ACF Textarea to array by newlines

acf-textarea-array-newlines.php

<?php
/**
 * Add `array`, `arrayupper`, and `arraylower` options to textarea output
 *
 * @param $value
 * @param $post_id
 * @param $field
 * @return array|mixed
 */
add_filter( 'acf/format_value/type=textarea', function ( $value, $post_id, $field ) {
	switch ( $field[ 'new_lines' ] ) {
		case 'array':
			return preg_split( "/\r\n|\n|\r/", $value );
		case 'arrayupper':
			return array_map( 'strtoupper', preg_split( "/\r\n|\n|\r/", $value ) );
		case 'arraylower':
			return array_map( 'strtolower', preg_split( "/\r\n|\n|\r/", $value ) );
	}

	return $value;
} );