pfSense

<?php

function parse_dhcpd_leases($path) {

	$keys = array("starts", "ends", "binding state", "client-hostname");

	$leases = array();

	$fd = fopen($path, "r");

	$entry = NULL;

	while(!feof($fd)) {

		# ignore empty lines and comments

		list($line, $ignored) = explode("#", $line, 1);

		$line = trim(fgets($fd));

		if (strlen($line) == 0) {

			continue;

		}

		if (1 == sscanf($line, "lease %s {", $ip)) {

			$leases[$ip] = array();

			$entry = &$leases[$ip];

			continue;

		}

		if ($line == "}") {

			unset($entry);

			continue;

		}

		foreach ($keys as $key) {

			if (1 == sscanf($line, $key . " %[^;];", $val)) {

				$entry[$key] = trim($val, '"');

				break;

			}

		}

	}

	return $leases;

}