Display a single row from nested array of custom field data

Question

I built an Exercise custom post type with a custom field group using Advanced Custom Fields. The structure uses repeater fields for Week, Day, and Exercise, which creates a series of nested arrays. It looks like this:

Week 1
-- Day 1
---- Exercise 1
---- Exercise 2
-- Day 2
---- Exercise 1
---- Exercise 2
-- Day 3
---- Exercise 1
---- Exercise 2
Week 2
-- Day 1
---- Exercise 1
---- Exercise 2
-- Day 2
---- Exercise 1
---- Exercise 2
-- Day 3
---- Exercise 1
---- Exercise 2

I am able to display all of the contents using nested while loops, but what I want to do is display a singe Day's exercises.

The final page will look like this:

Week 2
Day 3
List of exercises

I have tried different ways to limit output, including using a counter, but that only allows me to stop after X rows. I tried using array_slice, which worked fine on the outer most array level for Weeks, but did not work on the inner arrays.

Any idea how I can display a specific day?

Answer 1

I figured it out using a While loop and an If statement with a counter. This solution uses functions from Advanced Custom Fields;

$i = 0;  
while have_rows('week_rows') ): the_row();  
  $i++;  

  if( $i == 5 ) {  // stops on the 5th row of 'week_rows' array
    break;  
  }  

endwhile; // I had to move the endwhile up before my display statements 

// add display statements here to display array contents from 5th array row

?>