<?php

// your code goes here

function xrange($start,$end,$reset=false) {
	static $position = NULL;
	
	if($position == NULL || $reset) {
		$position = 0;
	}
	
	$value = $position+$start;
	
	if($value <= $end) {
		return array($position++, $value);
	} else {
		return array();
	}
}

while(list($key, $value) = xrange(1,10)) {
	echo "$key => $value\n";
}