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WordPress hooks can be used in two ways:
using callback function name and appropriate function
add_action( 'action_name', 'callback_function_name' ); function callback_function_name() { // do something } using anonymous function (closure)
add_action( 'action_name', function() { // do something } ); Is there any difference for WordPress what way to use? What is prefered way and why?
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Anonymous functions are often arguments being passed to higher-order functions or used for constructing the result of a higher-order function that needs to return a function. If the function is only used once, or a limited number of times, an anonymous function may be syntactically lighter than using a named function.
The advantage of an anonymous function is that it does not have to be stored in a separate file. This can greatly simplify programs, as often calculations are very simple and the use of anonymous functions reduces the number of code files necessary for a program.
An anonymous function is a function that was declared without any named identifier to refer to it. As such, an anonymous function is usually not accessible after its initial creation. Normal function definition: function hello() { alert('Hello world'); } hello();
In JavaScript, callbacks and anonymous functions can be used interchangeably.
The disadvantage of the anonymous function is that you're not able to remove the action with remove_action.
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.
Because you didn't define function_to_remove, you can't remove it.
So you should never use this inside plugins or themes that somebody else might want to overwrite.
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