HTML Online Validation via PHP DOMDocument Tutorial

HTML Online Validation via PHP DOMDocument Tutorial

The lack of platform functionality that yesterday’s HTML Online Validation via PHP Tidy Primer Tutorial “Intranet feeling” Online HTML Validator web application was supported by, got us interested in exploring HTML validation via PHP DOMDocument methodologies.

Yes, (serverside) PHP can work with (its version of) DOM (document object model) but not as well as (clientside) Javascript DOM can. The validation of HTML at the serverside (PHP) stage does not take into account web page rendering, and so struggles to detect “well formed looking” HTML (but) with HTML tags that mean nothing. But we can do some validation checking via …

<?php

function nodeContent($n, $outer=false) { // thanks to https://stackoverflow.com/questions/5404941/how-to-return-outer-html-of-domdocument
global $ioff, $origh;
$d = new DOMDocument();
$b = $d->importNode($n->cloneNode(true),true);
$d->appendChild($b);
$h = $d->saveHTML();
// remove outter tags
if (!$outer) {
$h = substr($h,strpos($h,'>')+1,-(strlen($n->nodeName)+4));
} else {
if ($ioff == -2 && strpos(strtolower($h), '<html') !== false) { return ''; }
if ($ioff <= -1 && strpos(strtolower($h), '<body') !== false) { return ''; }
}
if (stripos( str_replace(' ','',str_replace('"','',$origh)),str_replace(' ','',str_replace("\n",'',str_replace('"','',('' . $h)))) ) !== false) {
return '&#10004; ' . $h;
} else if (1 == 1) {
return '&#10060; ' . $h;
}
return '' . $h;
}

$doc = new DOMDocument();
$doc->loadHTML($htmlin);
foreach ($doc->getElementsByTagName("*") as $item) {
$elecnt++;
if ($rest == "") { $rest = " ... "; }
$rest.=' <br>' . str_replace('>','>',str_replace('<','<',nodeContent($item, true)));
}
$twc='Number of elements detected is ' . ($ioff + $elecnt) . $rest;

?>

The changed tidy_example.php‘s proof of concept PHP online HTML validator web application you can try here also, the mobile platform versions of which only allow the DOMDocument methodology be used.

Previous relevant HTML Online Validation via PHP Tidy Primer Tutorial is shown below.

HTML Online Validation via PHP Tidy Primer Tutorial

In terms of your, perhaps MAMP, Apache/PHP/MySql local web server’s “low hanging fruit” for extending PHP functionality, what are the most straightforward PHP modules to look at? We’d say …

1. find your Apache/PHP/MySql local web server’s php.ini (or equivalent) …
2. (text) edit this php.ini …
3. find “extension=” section and see those that are commented out …
4. these PHP modules will have been installed but held back from being activated …
5. you can then uncomment these …
6. File -> Save the new version of php.ini … then …
7. stop and start your Apache/PHP/MySql local web server

… and we found on our macOS Apache/PHP/MySql local web server the chance to introduce into our thinking, the use of the PHP module called “tidy”. Doing the research and development on this lead us to believe we could develop an “online HTML validator” (for small amounts of HTML on the RJM Programming domain version, initially), with tidy_example.php (which we’d want you to download to the document root folder of your, perhaps MAMP, Apache/PHP/MySql local web server, to enable our “Intranet” feeling modus operandi up at the RJM Programming public domain) proof of concept PHP online HTML validator web application …

If this was interesting you may be interested in this too.

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