

// a little later
do_action('put_in_checkout_text');

$levels exists at the time I want it - but there is no action hook at that point to grab it.

Answer 1

What I understand is you have something like this:

// Plugin 2, the plugin you are writing.
do_action('put_in_checkout'); // --> bar()

// Plugin 1, another author's plugin
$level = "definition of level";
do_action('change_membership', $level); // --> foo($level)

You say you need to access to $level before the change_membership action happens, so $level may not be defined at that time. Even if it was, it may be in a scope not reachable from put_in_checkout handler functions. Just in case, check if plugin 2 instanciates a global variable where you have access to the value of $level . Otherwise, you need to take it from the database (if it is stored there) or generate it somehow.