Check html syntax in string

Question

I can not find a solution.

How to check string with the html code.

example

<p><o:p></o:p></p> 
<p> <br /> </p> 
<p><b style=\"font-weight: bold;\"><b>Desc: </b>AnyText.</p> 
 <br /> </p> 
<p><b>Color:</b> green<
<p> <b>Param 2: AU55688</p> 
<p><b>Param 3: </b>420 x 562</p> 
<p><b>Height: </b>1425</p>

If there are unclosed tags or undiscovered, then return string if all is well, then skip.

I found and modified function. But it does not work properly

function closetag($html)
{
    $ignore_tags = array('img', 'br', 'hr');

    preg_match_all ( "#<([a-z]+)( .*)?(?!/)>#iU", mb_strtolower($html), $result1);
    preg_match_all ( "#</([a-z]+)>#iU", mb_strtolower($html), $result2);
    $results_start = $result1[1];
    $results_end = $result2[1];

    $result = array();
    foreach($results_start AS $startag)
    {
        if (!in_array($startag, $results_end) && !in_array($startag, $ignore_tags))
        {
            $result['start_tags'][] = $startag;
        }
    }
    foreach($results_end AS $endtag)
    {
        if (!in_array($endtag, $results_start) && !in_array($endtag, $ignore_tags))
        {
            $result['end_tags'][] = $endtag;
        }
    }

    return ($result) ? $result : false;
}

I do not need to correct the code, I need only determine that the syntax is not correct.

An example of what I want to get a result

$getTexts = $this->getTexts();

$no_valid = array();
foreach($getTexts AS $text)
{
    $_valid = check_html_systax_function($text);
    if (!$_valid)
    {
        $no_valid[] = $text;
    }
}

check_html_systax_function checks texts for correct html syntax

$no_valid array of texts in which errors in html syntax

PS Sorry for my English!

Answer 1

Do not use Regex to parse or validate HTML.

For PHP, there is the class DOMDocument . You can use this as follows:

$dom = new DOMDocument;
$dom->loadHTML($html);
if ($dom->validate()) {
    //valid HTML code
}

If you're looking for a library that offers more configurability and detailed error reporting, check HTMLpurifier .

Answer 2

You can check the following links for PHP HTML DOM parsers:

• PHP Simple HTML DOM Parser
• PHP-HTML-Parser

Answer 3

You can check html is valid or not by following code :

function closetags($html) {
    preg_match_all('#<(?!meta|img|br|hr|input\b)\b([a-z]+)(?: .*)?(?<![/|/ ])>#iU', $html, $result);
    $openedtags = $result[1];
    preg_match_all('#</([a-z]+)>#iU', $html, $result);
    $closedtags = $result[1];
    $len_opened = count($openedtags);
    if (count($closedtags) == $len_opened) {
        echo 'valid html'; 
    } else {
        echo 'invalid html';
    }
} 

$html = '<p>This is some text and here is a <strong>bold text then the post stop here....</p>';
closetags($html);

Answer 4

I've created method based on regex by Charvi .

It is available in text utilities: https://github.com/Alex-KOR/Text-utilities