Time interval output (works) to populate select field

• YorlinqNL

• November 25, 2020 at 7:00 pm

I have an option page with 2 fields.

A number field for the time interval:
booking_settings_openings_hours_interval

And a repeater field with 2 subfields:
booking_settings_opening_hours_start
booking_settings_opening_hours_end

The code below creates a list of all times (with interval X) from START to END time to populate a select field. The interval code works great but it doesn’t populate the select field with these time options.

But when I replace:

// explode the value so that each line is a new array piece
$choices = explode("\n", $choices);

with this:

// explode the value so that each line is a new array piece
echo explode("\n", $choices);

it does populate the select field but that’s not the way how to do it right..?

function yl_load_booking_time_field_choices( $field ) {

	// reset choices
	$field['choices'] = array();

	$minutes = get_field('booking_settings_openings_hours_interval', 'booking_settings');

    // get the value from options page without any formatting
	if( have_rows('booking_settings_opening_hours', 'booking_settings') ) :
		while ( have_rows('booking_settings_opening_hours', 'booking_settings') ) : the_row();

			$start		= get_sub_field('booking_settings_opening_hours_start', 'booking_settings');
			$end		= get_sub_field('booking_settings_opening_hours_end', 'booking_settings');

			$startDate	= DateTime::createFromFormat('H:i', $start);
			$endDate	= DateTime::createFromFormat('H:i', $end);
			$interval	= new DateInterval('PT'.$minutes.'M');
			$dateRange	= new DatePeriod($startDate, $interval, $endDate);

			$choices = array();

			foreach ($dateRange as $date) {
				$dates = $date->format('H:i');
				$choices[] = $dates;
			}

			// explode the value so that each line is a new array piece
			$choices = explode("\n", $choices);

			// remove any unwanted white space
			$choices = array_map('trim', $choices);

			// loop through array and add to field 'choices'
			if( is_array($choices) ) {
				foreach( $choices as $choice ) {
					$field['choices'][ $choice ] = $choice;
				}
			}

		endwhile;
	endif;

	// return the field
	return $field;

}

add_filter('acf/load_field/name=booking_time', 'yl_load_booking_time_field_choices');