PHP函数使用preg_replace替换HTML标记（例如元描述） [英] PHP function to replace a HTML tag (e.g. meta description) using preg_replace

问题描述

有人可以帮我获得这个功能吗？该函数应该接受 $ HTMLstr - 整个HTML页面填充到已包含元描述的字符串中：

 < meta name =descriptioncontent =This will be replaced/> 
  

以及 $ content 这是字符串应该取代这将被取代。

 函数HTML_set_meta_description（$ HTMLstr，$ content）这个函数的功能非常接近，但它不起作用。 {
 $ newHTML = preg_replace（'/< meta name =description（。*）\ /> / is'，'< meta name = \description \content = \\ （$ newHTML）; 
} 
  

$

感谢您的帮助！

编辑：这里是工作函数。

 函数HTML_set_meta_description（$ HTMLstr，$ content）{
 //假设meta格式正好< meta name =descriptioncontent =This will be replaced/> ; 
 $ newHTML = preg_replace（'/< meta name =descriptioncontent =（。*）\ /> / i'，'< meta name =descriptioncontent =' $ content。'/>'，$ HTMLstr）; 
 return（$ newHTML）; 
  

}

解决方案使用 DOMDocument 被推荐为alre如果你正在用正则表达式挣扎，那么我可能会帮你解决问题。您可以试试这个：

  return preg_replace（'/< meta name =descriptioncontent =（。*） \ /> / i'，'< meta name =descriptioncontent =Something replaced/>'，$ HTMLstr）; 
  

Can someone help me get this function to work? The function should accept $HTMLstr -- a whole page of HTML stuffed into a string that already contains a meta description in the form of:

<meta name="description" content="This will be replaced"/>

along with $content which is the string that should replace "This will be replaced". I thought I was close with this function, but it doesn't quite work.

function HTML_set_meta_description ($HTMLstr, $content) {
$newHTML = preg_replace('/<meta name="description"(.*)"\/>/is', "<meta name=\"description\" content=\"$content\"/>", $HTMLstr);
return ($newHTML);
}

Thanks for any help!

Edit: Here's the working function.

function HTML_set_meta_description ($HTMLstr, $content) {
// assumes meta format is exactly <meta name="description" content="This will be replaced"/>
$newHTML = preg_replace('/<meta name="description" content="(.*)"\/>/i','<meta name="description" content="' . $content . '" />', $HTMLstr);
return ($newHTML);

}

解决方案

Using DOMDocument is recommended as already an answer, however if you're struggling with a regular expression, then I might help you out. You might try this instead:

return preg_replace('/<meta name="description" content="(.*)"\/>/i','<meta name="description" content="Something replaced" />', $HTMLstr);

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