php 清除html格式

function stripHtmlTags($str) {
    return preg_replace('/<[^>]*>/', '', $str);
}

$htmlContent = "<p>Hello <b>World</b>!</p>";
$plainText = stripHtmlTags($htmlContent);
echo $plainText; // 输出: Hello World!

function stripHtmlTags($str) {
    $dom = new DOMDocument();
    @$dom->loadHTML($str);
    return $dom->textContent;
}

$htmlContent = "<p>Hello <b>World</b>!</p>";
$plainText = stripHtmlTags($htmlContent);
echo $plain_text; // 输出: Hello World!

require_once 'htmlpurifier/HTMLPurifier.auto.php';

$config = HTMLPurifier_Config::createDefault();
$purifier = new HTMLPurifier($config);
$htmlContent = "<p>Hello <b>World</b>!</p>";
$plainText = $purifier->purify($htmlContent);
echo $plainText; // 输出: Hello World!