火车余票查询的API，12306官方的API

代码

<?php
/**
 *火车票查询方法 简单尝试
 *
 * @copyright           widuu
 * @license             http://www.widuu.com
 * @lastmodify          2013-6-20
 */
 
function json_array($json){
        if($json){
            foreach ((array)$json as $k=>$v){
                $data[$k] = !is_string($v)? json_array($v):$v;
            }
            return $data;
        }
    }
function doget ($start,$end,$time) // get获取数据使用
    {
        if(empty($time)){
            $time = date('Y-m-d',time());
        }else{
            if(substr($time,0,1)!=0){
                $time = date('Y-0',time()).$time;
                echo substr($time,0,1);
            }else{
                $time = date('Y-',time()).$time;
            }
        }
        $name = include ("../name.php");
        $star = $name[$start];
        $end = $name[$end];
        $url = "http://dynamic.12306.cn/otsquery/query/queryRemanentTicketAction.do?method=queryLeftTicket&orderRequest.train_date={$time}&orderRequest.from_station_telecode={$star}&orderRequest.to_station_telecode={$end}&orderRequest.train_no=&trainPassType=QB&trainClass=QB%23D%23Z%23T%23K%23QT%23&includeStudent=00&seatTypeAndNum=&orderRequest.start_time_str=00%3A00--24%3A00";
        $optionget = array('http' => array('method' => "GET", 'header' => "User-Agent:Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0; SLCC1; .NET CLR 2.0.50727; Media Center PC 5.0; .NET CLR 3.5.21022; .NET CLR 3.0.04506; CIBA)\r\nAccept:*/*\r\nReferer:http://dynamic.12306.cn/otsquery/query/queryRemanentTicketAction.do?method=init")); 
        $file = file_get_contents($url, false , stream_context_create($optionget));
        return json_array(json_decode($file));
    }
    $result = doget("北京","廊坊","6-23");
    $result = strip_tags($result['datas']);
    $return_str = str_replace("&nbsp;","",$result);
    $return_str = str_replace("\\n","",$return_str);
    $a = explode(",",$return_str);
    $name =array();
    $c = array_chunk($a,16);
    array_pop($c);
    foreach($c as $k =>$v){
        $str="余票：<br>商务座:".$v[5]."，特等座:".$v[6]."，一等座:".$v[7]."，二等座:".$v[8]."，高级软卧:".$v[9]."，软卧:".$v[10]."，硬卧:".$v[11]."，软座:".$v[12]."，硬座:".$v[13]."，无座:".$v[14]."，其他:".$v[15];
        $str = preg_replace("/，硬座\:--，/","",$str);
        $str = preg_replace("/商务座\:--，/","",$str);
        $str = preg_replace("/，特等座\:--，/","",$str);
        $str = preg_replace("/，一等座\:--，/","",$str);
        $str = preg_replace("/，二等座\:--，/","",$str);
        $str = preg_replace("/，高级软卧\:--，/","",$str);
        $str = preg_replace("/，软卧\:--，/","",$str);
        $str = preg_replace("/，硬卧\:--，/","",$str);
        $str = preg_replace("/，软座\:--，/","",$str);
        $str = preg_replace("/，硬座\:--，/","",$str);
        $str = preg_replace("/，其他\:--/","",$str);
        echo "车次:{$v[1]},发站：{$v[2]}，到站：{$v[3]}，历时：{$v[4]}，<br>{$str}<br>";
    }