Parent (functions.php) executes but actions doesn't seem to work

Question

I'm reading this WordPress Theme flow chart.

I've setup a basic parent/child themes in my wordpress.

Child Theme (functions.php)

<?php 

echo "child theme";

Parent Theme (functions.php)

<?php 

echo "top";

function coffee_enqueue_styles() {
    echo "parent theme";
}

add_action('wp_enqueue_scripts', 'coffee_enqueue_styles');

echo "bottom";

So after I activated my child theme and it loads and executes it's functions.php file and print child theme. Then WordPress checks if this theme has a parent, it executes it's functions.php file and in my case it does and prints top and bottom but for some reason it doesn't executes the add_action hook where I'm printing enqueued from parent.

This is the output I get.

Am I missing something? Please guide me. Thanks you.

UPDATE

I changed my action to init and it prints parent theme at the end of bottom. So my action hook is working fine.

Please, Can you please tell me why wp_enqueue_scripts hook is not executing or there is any order behind it?

Answer 1

After checking the core files. I found that in wp-includes/default-filters.php. WordPress is binding wp_enqueue_scripts with wp_head.

Which means wp_enqueue_scripts hook is only going to work when the wp_head hook executes.

So, I was missing wp_head function from the template.