Function that returns the largest array of consecutive numbers. Uses numerical keys.

gistfile1.txt

<?php
function get_largest_consecutive_number_array($array) {
	$result = array();
	$total_elements = count($array);

	foreach ($array as $key => $element) {
		$temp = array($element);
		$next_key = $key + 1;
		while($next_key < $total_elements) {
			if ($array[$next_key] === $array[$next_key - 1] + 1) {
				$temp[] = $array[$next_key];
				$next_key++;
			} else {
				break;
			}
		}

		$total_temp = count($temp);
		$total_result = count($result);
		if ( $total_temp > $total_result ) {
			$result = $temp;
		} elseif( $total_temp == $total_result && $temp[0] > $result[0] ) {
			$result = $temp;
		}
	}

	return $result;
}
?>