-2

我需要磁铁链接中的两个项目：

magnet:?xt=urn:btih:0eb69459a28b08400c5f05bad3e63235b9853021&dn=Splinter.Cell.Blacklist-RELOADED&tr=udp%3A%2F%2Ftracker.com%3A80&tr=udp%3A%2F%2Ftracker.publicbt.com%3A80&tr=udp%3A%2F%2Ftracker.istole.it%3A6969&tr=udp%3A%2F%2Ftracker.ccc.de%3A80&tr=udp%3A%2F%2Fopen.demonii.com%3A1337

的值btih：

0eb69459a28b08400c5f05bad3e63235b9853021

和第一个的价值udp：

udp://tracker.com:80

如何用 PHP 做到这一点？

4

2 回答 2

6

由于parse_url()在这种情况下无济于事，因此您必须使用正则表达式来解析字符串，然后进一步操作字符串以获取跟踪器。所以像：

<?php 
$string = 'magnet:?xt=urn:btih:0eb69459a28b08400c5f05bad3e63235b9853021&dn=Splinter.Cell.Blacklist-RELOADED&tr=udp%3A%2F%2Ftracker.com%3A80&tr=udp%3A%2F%2Ftracker.publicbt.com%3A80&tr=udp%3A%2F%2Ftracker.istole.it%3A6969&tr=udp%3A%2F%2Ftracker.ccc.de%3A80&tr=udp%3A%2F%2Fopen.demonii.com%3A1337';

preg_match('#magnet:\?xt=urn:btih:(?<hash>.*?)&dn=(?<filename>.*?)&tr=(?<trackers>.*?)$#', $string, $magnet_link);

//0eb69459a28b08400c5f05bad3e63235b9853021
echo $magnet_link['hash'];

//Splinter.Cell.Blacklist-RELOADED
echo $magnet_link['filename'];

/*[trackers] => Array
(
    [0] => udp://tracker.com:80
    [1] => udp://tracker.publicbt.com:80
    [2] => udp://tracker.istole.it:6969
    [3] => udp://tracker.ccc.de:80
    [4] => udp://open.demonii.com:1337
)
*/
$magnet_link['trackers'] = explode('&', urldecode(str_replace('tr=','', $magnet_link['trackers'])));

//so to get first tracker
$magnet_link['trackers'][0];
?>
于 2014-04-19T01:23:10.000 回答
3

正如问题评论中所建议的那样，似乎有几个现有的磁力链接库 - 你可能应该看看这些。

但是，如果您想自己做，一种方法是对值进行正则表达式。让我们假设您的磁力链接被分配给一个变量$link，如下所示：

$link ='magnet:?xt=urn:btih:0eb69459a28b08400c5f05bad3e63235b9853021&dn=Splinter.Cell.Blacklist-RELOADED&tr=udp%3A%2F%2Ftracker.com%3A80&tr=udp%3A%2F%2Ftracker.publicbt.com%3A80&tr=udp%3A%2F%2Ftracker.istole.it%3A6969&tr=udp%3A%2F%2Ftracker.ccc.de%3A80&tr=udp%3A%2F%2Fopen.demonii.com%3A1337';

获取每个值的一种快速方法是为每个值单独运行preg_match()- 您可以组合两个正则表达式并运行preg_match_all()，但让我们保持基本。我们将使用lookbehind assertions 来尝试找到所需的值。

// your magnet link
$link = 'magnet:?xt=urn:btih:0eb69459a28b08400c5f05bad3e63235b9853021&dn=Splinter.Cell.Blacklist-RELOADED&tr=udp%3A%2F%2Ftracker.com%3A80&tr=udp%3A%2F%2Ftracker.publicbt.com%3A80&tr=udp%3A%2F%2Ftracker.istole.it%3A6969&tr=udp%3A%2F%2Ftracker.ccc.de%3A80&tr=udp%3A%2F%2Fopen.demonii.com%3A1337';

// urls are encoded, let's reverse that
$link = urldecode($link); 

// first regex searches for 'btih:' and matches subsequent 
// word characters ([a-zA-Z0-9_])
// match(es) are captured as an array to $matchBtih
preg_match('/(?<=btih:)\w+/', $link, $matchBtih);

// same again, more or less, capturing word characters, colon and full-stop
// match(es) are captured as an array to $matchUdp
preg_match('/(?<=tr=)udp:\/\/[\w\:\.]+/', $link, $matchUdp);

// show results
var_dump($matchBtih, $matchUdp);

应该产生：

array (size=1)
  0 => string '0eb69459a28b08400c5f05bad3e63235b9853021' (length=40)
array (size=1)
  0 => string 'udp://tracker.com:80' (length=20)

希望这可以帮助 ：）

于 2014-04-19T01:24:00.277 回答