gistfile1.php

<?php
function getTaobaoURLFromShortURL($shortURL)
{
    $contents = file_get_contents($shortURL);
    $pattern = '/d="J_Url" value=\'(.+)\'>./';
    preg_match($pattern, $contents, $matches);
    return urldecode($matches[1]);
}

function getItemIdFromURL($itemURL) 
{
    $pattern = '/&id=(\d+)/';
    preg_match($pattern, $itemURL, $matches);
    return $matches[1];
}

function getInfoFromShareMessage($message) 
{
    $split = explode('淘宝商品:', $message);
    $partial = explode(' ', $split[1]);
    return array('title'=> $partial[0], 'shortURL'=> $partial[1]);
}

$shareMessage = "淘宝商品:2015欧美早秋新款女重工钉珠七分袖修身荷叶摆鱼尾裙显瘦连衣裙女 http://b.mashort.cn/S.Ziyfjv?sm=2b65ea (👉👉👉复制整段信息，打开手机淘宝可直接访问👈👈👈) ";

$item = getInfoFromShareMessage($shareMessage);

$shortURL = $item['shortURL'];

$itemURL = getTaobaoURLFromShortURL($shortURL);

print_r($itemURL);
echo "\n";
print_r(getItemIdFromURL($itemURL));
echo "\n";
print_r($item['title']);
echo "\n";