php如何获取标签的值

PHP使用正则表达式获取指定标签的值：

//$html-被查找的字符串 $tag-被查找的标签 $attr-被查找的属性名 $value-被查找的属性值
function get_tag_data($html,$tag,$attr,$value){
$regex = "/<$tag.*?$attr=\".*?$value.*?\".*?>(.*?)<\/$tag>/is";
echo $regex."<br>";
preg_match_all($regex,$html,$matches,PREG_PATTERN_ORDER);
return $matches[1];
}
//返回值为数组 查找到的标签内的内容

示例

header("Content-type: text/html; charset=utf-8");
$temp = &#39;<ul class="noul clearfix">
<li class="w w0">
<a class="i i0 fc01 h" hidefocus="true" href="http://phpway.blog.163.com/">首页</a>
</li>
<li class="w w1 selected">
<a class="i i1 fc01 h" hidefocus="true" href="http://phpway.blog.163.com/blog/">日志</a>
</li>
<li class="w w9">
<a class="i i9 fc01 h" hidefocus="true" href="http://phpway.blog.163.com/loftarchive/">LOFTER</a>
</li>
<li class="w w2">
<a class="i i2 fc01 h" hidefocus="true" href="http://phpway.blog.163.com/album/">相册</a>
</li>
<li class="w w5">
<a class="i i5 fc01 h" hidefocus="true" href="http://phpway.blog.163.com/friends/">博友</a>
</li>
<li class="w w6">
<a class="i i6 fc01 h" hidefocus="true" href="http://phpway.blog.163.com/profile/">关于我</a>
</li>
</ul>&#39;;
$result = get_tag_data($temp,"a","class","fc01");
var_dump($result);

输出：

array(6) { [0]=> string(6) "首页" [1]=> string(6) "日志" [2]=> string(6) "LOFTER" [3]=> string(6) "相册" [4]=> string(6) "博友" [5]=> string(9) "关于我" }

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