PHP

php parse html

$dom = new DOMDocument();
$dom->loadHTMLFile('path/to/htmlfile.html');    // or loadHTML($str)
$dom->load('path/to/xmlfile.xml');              // or loadXML($str)

$table = $dom->getElementById('mytable-id');    // DOMElement
$lines = $table->getElementsByTagName('tr');    // DOMNodeList
$links = $dom->getElementsByTagName('a');

$xpath = new DOMXpath($dom);
$tables = $xpath->query("//table[contains(@class,'mytables-class')]");

parsing HTML in php

<?php

require_once('simple_html_dom.php');

function getByClass($element, $class)
{
    $content= [];

    $html = 'index.html';

    $html_string = file_get_contents($html);

    $html = str_get_html($html_string);

    foreach ($html->find($element) as $element) {
        if ($element->class === $class) {
            array_push($heading, $element->innertext);
        }
    }

    print_r($content);
}

getByClass("h2", "main");
getByClass("p", "special");