PHP Function to show week days range from a given array of week days

show_days.php

function show_days($days = array()) {
	$days_array = array(
		1 => 'Saturday',
		2 => 'Sunday',
		3 => 'Monday',
		4 => 'Tuesday',
		5 => 'Wednesday',
		6 => 'Thursday',
		7 => 'Friday',
	);

	$possibilities = array();

	foreach ($days as $key => $value) {
		$possibilities[$value][] = intval($value);

		for ($i = $value + 1; $i != $value; $i++) {
			if ($i == 8 && $value == 7)
				$i = 1;

			if (!in_array($i, $days)) {
				break;
			}

			$possibilities[$value][] = $i;

			if ($i == 7)
				$i = 0;
		}
	}

	foreach ($possibilities as $key => $value) {
		foreach ($possibilities as $key_inner => $value_inner) {
			if ($key == $key_inner) {
				continue;
			}

			if (in_array($key, $value_inner)) {
				unset($possibilities[$key]);
			}
		}
	}
	$return = array();
	foreach ($possibilities as $key => $value) {
		$count = count($value);
		if ($count == 1) {
			$return[] = $days_array[$value[0]];
		}
		elseif ($count == 2) {
			$return[] = str_replace(array_keys($days_array), $days_array, implode(', ', $value));
		}
		elseif ($count == 7) {
			$return[] = 'Everyday';
		} else {
			$value = array_values($value);

			$first = array_shift($value);
			$last = array_pop($value);
			$return[] = str_replace(array_keys($days_array), $days_array, $first . ' to ' . $last);
		}
	}
	return implode(' And ', $return);
}