Return a random row of data from an ACF repeater field

random-repeater.php

<?php 

	// Get the repeater field
	$repeater = get_field( 'repeater_field_name' );

	// Get a random rows. Change the second parameter in array_rand() to how many rows you want.
	$random_rows = array_rand( $repeater, 2 );

	// Loop through the random rows if more than one is returned
	if( is_array( $random_rows ) ){

		foreach( $random_rows as $random_row ){

			// Output data here. Replace sub field names.
			echo 'Sub Field 1: ' . $repeater[$random_row]['sub_field_1'] . '<br/>';
			echo 'Sub Field 2: ' . $repeater[$random_row]['sub_field_2'] . '<br/><br/>';

		}

	} else {

		// Output data here. Replace sub field names.
		echo 'Sub Field 1: ' . $repeater[$random_rows]['sub_field_1'] . '<br/>';
		echo 'Sub Field 2: ' . $repeater[$random_rows]['sub_field_2'] . '<br/><br/>';

	}

?>

8 years later, this still works great!

9 years later too. Thanks.

To keep ACF syntax, like get_sub_field(), nested repeaters, etc. i suggest to go with this:

<?php

// Randomize and shuffle the rows
$rows = get_field('repeater_field');
shuffle($rows);
$rand_repeater_fields = array_rand( $rows , 4 );
?>

<section>
	<?php if( have_rows('repeater_field') ):
		$stage_index = 0; ?>
	  <?php while ( have_rows('repeater_field') ) : the_row();

			// print rows only if in array
			if (in_array(get_row_index() - 1, $rand_repeater_fields)) { ?>

				<?php // do your stuff ?>
				<?= get_sub_field('repeater_subfeld') ?>

				<?php if( have_rows('another_repeater_field') ): ?>
				  <?php while ( have_rows('another_repeater_field') ) : the_row(); ?>

						<?php // do your stuff ?>
						<?= get_sub_field('another_repeater_subfeld') ?>
						
				  <?php endwhile; ?>
				<?php endif; ?>

			<?php // increment index
				$stage_index++;
			} ?>

	  <?php endwhile; ?>
	<?php endif; ?>
</section>