如何获取第一个“ - ”和第三个“ - ”之间的所有内容？

Question

我有一个漂亮的url链接： www.abcd.com/Topic-V-CNHVNTNCHUUINP-Gangulys-waving-jersey-at-Lords-or-Dhonis-six-to-win-the-world-cup-- - 这是印度板球历史上最大的赢球时刻 - Sourav-Ganguly-Mahendra-Singh-Dhoni

我只想抓取“V-CNHVNTNCHUUINP”。我写的代码不起作用：

$value = "www.abcd.com/Topic-V-CNHVNTNCHUUINP-Gangulys-waving-jersey-at-Lords-or-Dhonis-six-to-win-the-world-cup---Which-was-the-biggest-winning-moment-in-Indian-cricket-history-Sourav-Ganguly-Mahendra-Singh-Dhoni"; 

$newstr = substr($value, 0, strpos($value, '-', strpos($value, '-')+3)); 
$afterunderscore = substr($newstr, strpos($newstr, "-") + 1); 

这是取我：V-CNHVNTNCHUUINP。

但随着链路进行测试时： www.abcd.com/Topic-HN-CNHVNTNCHWTSSW-Sharukh-Khan-or-Salman-Khan---Who-is-the-biggest-superstar-of-bollywood

我得到的结果是：HN。

目标：取HN-CNHVNTNCHWTSSW当链接www.abcd.com/Topic-HN-CNHVNTNCHWTSSW-Sharukh-Khan-or-Salman-Khan---Who-is-the-biggest-巨星 - 宝莱坞的-

Answer 1

这将如预期：

功能strposX将在$haystack返回$number的出现$needle的位置。然后只需使用substr来选择存储在$value变量中的想要的字符串部分。

function strposX($haystack, $needle, $number) { 
    preg_match_all("/$needle/", utf8_decode($haystack), $matches, PREG_OFFSET_CAPTURE); 
    return $matches[0][$number-1][1]; 
} 

$value = "www.abcd.com/Topic-HN-CNHVNTNCHWTSSW-Sharukh-Khan-or-Salman-Khan---Who-is-the-biggest-superstar-of-bollywood"; 

$start = min(strposX($value, '-', 1), strposX($value, '-', 3)); 
$length = abs(strposX($value, '-', 1) - strposX($value, '-', 3)); 

echo substr($value, $start + 1, $length - 1); 

输出：

HN-CNHVNTNCHWTSSW 

Answer 2

你可以使用正则表达式拿到赛：

$value = "www.abcd.com/Topic-HN-CNHVNTNCHWTSSW-Sharukh-Khan-or-Salman-Khan---Who-is-the-biggest-superstar-of-bollywood"; 

// will account for "V-CNHVNTNCHUUINP" and "HN-CNHVNTNCHWTSSW" 
$pattern = "/Topic-([A-Z]+-[A-Z]+)-/"; 
$matches = []; 

preg_match($pattern, $value, $matches); 

if (isset($matches[1])) { 
    // we got a match 
    echo $matches[1]; // prints "HN-CNHVNTNCHWTSSW" 
}