php：html富文本提取text普通文本内容

<?php
function getPlainTextFromHtml($html)
{
    // Remove the HTML tags
    $html = strip_tags($html);
    // Convert HTML entities to single characters
    $html     = html_entity_decode($html, ENT_QUOTES, 'UTF-8');
    $html_len = mb_strlen($html, 'UTF-8');
    // Make the string the desired number of characters
    // Note that substr is not good as it counts by bytes and not characters
    $html = mb_substr($html, 0, strlen($html), 'UTF-8');
    return $html;
}
echo getPlainTextFromHtml('<p>主任医师，教授，<a>硕士生导师</a>，中山医学院医疗系毕业。<\/p>');
// 主任医师，教授，硕士生导师，中山医学院医疗系毕业。