通过PHP从网站提取数据 [英] Extract data from website via PHP

问题描述

我想为一些朋友创建一个简单的警报应用程序。

I am trying to create a simple alert app for some friends.

基本上我想从一个提取数据价格和库存可用性网址如下所示：

Basically i want to be able to extract data "price" and "stock availability" from a webpage like the folowing two:

• http://www.sparkfun.com/commerce/product_info.php?products_id=5


• http://www.sparkfun.com/commerce/product_info.php?products_id=9279

• http://www.sparkfun.com/commerce/product_info.php?products_id=5
• http://www.sparkfun.com/commerce/product_info.php?products_id=9279

我已经通过电子邮件和短信部分发出警报，但现在我想能够获得数量和价格网页（这2个或任何其他），以便我可以比较价格和数量可用，并提醒我们，如果一个产品在某些阈值之间订购。

I have made the alert via e-mail and sms part but now i want to be able to get the quantity and price out of the webpages (those 2 or any other ones) so that i can compare the price and quantity available and alert us to make an order if a product is between some thresholds.

已经尝试过一些regex（在一些教程中找到，但我的方式太n00b为此），但没有设法得到这个工作，任何好的提示或示例？

I have tried some regex (found on some tutorials, but i an way too n00b for this) but haven't managed to get this working, any good tips or examples?

推荐答案

$content = file_get_contents('http://www.sparkfun.com/commerce/product_info.php?products_id=9279');

preg_match('#<tr><th>(.*)</th> <td><b>price</b></td></tr>#', $content, $match);
$price = $match[1];

preg_match('#<input type="hidden" name="quantity_on_hand" value="(.*?)">#', $content, $match);
$in_stock = $match[1];

echo "Price: $price - Availability: $in_stock\n";

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