PHP get first paragraph from a string function

paragraphFunction.php

<?php 
    function getFirstPara($string){
        $string = substr($string,0, strpos($string, "</p>")+4);
        return $string;
    }
    
    // If you wanted to remove the paragraph tags from the HTML
    function getFirstPara2($string){
        $string = substr($string,0, strpos($string, "</p>")+4);
        $string = str_replace("<p>", "", str_replace("<p/>", "", $string));
        return $string;
    }
    // Then call the function, passing the string variable    
    echo getFirstPara($HTMLString);
?>

$html = '<p>Lorem ipsum dolor sit amet.</p>';
preg_match('/<p>(.*?)<\/p>/s', $html, $match);
and then
echo $match[0];