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I checked the HTML validator. But, the message is the following.

Quote " in attribute name. Probable cause: Matching quote missing somewhere earlier.

The meta description is automatic from the content. So, if the content includes the quotation, it is also included in meta descrption. I would like to strip the quotation.

Currently, I inserted the code in header.php as below.

$description = strip_shortcodes($description); 
$description = wp_strip_all_tags($description);

What should I add?

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Try to use Yoast SEO: https://it.wordpress.org/plugins/wordpress-seo/

It's the best plugin for SEO in WP and should be strips all "dangerous" chars

  • Thank you for the info. But, at first, I'd like to try without plugin. Anyone else? – Yoos Oct 19 '18 at 9:16
  • In php you can use str_replace, for example: str_replace('"','',$metaDescription); or also use addslashes: php.net/manual/en/function.addslashes.php – ClodClod91 Oct 19 '18 at 9:25
  • Thank you for your reply, I tried $description = str_replace('"','',$description);, But, nothing changed. – Yoos Oct 19 '18 at 10:12
  • Moreover, I tried $description = htmlentities($description); code, the quotation was removed. But, it appeared " etc codes instead of the quotation.... – Yoos Oct 19 '18 at 10:18
  • See this: stackoverflow.com/questions/12111887/… – ClodClod91 Oct 19 '18 at 14:58
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Probably, it works for HTML5 Validator.

$description = str_replace(array("\r\n","\r","\n"," ",'"',"'"),'',$description);

$description = strip_shortcodes($description);

$description = wp_strip_all_tags($description);

First quotation is removed, but second one is not removed, though.

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