如何使用HTML简单dom获得Content-type？ [英] How to get Content-type using html simple dom?

问题描述

我尝试了 find（'meta [http-equiv = Content-type]'），但未能检索到该信息。

I tried find('meta[http-equiv="Content-type"]') but it failed to retrieve that information.

推荐答案

SimpleHTMLDom在选择器中不使用带引号的字符串文字。只是 elem [attr = value] 。而且 value 的比较似乎区分大小写（可能有一种使其不区分大小写的方法，但我不知道）*

SimpleHTMLDom doesn't use quoted string literals in the selector. It's just elem[attr=value]. And the comparison of value seems to be case-sensitive (there may be a way to make it case-insensitive, but that I don't know)*

例如

require 'simple_html_dom.php';
$html = file_get_html('http://www.google.com/');
// most likely one one element but foreach doesn't hurt
foreach( $html->find('meta[http-equiv=content-type]') as $ct ) { 
  echo $ct->content, "\n";
}

打印 text / html; charset = ISO-8859-1 。

*编辑：是的，有一种方法可以执行不区分大小写的匹配，请使用 * = 而不是 =

*edit: yes, there is a way to perform a case-insensitive match, use *= instead of =

find('meta[http-equiv*=content-type]')

edit2：顺便说一句， http-equiv * =内容类型也会匹配< meta http-equiv = haha​​-no-content-types。 .. （它仅测试字符串是否在属性值中的某个位置）。但这是我唯一找到的不区分大小写的功能/运算符。我猜您可以在这种情况下使用它；-）

编辑3：它使用preg_match（’... / i’），并且模式/选择器直接传递给该函数。因此，您可以执行类似 http-equiv * = ^ content-type $ 的操作来匹配 http-equiv = Content类型 ，而不是 http-equiv = xyzContent-typeabc 。但是我不知道这是否是必要功能。

edit2: btw that http-equiv*=content-type thingy would also match <meta http-equiv="haha-no-content-types"... (it only tests if the string is somewhere in the attribute's value). But it's the only case-insensitive function/operator I could find. I guess you can live with it in this case ;-)
edit 3: It uses preg_match('.../i') and the pattern/selector is directly passed to that function. Therefore you could do something like http-equiv*=^content-type$ to match http-equiv="Content-type" but not http-equiv="xyzContent-typeabc". But I don't know if this is a warranted feature.

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