Question

我想从变量中找到一个ID并将其保存到另一个变量中。但是，这个id在其他所有数字中都处于中间位置，我不知道如何定位它。

$f_contents = file("links.txt");
$url = $f_contents[mt_rand(0, count($f_contents) - 1)];

echo $url;

// $url will output something similar to:

// http://store.steampowered.com/app/24010/?snr=1_5_9__400
// or..
// http://store.steampowered.com/app/275200/?snr=1_5_9__400
// or..
// http://store.steampowered.com/app/275830/?snr=1_5_9__400
// and so on.

// $gameid = 24010; (or the other ids)

如何在app /之前/之后获取该ID号？在这种特殊情况下，24010,275200或275830。

Answer 1

您可以使用正则表达式：

$url = 'http://store.steampowered.com/app/24010/?snr=1_5_9__400';
preg_match('~/app/(.*)/~', $url, $matches);

echo $matches[1]; //outputs 24010

Answer 2

以下是如何使用爆炸功能获得您想要的数字（$ gameid）。

如果$ url是一个url数组，你应该在foreach中循环。

4.In the Add Filter Mapping dialog, select one of the following dispatcher types:

REQUEST: Only when the request comes directly from the client
FORWARD: Only when the request has been forwarded to a component (see Transferring Control to Another Web Component)
INCLUDE: Only when the request is being processed by a component that has been included (see Including Other Resources in the Response)
ERROR: Only when the request is being processed with the error page mechanism (see Handling Servlet Errors)

Answer 3

已经有两个非常好的答案，但这是另一个选择。由于它是一个网址，因此您可以使用parse_url：

$parsed = parse_url($url);

会给你一个像这样的数组：

array (size=4)
  'scheme' => string 'http' (length=4)
  'host' => string 'store.steampowered.com' (length=22)
  'path' => string '/app/275200/' (length=12)
  'query' => string 'snr=1_5_9__400' (length=14)

然后你可以{app}'关闭'app'并从路径斜杠获取id。

$gameid = trim($parsed['path'], '/app');

将部分变量保存到另一个变量

3 个答案: