Hook priority and arguments in Wordpress - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of hook priority in WordPress?

Hook priority controls the order in which functions attached to the same hook run. Lower numbers run first, higher numbers run later.

beginner

How do you specify the priority of a function attached to a WordPress hook?

You specify priority as the third argument in add_action() or add_filter(). For example: add_action('init', 'my_function', 10); where 10 is the priority.

intermediate

What does the 'accepted_args' parameter do in add_action() or add_filter()?

It tells WordPress how many arguments your hooked function can accept from the hook. This is the fourth argument in add_action() or add_filter().

intermediate

If two functions are hooked to the same action with the same priority, which one runs first?

They run in the order they were added. The function added first runs first.

beginner

Why might you want to change the priority of a hooked function?

To control when your function runs relative to others. For example, to run before or after another function hooked to the same action or filter.

What is the default priority if you don't specify one in add_action()?

A 0

B 1

C 100

D 10

The default priority in WordPress hooks is 10 if you don't specify it.

Which argument number in add_filter() sets how many arguments your function accepts?

A 3rd

B 4th

C 2nd

D 1st

The 4th argument in add_filter() or add_action() sets the number of accepted arguments.

If you want your function to run after all others hooked to the same action, what should you do?

A Use a lower priority number

B Use the default priority

C Use a higher priority number

D Remove other hooks

Higher priority numbers run later, so use a higher number to run after others.

What happens if your hooked function accepts fewer arguments than the hook provides?

A It ignores extra arguments

B WordPress stops running hooks

C It receives all arguments anyway

D It causes an error

Your function will ignore extra arguments it does not accept.

How do you hook a function to run with priority 5 and accept 2 arguments?

A add_action('hook', 'func', 5, 2);

B add_action('hook', 'func', 5);

C add_action('hook', 'func', 2, 5);

D add_action('hook', 'func', 2);

The third argument is priority (5), the fourth is accepted args (2).

Explain how hook priority affects the order of function execution in WordPress hooks.

Think about how you decide who goes first in a line.

Describe how to control the number of arguments your hooked function receives and why it matters.

Consider how many pieces of information your function needs.