Find what part of Html is invalid with PHP

Question

I tried several methods to find out what part of a html string is invalid

$dom->loadHTML($badHtml);
$tidy->cleanRepair();
simplexml_load_string($badHtml);

None is clear regarding what part of the html is invalid. Maybe and extra config option for one of the can fix that. Any ideas ?

I need this to manually fix html input from users. I don't want to relay on automated processes.

possible duplicate of [can i validate xhtml programmtically from a php script?](http://stackoverflow.com/questions/3714819/can-i-validate-xhtml-programmtically-from-a-php-script) — Gordon, Sep 15 '10 at 08:08
You might want to considering using W3C's source code. This was implemented for a project I once worked on - http://nibbler.silktide.com/ — Jake N, Sep 15 '10 at 08:10
You might want to specify what kind of output you expect from this function. — deceze, Sep 15 '10 at 08:27
I don't think it's a dup. I need to find the error not fix it. — johnlemon, Sep 15 '10 at 08:28

score 3 · Accepted Answer · answered Sep 15 '10 at 08:21

I'd try loading the offending HTML into a DOM Document (as you are already doing) and then using simplexml to fix things. You should be able to run a quick diff to see where the errors are.

error_reporting(0);

$badHTML = '<p>Some <em><strong>badly</em> nested</stong> tags</p>';

$doc = new DOMDocument();
$doc->encoding = 'UTF-8';

$doc->loadHTML($badHTML);

$goodHTML = simplexml_import_dom($doc)->asXML();

score 1 · Answer 2 · edited May 23 '17 at 12:08

1

You can compare cleaned and bad version with PHP Inline-Diff found in answer to that stackoverflow question.

edited May 23 '17 at 12:08

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answered Sep 15 '10 at 09:00

jcubic

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Is there an option to preserve html tags and show the difference between strings that have html ? – johnlemon Sep 15 '10 at 09:33
Maybe try use function `strip_tags` – jcubic Sep 15 '10 at 14:29

Find what part of Html is invalid with PHP

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