extract paragraphs from html string

<?php
function extractParagraphs($html)
{
    $paragraphs = array();
    $doc = new DOMDocument();
    libxml_use_internal_errors(true);
    $doc->loadHTML($html);
    libxml_clear_errors();
    foreach ($doc->getElementsByTagName('p') as $node)
    {
        $paragraphs[] = trim($node->nodeValue);
    }
    return $paragraphs;
}