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Wordpressframework~20 mins

Action hooks in Wordpress - Practice Problems & Coding Challenges

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Challenge - 5 Problems
🎖️
Action Hook Master
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Test your skills under time pressure!
component_behavior
intermediate
2:00remaining
What happens when this WordPress action hook runs?
Consider the following code snippet added to a WordPress theme's functions.php file. What will be the output on the page when the 'wp_footer' action runs?
Wordpress
<?php
add_action('wp_footer', function() {
    echo '<p>Footer message</p>';
});
?>
ANothing appears because 'wp_footer' is not a valid action hook.
BA PHP error occurs because anonymous functions cannot be used with add_action.
CThe text '<p>Footer message</p>' appears at the bottom of the page inside the footer section.
DThe text appears at the top of the page before the header.
Attempts:
2 left
💡 Hint
Think about where the 'wp_footer' hook is triggered in a WordPress theme.
📝 Syntax
intermediate
1:30remaining
Which option correctly adds a function to a WordPress action hook?
You want to run a function named 'my_custom_function' when the 'init' action hook fires. Which code snippet correctly does this?
Aadd_action(my_custom_function, 'init');
Badd_action('init', 'my_custom_function');
Cadd_action('init', my_custom_function());
Dadd_action('init', function my_custom_function() {});
Attempts:
2 left
💡 Hint
Remember the order of parameters for add_action is hook name, then function name as a string.
🔧 Debug
advanced
2:00remaining
Why does this action hook not run the function?
Look at this code snippet. The function 'add_custom_message' is not running when expected. What is the cause?
Wordpress
<?php
function add_custom_message() {
    echo '<p>Hello!</p>';
}
// Missing add_action call here
?>
AThe function runs automatically without hooking, so the problem is elsewhere.
BThe function name is invalid and causes a fatal error.
CThe echo statement is inside a function, so it cannot output anything.
DThe function is defined but never hooked to any action, so it never runs.
Attempts:
2 left
💡 Hint
Think about how WordPress knows when to run your function.
state_output
advanced
2:00remaining
What is the output order of these hooked functions?
Given these two functions hooked to 'wp_head' with different priorities, what is the order of their output?
Wordpress
<?php
add_action('wp_head', function() { echo 'First'; }, 20);
add_action('wp_head', function() { echo 'Second'; }, 10);
?>
ASecondFirst
BFirstSecond
CThey output simultaneously causing an error.
DNo output because 'wp_head' is not triggered.
Attempts:
2 left
💡 Hint
Lower priority numbers run earlier.
🧠 Conceptual
expert
1:30remaining
What error occurs if you remove a non-existent action hook?
What happens if you call remove_action('init', 'non_existent_function') in your WordPress code?
Wordpress
remove_action('init', 'non_existent_function');
ANo error occurs; WordPress silently ignores it.
BA fatal error occurs because the function does not exist.
CA warning is shown about the missing function.
DThe 'init' hook is disabled completely.
Attempts:
2 left
💡 Hint
Think about how WordPress handles removing hooks that were never added.