如何讓只有一些href屬性

我有我想要提取一些信息，這個PHP代碼，但我停下來HREF步：如何讓只有一些href屬性

$site = "http://www.sports-reference.com/olympics/countries"; 
$site_html = file_get_html($site); 

$country_dirty = $site_html->getElementById('div_countries'); 

     foreach($country_dirty->find('img') as $link){ 

      $country = $link->alt; 
      $link_country = "$site/$country"; 
      $link_country_html = file_get_html($link_country); 

      $link_season = $link_country_html->getElementById('div_medals'); 

       foreach($link_season->find('a') as $season){ 


        echo $link_year_season = $season->href . "\n"; 

        //echo $link_season = strstr ($link_year_season,'summer') . "\n"; 

       } 
      }

變量$ link_year_season讓我以下的輸出：

/olympics/countries/AFG/summer/2012/ 
/olympics/athletes/ba/nesar-ahmad-bahawi-1.html 
/olympics/athletes/ni/rohullah-nikpai-1.html 
/olympics/countries/AFG/summer/2008/ 
/olympics/athletes/ba/nesar-ahmad-bahawi-1.html 
/olympics/athletes/ni/rohullah-nikpai-1.html 
/olympics/countries/AFG/summer/2004/ 
/olympics/countries/AFG/summer/1996/ 
/olympics/countries/AFG/summer/1988/ 
/olympics/countries/AFG/summer/1980/ 
/olympics/countries/AFG/summer/1972/ 
.....

我想知道是否有可能獲得僅此輸出：

/olympics/countries/AFG/summer/2012/ 
/olympics/countries/AFG/summer/2008/ 
/olympics/countries/AFG/summer/2004/ 
/olympics/countries/AFG/summer/1996/ 
/olympics/countries/AFG/summer/1988/ 
/olympics/countries/AFG/summer/1980/ 
/olympics/countries/AFG/summer/1972/

來源

2016-02-25 Idro

這樣做的一個快速方法是在輸出中應用'preg_match'或'strpos'或類似的東西，您已經得到了。 – Maximus2012

下面的答案是否可以解決您的問題？ http://meta.stackexchange.com/questions/5234/how-does-accepting-an-answer-work – chris85

你應該是AB le使用此正則表達式檢查鏈接是否以/olympics/countries/AFG/summer/開頭，然後是數字和/。

foreach($link_season->find('a') as $season){ 
    if(preg_match('~^/olympics/countries/AFG/summer/\d+/~', $season->href)) { 
     echo $link_year_season = $season->href . "\n"; 
     //echo $link_season = strstr ($link_year_season,'summer') . "\n"; 
    } 
}

演示：https://regex101.com/r/bZ1vP3/1

您還可以通過捕獲夏天后的數字拉本年度（假設爲一年，第一正則表達式只檢查數量這一個是嚴格）..

foreach($link_season->find('a') as $season){ 
     if(preg_match('~^/olympics/countries/AFG/summer/(\d{4})/~', $season->href, $year)) { 
      echo $link_year_season = $season->href . "\n"; 
      //echo $link_season = strstr ($link_year_season,'summer') . "\n"; 
      echo 'The year is ' . $year[1] . "\n"; 
     } 
}

如果季節也可以變化，你可以做(?:summer|winter)這將允許summer或winter成爲第四個目錄。

來源

2016-02-25 16:32:11 chris85

如果你想允許任何國家和任何季節，你可以做'^ \/olympics \/countries \/[AZ] + \ /（？：summer | winter）\/\ d {4} \ /'，假設夏季和冬季是奧運會發生的唯一季節;） – shamsup

如何讓只有一些href屬性

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