php 如何抓到下面内容的城市，和天气信息

Question

<?
$str = '<div style="display: block;" class="blkS3" id="data0_0">
    <table cellspacing="0" width="100%">
 <tbody><tr>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%B1%B1%BE%A9&amp;dpc=1" target="_blank" class="fL">北京</a></dt>
     <dd class="dd1">阴转晴</dd>
     <dd>10℃～1℃</dd>
    </dl>
    <div class="clearit"></div>  </td>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%CC%EC%BD%F2&amp;dpc=1" target="_blank" class="fL">天津</a></dt>
     <dd class="dd1">雨夹雪转晴</dd>
     <dd>6℃～-1℃</dd>
    </dl>
    <div class="clearit"></div>  </td>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%CA%AF%BC%D2%D7%AF&amp;dpc=1" target="_blank" class="fL">石家庄</a></dt>
     <dd class="dd1">晴</dd>
     <dd>9℃～3℃</dd>
    </dl>
    <div class="clearit"></div>  </td>
 </tr>
 <tr>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%B1%A3%B6%A8&amp;dpc=1" target="_blank" class="fL">保定</a></dt>
     <dd class="dd1">阴转晴</dd>
     <dd>8℃～-1℃</dd>
    </dl>
    <div class="clearit"></div>  </td>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%B0%FC%CD%B7&amp;dpc=1" target="_blank" class="fL">包头</a></dt>
     <dd class="dd1">晴</dd>
     <dd>7℃～-6℃</dd>
    </dl>
    <div class="clearit"></div>  </td>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%CC%AB%D4%AD&amp;dpc=1" target="_blank" class="fL">太原</a></dt>
     <dd class="dd1">晴</dd>
     <dd>10℃～-1℃</dd>
    </dl>
    <div class="clearit"></div>  </td>
 </tr>
 <tr>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%BA%F4%BA%CD%BA%C6%CC%D8&amp;dpc=1" target="_blank" class="fL">呼和浩特</a></dt>
     <dd class="dd1">晴</dd>
     <dd>6℃～-5℃</dd>
    </dl>
    <div class="clearit"></div>  </td>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%C7%D8%BB%CA%B5%BA&amp;dpc=1" target="_blank" class="fL">秦皇岛</a></dt>
     <dd class="dd1">阴转晴</dd>
     <dd>10℃～2℃</dd>
    </dl>
    <div class="clearit"></div>  </td>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%B4%F3%CD%AC&amp;dpc=1" target="_blank" class="fL">大同</a></dt>
     <dd class="dd1">晴</dd>
     <dd>3℃～-4℃</dd>
    </dl>
    <div class="clearit"></div>  </td> </tr>
</tbody></table>
</div>
<div style="display: none;" class="blkS3" id="data0_1">
    <table cellspacing="0" width="100%">
 <tbody><tr>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%C9%F2%D1%F4&amp;dpc=1" target="_blank" class="fL">沈阳</a></dt>
     <dd class="dd1">晴</dd>
     <dd>4℃～-7℃</dd>
    </dl>
    <div class="clearit"></div>
  </td>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%B4%F3%C1%AC&amp;dpc=1" target="_blank" class="fL">大连</a></dt>
     <dd class="dd1">雨夹雪转晴</dd>
     <dd>2℃～-1℃</dd>
    </dl>
    <div class="clearit"></div>
  </td>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%B0%B0%C9%BD&amp;dpc=1" target="_blank" class="fL">鞍山</a></dt>
     <dd class="dd1">晴</dd>
     <dd>4℃～-3℃</dd>
    </dl>
    <div class="clearit"></div>
  </td>
 </tr>
 <tr>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%B3%A4%B4%BA&amp;dpc=1" target="_blank" class="fL">长春</a></dt>
     <dd class="dd1">多云</dd>
     <dd>-1℃～-10℃</dd>
    </dl>
    <div class="clearit"></div>
  </td>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%BC%AA%C1%D6&amp;dpc=1" target="_blank" class="fL">吉林</a></dt>
     <dd class="dd1">多云</dd>
     <dd>-2℃～-9℃</dd>
    </dl>
    <div class="clearit"></div>
  </td>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%B9%FE%B6%FB%B1%F5&amp;dpc=1" target="_blank" class="fL">哈尔滨</a></dt>
     <dd class="dd1">晴</dd>
     <dd>-4℃～-11℃</dd>
    </dl>
    <div class="clearit"></div>
  </td>
 </tr>
 <tr>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%C6%EB%C6%EB%B9%FE%B6%FB&amp;dpc=1" target="_blank" class="fL">齐齐哈尔</a></dt>
     <dd class="dd1">晴转多云</dd>
     <dd>-3℃～-11℃</dd>
    </dl>
    <div class="clearit"></div>
  </td>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%B4%F3%C7%EC&amp;dpc=1" target="_blank" class="fL">大庆</a></dt>
     <dd class="dd1">多云</dd>
     <dd>-3℃～-11℃</dd>
    </dl>
    <div class="clearit"></div>
  </td>
  <td>
    <dl>
     <dt><a href="http://php.weather.sina.com.cn/search.php?city=%BC%D1%C4%BE%CB%B9&amp;dpc=1" target="_blank" class="fL">佳木斯</a></dt>
     <dd class="dd1">晴转阵雪</dd>
     <dd>-4℃～-12℃</dd>
    </dl>
    <div class="clearit"></div>
  </td> </tr>
</tbody></table>
</div>';
$str = strip_tags($str,"<d1>");
$m = preg_split("/[\s]+/",$str);
print_r($m);
?>

Answer 1

preg_match_all('/<a.+?target="_blank" class="fL">(.+?)<\/a>.*?<dd class="dd1">(.+?)<\/dd>.*?<dd>(.+?)<\/dd>/is',$a,$b);
print_r($b);$a就是你的内容

Answer 2

preg_match_all('/<dt><a[^<>]+>([^<>]+)<\/a><\/dt>\s+<dd class="dd1">([^<>]+)<\/dd>\s+<dd>([^<>]+)<\/dd>/isU',$str,$matches);
var_dump($matches);