PHP remove conditional comments which cause DOMXPath fail

https://stackoverflow.com/questions/18943426

PHP
conditional-comments
domxpath

29-06-2022
|

Domanda

conditional comments such as:

<!--[if lt IE 7 ]><!--> <html lang="hi" class="ie ie6"> <!--<![endif]-->

causes

$doc->loadHTML($content);   
$xpath = new DOMXPath($doc);

does not work properly. any prepared code to remove them?

Soluzione

If parsing the HTML doesn't work then you could use regular expressions, something like this example:

$str = "aa<!--[if lt IE 7 ]><!--> <html lang=\"hi\" class=\"ie ie6\"> <!--<![endif]-->bb cc";
$pattern = "/(<!--[if\s[lg]+t\sIE\s[0-9]+\s]><!-->)(.*)(<!--<!\[endif\]-->)/"; 
$str = preg_replace($pattern, '', $str);    
echo $str;

Or to keep the contents of the conditional tags:

$str = preg_replace($pattern, '$2', $str);
echo $str;

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