add_action accept array as first argument

[madeinua]

Would be a great possibility to allow accept first argument of the function add_action as array:

Instead of this:

add_action('action_1', 'myfunc');
add_action('action_2', 'myfunc');
add_action('action_3', 'myfunc');

have this:

add_action(['action_1', 'action_2', 'action_3'], 'myfunc');

Of course foreach() also can be solution for this case but this option is more elegance.

[swissspidy]

Duplicate of #14280.